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iterator.seekToFirst() high latency · Issue #261 · facebook/rocksdb · GitHub
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class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Resources <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="resources-topics-heading">Topics</span> <ul class="list-style-none f5" 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class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 px-lg-4"> <div class="HeaderMenu-column"> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"github_sponsors","context":"open_source","tag":"link","label":"github_sponsors_link_open_source_navbar"}" href="/sponsors"> <div> <div class="color-fg-default h4">GitHub Sponsors</div> Fund open source developers </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" 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--></option></form><form id="code-search-feedback-form" data-turbo="false" action="/search/feedback" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="A4xp7m/mJC4Mw4ke3EN8b5399OudT3I4LIVlV+q3kLJSrnNCGcxPQ9sWuPeeqd2q1Y/XWVqmtPAucfbiBevjZA==" /> <p>We read every piece of feedback, and take your input very seriously.</p> <textarea name="feedback" class="form-control width-full mb-2" style="height: 120px" id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button 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data-octo-dimensions="link_type:self" href="/nav568">nav568</a> opened this issue <relative-time datetime="2014-09-03T23:45:54Z" class="no-wrap">Sep 3, 2014</relative-time> · 11 comments <span data-issue-and-pr-hovercards-enabled> </span> </div> </div> <div class="js-sticky js-sticky-offset-scroll top-0 gh-header-sticky"> <div class="sticky-content"> <div class="d-flex flex-items-center flex-justify-between mt-2"> <div class="d-flex flex-row flex-items-center min-width-0"> <div class="mr-2 mb-2 flex-shrink-0"> <span title="Status: Closed" data-view-component="true" class="State State--merged d-flex flex-items-center"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-issue-closed flex-items-center mr-1"> <path d="M11.28 6.78a.75.75 0 0 0-1.06-1.06L7.25 8.69 5.78 7.22a.75.75 0 0 0-1.06 1.06l2 2a.75.75 0 0 0 1.06 0l3.5-3.5Z"></path><path d="M16 8A8 8 0 1 1 0 8a8 8 0 0 1 16 0Zm-1.5 0a6.5 6.5 0 1 0-13 0 6.5 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class="js-quote-selection-container" data-quote-markdown=".js-comment-body" data-discussion-hovercards-enabled data-issue-and-pr-hovercards-enabled data-team-hovercards-enabled> <div class="js-discussion ml-0 pl-0 ml-md-6 pl-md-3" data-hpc > <div class="TimelineItem pt-0 js-comment-container js-socket-channel js-updatable-content " data-gid="MDU6SXNzdWU0MTg4MDc1MQ==" data-url="/facebook/rocksdb/issues/261/partials/body?issue=261" data-channel="eyJjIjoiaXNzdWU6NDE4ODA3NTEiLCJ0IjoxNzMzMTUyMjI4fQ==--b972146351cdab186d3d1540496622580f1116f22fb88ff81bb276f641f772f3"> <div class="avatar-parent-child TimelineItem-avatar d-none d-md-block"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/nav568/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/nav568"><img class="avatar rounded-2 avatar-user" src="https://avatars.githubusercontent.com/u/1060611?s=80&u=083b4a1a31cee8e9f8e1c79a53cb5d5b3a9eb5c1&v=4" width="40" 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href="/nav568">nav568</a> </strong> commented <a href="#issue-41880751" id="issue-41880751-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2014-09-03T23:45:54Z" class="no-wrap">Sep 3, 2014</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">Hey all,<br> I am using RocksDB iterator to seek to beginning and then perform some deletes (around 32 deletes/second). The behavior we are noticing is that the seek call takes about a second to return and takes up almost all of the CPU.</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="org.apache.samza.storage.kv.RocksDbKeyValueStore.all() 96.95% org.rocksdb.RocksIterator.seekToFirst() 96.95% org.rocksdb.RocksIterator.seekToFirst0[native]() 96.95%"><pre class="notranslate"><code class="notranslate">org.apache.samza.storage.kv.RocksDbKeyValueStore.all() 96.95% org.rocksdb.RocksIterator.seekToFirst() 96.95% org.rocksdb.RocksIterator.seekToFirst0[native]() 96.95% </code></pre></div> <p dir="auto">We observed the iostats and we do not see any heavy IO operation being performed. We keep doing this operation repeatedly (for testing purposes), initially it doesn't take that long (takes about 100ms), but slowly creeps up and stays at 1s for a long time. When it hits this 1s threshold, RocksDB doesn't print any logs after this (nothing for 8 hours sometimes).<br> <a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/1060611/4143045/08057686-33c3-11e4-93ff-52c5f3494232.png"><img src="https://cloud.githubusercontent.com/assets/1060611/4143045/08057686-33c3-11e4-93ff-52c5f3494232.png" alt="screen shot 2014-09-03 at 4 34 18 pm" style="max-width: 100%;"></a></p> <p dir="auto">The first graph is the number of key-value pairs and the second graph is the time it takes to seek to the beginning.</p> <p dir="auto">Can someone please explain this behavior ? Why would it take the iterator that long to seek to beginning ? Why do the logs start disappearing ?</p> <p dir="auto">Configuration:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="2014/09/03-19:13:45.914404 7fb7b61dc700 Options.error_if_exists: 1 2014/09/03-19:13:45.914408 7fb7b61dc700 Options.create_if_missing: 1 2014/09/03-19:13:45.914410 7fb7b61dc700 Options.paranoid_checks: 1 2014/09/03-19:13:45.914411 7fb7b61dc700 Options.env: 0x7fb78f7cf340 2014/09/03-19:13:45.914413 7fb7b61dc700 Options.info_log: 0x7fb7b14696d0 2014/09/03-19:13:45.914414 7fb7b61dc700 Options.max_open_files: 5000 2014/09/03-19:13:45.914416 7fb7b61dc700 Options.max_total_wal_size: 0 2014/09/03-19:13:45.914418 7fb7b61dc700 Options.disableDataSync: 0 2014/09/03-19:13:45.914419 7fb7b61dc700 Options.use_fsync: 0 2014/09/03-19:13:45.914421 7fb7b61dc700 Options.max_log_file_size: 0 2014/09/03-19:13:45.914422 7fb7b61dc700 Options.max_manifest_file_size: 18446744073709551615 2014/09/03-19:13:45.914424 7fb7b61dc700 Options.log_file_time_to_roll: 0 2014/09/03-19:13:45.914425 7fb7b61dc700 Options.keep_log_file_num: 1000 2014/09/03-19:13:45.914427 7fb7b61dc700 Options.allow_os_buffer: 1 2014/09/03-19:13:45.914435 7fb7b61dc700 Options.allow_mmap_reads: 0 2014/09/03-19:13:45.914436 7fb7b61dc700 Options.allow_mmap_writes: 0 2014/09/03-19:13:45.914438 7fb7b61dc700 Options.create_missing_column_families: 0 2014/09/03-19:13:45.914439 7fb7b61dc700 Options.db_log_dir: 2014/09/03-19:13:45.914441 7fb7b61dc700 Options.wal_dir: /Partition 12 2014/09/03-19:13:45.914443 7fb7b61dc700 Options.table_cache_numshardbits: 4 2014/09/03-19:13:45.914445 7fb7b61dc700 Options.table_cache_remove_scan_count_limit: 16 2014/09/03-19:13:45.914446 7fb7b61dc700 Options.delete_obsolete_files_period_micros: 21600000000 2014/09/03-19:13:45.914448 7fb7b61dc700 Options.max_background_compactions: 1 2014/09/03-19:13:45.914450 7fb7b61dc700 Options.max_background_flushes: 1 2014/09/03-19:13:45.914451 7fb7b61dc700 Options.WAL_ttl_seconds: 0 2014/09/03-19:13:45.914453 7fb7b61dc700 Options.WAL_size_limit_MB: 0 2014/09/03-19:13:45.914454 7fb7b61dc700 Options.manifest_preallocation_size: 4194304 2014/09/03-19:13:45.914456 7fb7b61dc700 Options.allow_os_buffer: 1 2014/09/03-19:13:45.914458 7fb7b61dc700 Options.allow_mmap_reads: 0 2014/09/03-19:13:45.914459 7fb7b61dc700 Options.allow_mmap_writes: 0 2014/09/03-19:13:45.914461 7fb7b61dc700 Options.is_fd_close_on_exec: 1 2014/09/03-19:13:45.914462 7fb7b61dc700 Options.skip_log_error_on_recovery: 0 2014/09/03-19:13:45.914464 7fb7b61dc700 Options.stats_dump_period_sec: 3600 2014/09/03-19:13:45.914465 7fb7b61dc700 Options.advise_random_on_open: 1 2014/09/03-19:13:45.914467 7fb7b61dc700 Options.access_hint_on_compaction_start: NORMAL 2014/09/03-19:13:45.914468 7fb7b61dc700 Options.use_adaptive_mutex: 0 2014/09/03-19:13:45.914470 7fb7b61dc700 Options.bytes_per_sync: 0 2014/09/03-19:13:45.914614 7fb7b61dc700 Creating manifest 1 2014/09/03-19:13:48.241838 7fb7b61dc700 Recovering from manifest file: MANIFEST-000001 2014/09/03-19:13:48.241928 7fb7b61dc700 Options for column family "default": 2014/09/03-19:13:48.241936 7fb7b61dc700 Options.comparator: rocksdb.InternalKeyComparator:leveldb.BytewiseComparator 2014/09/03-19:13:48.241939 7fb7b61dc700 Options.merge_operator: None 2014/09/03-19:13:48.241941 7fb7b61dc700 Options.compaction_filter_factory: DefaultCompactionFilterFactory 2014/09/03-19:13:48.241944 7fb7b61dc700 Options.compaction_filter_factory_v2: DefaultCompactionFilterFactoryV2 2014/09/03-19:13:48.241945 7fb7b61dc700 Options.memtable_factory: SkipListFactory 2014/09/03-19:13:48.241947 7fb7b61dc700 Options.table_factory: BlockBasedTable 2014/09/03-19:13:48.241949 7fb7b61dc700 Options.write_buffer_size: 67108864 2014/09/03-19:13:48.241951 7fb7b61dc700 Options.max_write_buffer_number: 3 2014/09/03-19:13:48.241953 7fb7b61dc700 Options.block_cache: 0x7fb7b1467758 2014/09/03-19:13:48.241955 7fb7b61dc700 Options.block_cache_compressed: (nil) 2014/09/03-19:13:48.241957 7fb7b61dc700 Options.block_cache_size: 134217728 2014/09/03-19:13:48.241959 7fb7b61dc700 Options.block_size: 4096 2014/09/03-19:13:48.241961 7fb7b61dc700 Options.block_restart_interval: 16 2014/09/03-19:13:48.241963 7fb7b61dc700 Options.compression: 1 2014/09/03-19:13:48.241965 7fb7b61dc700 Options.filter_policy: rocksdb.BuiltinBloomFilter 2014/09/03-19:13:48.241967 7fb7b61dc700 Options.prefix_extractor: nullptr 2014/09/03-19:13:48.241968 7fb7b61dc700 Options.whole_key_filtering: 1 2014/09/03-19:13:48.241970 7fb7b61dc700 Options.num_levels: 7 2014/09/03-19:13:48.241972 7fb7b61dc700 Options.min_write_buffer_number_to_merge: 1 2014/09/03-19:13:48.241974 7fb7b61dc700 Options.purge_redundant_kvs_while_flush: 1 2014/09/03-19:13:48.241975 7fb7b61dc700 Options.compression_opts.window_bits: -14 2014/09/03-19:13:48.241977 7fb7b61dc700 Options.compression_opts.level: -1 2014/09/03-19:13:48.241979 7fb7b61dc700 Options.compression_opts.strategy: 0 2014/09/03-19:13:48.241980 7fb7b61dc700 Options.level0_file_num_compaction_trigger: 4 2014/09/03-19:13:48.241982 7fb7b61dc700 Options.level0_slowdown_writes_trigger: 20 2014/09/03-19:13:48.241984 7fb7b61dc700 Options.level0_stop_writes_trigger: 24 2014/09/03-19:13:48.241986 7fb7b61dc700 Options.max_mem_compaction_level: 2 2014/09/03-19:13:48.241987 7fb7b61dc700 Options.target_file_size_base: 2097152 2014/09/03-19:13:48.241989 7fb7b61dc700 Options.target_file_size_multiplier: 1 2014/09/03-19:13:48.241991 7fb7b61dc700 Options.max_bytes_for_level_base: 10485760 2014/09/03-19:13:48.241992 7fb7b61dc700 Options.max_bytes_for_level_multiplier: 10 2014/09/03-19:13:48.241992 7fb7b61dc700 Options.max_bytes_for_level_multiplier: 10 2014/09/03-19:13:48.241994 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[0]: 1 2014/09/03-19:13:48.241996 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[1]: 1 2014/09/03-19:13:48.241998 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[2]: 1 2014/09/03-19:13:48.242000 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[3]: 1 2014/09/03-19:13:48.242001 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[4]: 1 2014/09/03-19:13:48.242003 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[5]: 1 2014/09/03-19:13:48.242005 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[6]: 1 2014/09/03-19:13:48.242006 7fb7b61dc700 Options.max_sequential_skip_in_iterations: 8 2014/09/03-19:13:48.242008 7fb7b61dc700 Options.expanded_compaction_factor: 25 2014/09/03-19:13:48.242010 7fb7b61dc700 Options.source_compaction_factor: 1 2014/09/03-19:13:48.242012 7fb7b61dc700 Options.max_grandparent_overlap_factor: 10 2014/09/03-19:13:48.242013 7fb7b61dc700 Options.no_block_cache: 0 2014/09/03-19:13:48.242035 7fb7b61dc700 Options.arena_block_size: 6710886 2014/09/03-19:13:48.242038 7fb7b61dc700 Options.soft_rate_limit: 0.00 2014/09/03-19:13:48.242044 7fb7b61dc700 Options.hard_rate_limit: 0.00 2014/09/03-19:13:48.242047 7fb7b61dc700 Options.rate_limit_delay_max_milliseconds: 1000 2014/09/03-19:13:48.242048 7fb7b61dc700 Options.disable_auto_compactions: 0 2014/09/03-19:13:48.242050 7fb7b61dc700 Options.purge_redundant_kvs_while_flush: 1 2014/09/03-19:13:48.242052 7fb7b61dc700 Options.block_size_deviation: 10 2014/09/03-19:13:48.242053 7fb7b61dc700 Options.filter_deletes: 0 2014/09/03-19:13:48.242055 7fb7b61dc700 Options.verify_checksums_in_compaction: 1 2014/09/03-19:13:48.242057 7fb7b61dc700 Options.compaction_style: 1 2014/09/03-19:13:48.242058 7fb7b61dc700 Options.compaction_options_universal.size_ratio: 1 2014/09/03-19:13:48.242060 7fb7b61dc700 Options.compaction_options_universal.min_merge_width: 2 2014/09/03-19:13:48.242061 7fb7b61dc700 Options.compaction_options_universal.max_merge_width: 4294967295 2014/09/03-19:13:48.242063 7fb7b61dc700 Options.compaction_options_universal.max_size_amplification_percent: 200 2014/09/03-19:13:48.242065 7fb7b61dc700 Options.compaction_options_universal.compression_size_percent: 4294967295 2014/09/03-19:13:48.242066 7fb7b61dc700 Options.compaction_options_fifo.max_table_files_size: 1073741824 2014/09/03-19:13:48.242070 7fb7b61dc700 Options.table_properties_collectors: InternalKeyPropertiesCollectorFactory; 2014/09/03-19:13:48.242072 7fb7b61dc700 Options.inplace_update_support: 0 2014/09/03-19:13:48.242073 7fb7b61dc700 Options.inplace_update_num_locks: 10000 2014/09/03-19:13:48.242075 7fb7b61dc700 Options.min_partial_merge_operands: 2 2014/09/03-19:13:48.242076 7fb7b61dc700 Options.memtable_prefix_bloom_bits: 0 2014/09/03-19:13:48.242078 7fb7b61dc700 Options.memtable_prefix_bloom_probes: 6 2014/09/03-19:13:48.242079 7fb7b61dc700 Options.memtable_prefix_bloom_huge_page_tlb_size: 0 2014/09/03-19:13:48.242081 7fb7b61dc700 Options.bloom_locality: 0 2014/09/03-19:13:48.242082 7fb7b61dc700 Options.max_successive_merges: 0"><pre class="notranslate"><code class="notranslate">2014/09/03-19:13:45.914404 7fb7b61dc700 Options.error_if_exists: 1 2014/09/03-19:13:45.914408 7fb7b61dc700 Options.create_if_missing: 1 2014/09/03-19:13:45.914410 7fb7b61dc700 Options.paranoid_checks: 1 2014/09/03-19:13:45.914411 7fb7b61dc700 Options.env: 0x7fb78f7cf340 2014/09/03-19:13:45.914413 7fb7b61dc700 Options.info_log: 0x7fb7b14696d0 2014/09/03-19:13:45.914414 7fb7b61dc700 Options.max_open_files: 5000 2014/09/03-19:13:45.914416 7fb7b61dc700 Options.max_total_wal_size: 0 2014/09/03-19:13:45.914418 7fb7b61dc700 Options.disableDataSync: 0 2014/09/03-19:13:45.914419 7fb7b61dc700 Options.use_fsync: 0 2014/09/03-19:13:45.914421 7fb7b61dc700 Options.max_log_file_size: 0 2014/09/03-19:13:45.914422 7fb7b61dc700 Options.max_manifest_file_size: 18446744073709551615 2014/09/03-19:13:45.914424 7fb7b61dc700 Options.log_file_time_to_roll: 0 2014/09/03-19:13:45.914425 7fb7b61dc700 Options.keep_log_file_num: 1000 2014/09/03-19:13:45.914427 7fb7b61dc700 Options.allow_os_buffer: 1 2014/09/03-19:13:45.914435 7fb7b61dc700 Options.allow_mmap_reads: 0 2014/09/03-19:13:45.914436 7fb7b61dc700 Options.allow_mmap_writes: 0 2014/09/03-19:13:45.914438 7fb7b61dc700 Options.create_missing_column_families: 0 2014/09/03-19:13:45.914439 7fb7b61dc700 Options.db_log_dir: 2014/09/03-19:13:45.914441 7fb7b61dc700 Options.wal_dir: /Partition 12 2014/09/03-19:13:45.914443 7fb7b61dc700 Options.table_cache_numshardbits: 4 2014/09/03-19:13:45.914445 7fb7b61dc700 Options.table_cache_remove_scan_count_limit: 16 2014/09/03-19:13:45.914446 7fb7b61dc700 Options.delete_obsolete_files_period_micros: 21600000000 2014/09/03-19:13:45.914448 7fb7b61dc700 Options.max_background_compactions: 1 2014/09/03-19:13:45.914450 7fb7b61dc700 Options.max_background_flushes: 1 2014/09/03-19:13:45.914451 7fb7b61dc700 Options.WAL_ttl_seconds: 0 2014/09/03-19:13:45.914453 7fb7b61dc700 Options.WAL_size_limit_MB: 0 2014/09/03-19:13:45.914454 7fb7b61dc700 Options.manifest_preallocation_size: 4194304 2014/09/03-19:13:45.914456 7fb7b61dc700 Options.allow_os_buffer: 1 2014/09/03-19:13:45.914458 7fb7b61dc700 Options.allow_mmap_reads: 0 2014/09/03-19:13:45.914459 7fb7b61dc700 Options.allow_mmap_writes: 0 2014/09/03-19:13:45.914461 7fb7b61dc700 Options.is_fd_close_on_exec: 1 2014/09/03-19:13:45.914462 7fb7b61dc700 Options.skip_log_error_on_recovery: 0 2014/09/03-19:13:45.914464 7fb7b61dc700 Options.stats_dump_period_sec: 3600 2014/09/03-19:13:45.914465 7fb7b61dc700 Options.advise_random_on_open: 1 2014/09/03-19:13:45.914467 7fb7b61dc700 Options.access_hint_on_compaction_start: NORMAL 2014/09/03-19:13:45.914468 7fb7b61dc700 Options.use_adaptive_mutex: 0 2014/09/03-19:13:45.914470 7fb7b61dc700 Options.bytes_per_sync: 0 2014/09/03-19:13:45.914614 7fb7b61dc700 Creating manifest 1 2014/09/03-19:13:48.241838 7fb7b61dc700 Recovering from manifest file: MANIFEST-000001 2014/09/03-19:13:48.241928 7fb7b61dc700 Options for column family "default": 2014/09/03-19:13:48.241936 7fb7b61dc700 Options.comparator: rocksdb.InternalKeyComparator:leveldb.BytewiseComparator 2014/09/03-19:13:48.241939 7fb7b61dc700 Options.merge_operator: None 2014/09/03-19:13:48.241941 7fb7b61dc700 Options.compaction_filter_factory: DefaultCompactionFilterFactory 2014/09/03-19:13:48.241944 7fb7b61dc700 Options.compaction_filter_factory_v2: DefaultCompactionFilterFactoryV2 2014/09/03-19:13:48.241945 7fb7b61dc700 Options.memtable_factory: SkipListFactory 2014/09/03-19:13:48.241947 7fb7b61dc700 Options.table_factory: BlockBasedTable 2014/09/03-19:13:48.241949 7fb7b61dc700 Options.write_buffer_size: 67108864 2014/09/03-19:13:48.241951 7fb7b61dc700 Options.max_write_buffer_number: 3 2014/09/03-19:13:48.241953 7fb7b61dc700 Options.block_cache: 0x7fb7b1467758 2014/09/03-19:13:48.241955 7fb7b61dc700 Options.block_cache_compressed: (nil) 2014/09/03-19:13:48.241957 7fb7b61dc700 Options.block_cache_size: 134217728 2014/09/03-19:13:48.241959 7fb7b61dc700 Options.block_size: 4096 2014/09/03-19:13:48.241961 7fb7b61dc700 Options.block_restart_interval: 16 2014/09/03-19:13:48.241963 7fb7b61dc700 Options.compression: 1 2014/09/03-19:13:48.241965 7fb7b61dc700 Options.filter_policy: rocksdb.BuiltinBloomFilter 2014/09/03-19:13:48.241967 7fb7b61dc700 Options.prefix_extractor: nullptr 2014/09/03-19:13:48.241968 7fb7b61dc700 Options.whole_key_filtering: 1 2014/09/03-19:13:48.241970 7fb7b61dc700 Options.num_levels: 7 2014/09/03-19:13:48.241972 7fb7b61dc700 Options.min_write_buffer_number_to_merge: 1 2014/09/03-19:13:48.241974 7fb7b61dc700 Options.purge_redundant_kvs_while_flush: 1 2014/09/03-19:13:48.241975 7fb7b61dc700 Options.compression_opts.window_bits: -14 2014/09/03-19:13:48.241977 7fb7b61dc700 Options.compression_opts.level: -1 2014/09/03-19:13:48.241979 7fb7b61dc700 Options.compression_opts.strategy: 0 2014/09/03-19:13:48.241980 7fb7b61dc700 Options.level0_file_num_compaction_trigger: 4 2014/09/03-19:13:48.241982 7fb7b61dc700 Options.level0_slowdown_writes_trigger: 20 2014/09/03-19:13:48.241984 7fb7b61dc700 Options.level0_stop_writes_trigger: 24 2014/09/03-19:13:48.241986 7fb7b61dc700 Options.max_mem_compaction_level: 2 2014/09/03-19:13:48.241987 7fb7b61dc700 Options.target_file_size_base: 2097152 2014/09/03-19:13:48.241989 7fb7b61dc700 Options.target_file_size_multiplier: 1 2014/09/03-19:13:48.241991 7fb7b61dc700 Options.max_bytes_for_level_base: 10485760 2014/09/03-19:13:48.241992 7fb7b61dc700 Options.max_bytes_for_level_multiplier: 10 2014/09/03-19:13:48.241992 7fb7b61dc700 Options.max_bytes_for_level_multiplier: 10 2014/09/03-19:13:48.241994 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[0]: 1 2014/09/03-19:13:48.241996 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[1]: 1 2014/09/03-19:13:48.241998 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[2]: 1 2014/09/03-19:13:48.242000 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[3]: 1 2014/09/03-19:13:48.242001 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[4]: 1 2014/09/03-19:13:48.242003 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[5]: 1 2014/09/03-19:13:48.242005 7fb7b61dc700 Options.max_bytes_for_level_multiplier_addtl[6]: 1 2014/09/03-19:13:48.242006 7fb7b61dc700 Options.max_sequential_skip_in_iterations: 8 2014/09/03-19:13:48.242008 7fb7b61dc700 Options.expanded_compaction_factor: 25 2014/09/03-19:13:48.242010 7fb7b61dc700 Options.source_compaction_factor: 1 2014/09/03-19:13:48.242012 7fb7b61dc700 Options.max_grandparent_overlap_factor: 10 2014/09/03-19:13:48.242013 7fb7b61dc700 Options.no_block_cache: 0 2014/09/03-19:13:48.242035 7fb7b61dc700 Options.arena_block_size: 6710886 2014/09/03-19:13:48.242038 7fb7b61dc700 Options.soft_rate_limit: 0.00 2014/09/03-19:13:48.242044 7fb7b61dc700 Options.hard_rate_limit: 0.00 2014/09/03-19:13:48.242047 7fb7b61dc700 Options.rate_limit_delay_max_milliseconds: 1000 2014/09/03-19:13:48.242048 7fb7b61dc700 Options.disable_auto_compactions: 0 2014/09/03-19:13:48.242050 7fb7b61dc700 Options.purge_redundant_kvs_while_flush: 1 2014/09/03-19:13:48.242052 7fb7b61dc700 Options.block_size_deviation: 10 2014/09/03-19:13:48.242053 7fb7b61dc700 Options.filter_deletes: 0 2014/09/03-19:13:48.242055 7fb7b61dc700 Options.verify_checksums_in_compaction: 1 2014/09/03-19:13:48.242057 7fb7b61dc700 Options.compaction_style: 1 2014/09/03-19:13:48.242058 7fb7b61dc700 Options.compaction_options_universal.size_ratio: 1 2014/09/03-19:13:48.242060 7fb7b61dc700 Options.compaction_options_universal.min_merge_width: 2 2014/09/03-19:13:48.242061 7fb7b61dc700 Options.compaction_options_universal.max_merge_width: 4294967295 2014/09/03-19:13:48.242063 7fb7b61dc700 Options.compaction_options_universal.max_size_amplification_percent: 200 2014/09/03-19:13:48.242065 7fb7b61dc700 Options.compaction_options_universal.compression_size_percent: 4294967295 2014/09/03-19:13:48.242066 7fb7b61dc700 Options.compaction_options_fifo.max_table_files_size: 1073741824 2014/09/03-19:13:48.242070 7fb7b61dc700 Options.table_properties_collectors: InternalKeyPropertiesCollectorFactory; 2014/09/03-19:13:48.242072 7fb7b61dc700 Options.inplace_update_support: 0 2014/09/03-19:13:48.242073 7fb7b61dc700 Options.inplace_update_num_locks: 10000 2014/09/03-19:13:48.242075 7fb7b61dc700 Options.min_partial_merge_operands: 2 2014/09/03-19:13:48.242076 7fb7b61dc700 Options.memtable_prefix_bloom_bits: 0 2014/09/03-19:13:48.242078 7fb7b61dc700 Options.memtable_prefix_bloom_probes: 6 2014/09/03-19:13:48.242079 7fb7b61dc700 Options.memtable_prefix_bloom_huge_page_tlb_size: 0 2014/09/03-19:13:48.242081 7fb7b61dc700 Options.bloom_locality: 0 2014/09/03-19:13:48.242082 7fb7b61dc700 Options.max_successive_merges: 0 </code></pre></div> <p dir="auto">The last few minutes before RocksDB stops printing log:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="2014/09/03-20:46:31.916208 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916168) [default] Universal: Possible candidate file 353[0]. 2014/09/03-20:46:31.916209 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916169) [default] Universal: Skipping file 353[0] with size 45765666 (compensated size 70532946) 0 2014/09/03-20:46:31.916210 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916170) [default] Universal: Possible candidate file 351[1]. 2014/09/03-20:46:31.916212 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916170) [default] Universal: Skipping file 351[1] with size 274767888 (compensated size 408189024) 0 2014/09/03-20:46:31.916213 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916171) [default] Universal: Possible candidate file 334[2]. 2014/09/03-20:46:31.916215 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916173) [default] Universal: Skipping file 334[2] with size 735666259 (compensated size 738294227) 0 2014/09/03-20:46:31.916216 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916173) [default] Universal: Possible candidate file 300[3]. 2014/09/03-20:46:31.916217 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916174) [default] Universal: Skipping file 300[3] with size 782344698 (compensated size 785612346) 0 2014/09/03-20:46:31.916219 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916175) [default] Universal: Possible candidate file 252[4]. 2014/09/03-20:46:31.916220 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916175) [default] Universal: Skipping file 252[4] with size 1015153406 (compensated size 1023345694) 0 2014/09/03-20:46:31.916221 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916176) [default] Universal: Possible candidate file 206[5]. 2014/09/03-20:46:31.916223 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916176) [default] Universal: Skipping file 206[5] with size 4294684948 (compensated size 4294684948) 0 2014/09/03-20:46:31.916224 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916177) [default] Universal: Possible candidate file 353[0]. 2014/09/03-20:46:31.916226 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916181) [default] Universal: Picking file 353[0] with size 45765666 (compensated size 70532946) 2014/09/03-20:46:31.916227 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916182) [default] Universal: Picking file 351[1] with size 274767888 (compensated size 408189024) 2014/09/03-20:46:31.916228 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916183) [default] Universal: compacting for file num 2014/09/03-20:46:31.916230 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916188) [default] Compacting 2@0 + 0@0 files, score 1.50 slots available 0 2014/09/03-20:46:31.916231 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916194) [default] Compaction start summary: Base version 194 Base level 0, seek compaction:0, inputs: [353(43MB) 351(262MB)] 2014/09/03-20:46:36.894985 7fb779c1c700 Table was constructed: [basic properties]: # data blocks=107682; # entries=467217; raw key size=5606604; raw average key size=12.000000; raw value size=442350465; raw average value size=946.777333; data block size=316861421; index block size=3138463; filter block size=1703550; (estimated) table size=321703434; filter policy name=rocksdb.BuiltinBloomFilter; [user collected properties]: kDeletedKeys=94272; 2014/09/03-20:46:41.655969 7fb779c1c700 [default] Generated table #354: 467217 keys, 320540837 bytes 2014/09/03-20:46:41.656873 7fb779c1c700 (Original Log Time 2014/09/03-20:46:41.656388) [default] Compacted 2@0 + 0@0 files => 320540837 bytes 2014/09/03-20:46:41.656877 7fb779c1c700 (Original Log Time 2014/09/03-20:46:41.656834) [default] compacted to: files[5 0 0 0 0 0 0], 65.8 MB/sec, level 0, files in(2, 0) out(1) MB in(305.7, 0.0) out(305.7), read-write-amplify(2.0) write-amplify(1.0) OK 2014/09/03-20:46:41.677848 7fb779c1c700 Delete /Partition 12/000349.log type=0 #349 -- OK 2014/09/03-20:46:41.690663 7fb779c1c700 Delete /Partition 12/000353.sst type=2 #353 -- OK 2014/09/03-20:46:41.783902 7fb779c1c700 Delete /Partition 12/000351.sst type=2 #351 -- OK"><pre class="notranslate"><code class="notranslate">2014/09/03-20:46:31.916208 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916168) [default] Universal: Possible candidate file 353[0]. 2014/09/03-20:46:31.916209 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916169) [default] Universal: Skipping file 353[0] with size 45765666 (compensated size 70532946) 0 2014/09/03-20:46:31.916210 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916170) [default] Universal: Possible candidate file 351[1]. 2014/09/03-20:46:31.916212 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916170) [default] Universal: Skipping file 351[1] with size 274767888 (compensated size 408189024) 0 2014/09/03-20:46:31.916213 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916171) [default] Universal: Possible candidate file 334[2]. 2014/09/03-20:46:31.916215 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916173) [default] Universal: Skipping file 334[2] with size 735666259 (compensated size 738294227) 0 2014/09/03-20:46:31.916216 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916173) [default] Universal: Possible candidate file 300[3]. 2014/09/03-20:46:31.916217 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916174) [default] Universal: Skipping file 300[3] with size 782344698 (compensated size 785612346) 0 2014/09/03-20:46:31.916219 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916175) [default] Universal: Possible candidate file 252[4]. 2014/09/03-20:46:31.916220 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916175) [default] Universal: Skipping file 252[4] with size 1015153406 (compensated size 1023345694) 0 2014/09/03-20:46:31.916221 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916176) [default] Universal: Possible candidate file 206[5]. 2014/09/03-20:46:31.916223 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916176) [default] Universal: Skipping file 206[5] with size 4294684948 (compensated size 4294684948) 0 2014/09/03-20:46:31.916224 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916177) [default] Universal: Possible candidate file 353[0]. 2014/09/03-20:46:31.916226 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916181) [default] Universal: Picking file 353[0] with size 45765666 (compensated size 70532946) 2014/09/03-20:46:31.916227 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916182) [default] Universal: Picking file 351[1] with size 274767888 (compensated size 408189024) 2014/09/03-20:46:31.916228 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916183) [default] Universal: compacting for file num 2014/09/03-20:46:31.916230 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916188) [default] Compacting 2@0 + 0@0 files, score 1.50 slots available 0 2014/09/03-20:46:31.916231 7fb779c1c700 (Original Log Time 2014/09/03-20:46:31.916194) [default] Compaction start summary: Base version 194 Base level 0, seek compaction:0, inputs: [353(43MB) 351(262MB)] 2014/09/03-20:46:36.894985 7fb779c1c700 Table was constructed: [basic properties]: # data blocks=107682; # entries=467217; raw key size=5606604; raw average key size=12.000000; raw value size=442350465; raw average value size=946.777333; data block size=316861421; index block size=3138463; filter block size=1703550; (estimated) table size=321703434; filter policy name=rocksdb.BuiltinBloomFilter; [user collected properties]: kDeletedKeys=94272; 2014/09/03-20:46:41.655969 7fb779c1c700 [default] Generated table #354: 467217 keys, 320540837 bytes 2014/09/03-20:46:41.656873 7fb779c1c700 (Original Log Time 2014/09/03-20:46:41.656388) [default] Compacted 2@0 + 0@0 files => 320540837 bytes 2014/09/03-20:46:41.656877 7fb779c1c700 (Original Log Time 2014/09/03-20:46:41.656834) [default] compacted to: files[5 0 0 0 0 0 0], 65.8 MB/sec, level 0, files in(2, 0) out(1) MB in(305.7, 0.0) out(305.7), read-write-amplify(2.0) write-amplify(1.0) OK 2014/09/03-20:46:41.677848 7fb779c1c700 Delete /Partition 12/000349.log type=0 #349 -- OK 2014/09/03-20:46:41.690663 7fb779c1c700 Delete /Partition 12/000353.sst type=2 #353 -- OK 2014/09/03-20:46:41.783902 7fb779c1c700 Delete /Partition 12/000351.sst type=2 #351 -- OK </code></pre></div> </td> </tr> <tr class="d-block pl-3 pr-3 pb-3 js-comment-body-error" hidden> <td class="d-block"> <div class="flash flash-warn" role="alert"> <p class="mb-1"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-info"> <path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path> </svg> The text was updated 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js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " id="issuecomment-55861876"> <div class="ml-n3 timeline-comment unminimized-comment comment previewable-edit js-task-list-container js-comment timeline-comment--caret" data-body-version="e212aae15f142380b383b5c280544d46bf452796b91a78525e4d69b0e737d253"> <div class="timeline-comment-header clearfix d-flex" data-morpheus-enabled="false"> <div class="timeline-comment-actions flex-shrink-0 d-flex flex-items-center"> <details class="details-overlay details-reset position-relative d-inline-block"> <summary data-view-component="true" class="timeline-comment-action Link--secondary Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label"><svg aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-55861876-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user has previously committed to the rocksdb repository." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Contributor</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/yhchiang/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/yhchiang">yhchiang</a> </strong> commented <a href="#issuecomment-55861876" id="issuecomment-55861876-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2014-09-17T08:07:27Z" class="no-wrap">Sep 17, 2014</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">Thanks for reporting this. Can I first get your testing code to further investigate the issue?</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/facebook/rocksdb/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="PFdmg_lnVS_5rGTp5iaALz9jv2i89paBK6nmpIOL2LfRfM6bGRci6oTc8chY1S2_lcurNsqNO1duVz-YvQWkbQ" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDU1ODYxODc2"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-55861876-edit-form" data-turbo="false" action="/facebook/rocksdb/issue_comments/55861876" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="Z4vnAOMsR6K4vDMHMTPApAmt4WToahjsDUxrXA2fxgIQkzVWj8L7cqJyAgDy2PA190353k4y6NrQ9LqLbAG1ag==" /> <include-fragment loading="lazy" src="/facebook/rocksdb/issue_comments/55861876/edit_form?textarea_id=issuecomment-55861876-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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Since deletes are not actually deletes, but rather tombstones (which get cleaned up after a compaction), your iterator might have to skip a bunch of deletes the get to the first key in the database.</p> <p dir="auto">Can you profile your code and see where it's spending most of the time?</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/facebook/rocksdb/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="x7ImPnSD2nNa_14JCDZtp9lnNrDXp0pwIKtHg3D7aLIqmY4mlPOttiePyyi2xcA3c88i7qHc56ZlVZ6_TnUUaA" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDU1OTE3MzUx"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-55917351-edit-form" data-turbo="false" action="/facebook/rocksdb/issue_comments/55917351" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="5oWUjn97RNkSeu+Y96DieNtJTPicgWISZwRXpKOAAVROGCh75aLj+LxGrGVbgnsDvsaAYRs2C//l6XWbBuFNkg==" /> <include-fragment loading="lazy" src="/facebook/rocksdb/issue_comments/55917351/edit_form?textarea_id=issuecomment-55917351-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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Since we run within the JVM it's difficult to get a good profiling report. I will write a test program in C and get back to you guys.</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/facebook/rocksdb/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="2NNZWq_CMb26K1KZdJg4-Jgkw_vKdTTc10kYqYb0K5A1-PFCT7JGeMdbx7jKa5VoMozXpbwOmQqSt8GVuHpXSg" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDU1OTM4NjE5"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> 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1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path> </svg> Sorry, something went wrong. </p> </include-fragment> </form> </div> </div> </div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="MDEyOklzc3VlQ29tbWVudDkxMzUwOTEz"> <div class="TimelineItem js-comment-container" data-gid="MDEyOklzc3VlQ29tbWVudDkxMzUwOTEz" data-url="/facebook/rocksdb/comments/MDEyOklzc3VlQ29tbWVudDkxMzUwOTEz/partials/timeline_issue_comment" > <div class="avatar-parent-child TimelineItem-avatar d-none d-md-block"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/igorcanadi/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/igorcanadi"><img 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aria-label="Show options" role="img" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal"> <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-91350913-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user has been invited to collaborate on the rocksdb repository." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Collaborator</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/igorcanadi/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/igorcanadi">igorcanadi</a> </strong> commented <a href="#issuecomment-91350913" id="issuecomment-91350913-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2015-04-09T20:42:18Z" class="no-wrap">Apr 9, 2015</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">@naveenatceg any updates? :)</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/facebook/rocksdb/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="AMUbEEIvR9qC29VyEGNF1u5ZDyHB9rUJYbDfYYRM_Oft7rMIol8wH_-rQFOukOhGRPEbf7eNGN8kTgZdusKAPQ" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDkxMzUwOTEz"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" 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1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path> </svg></span> </span> </summary> <details-menu class="dropdown-menu dropdown-menu-sw show-more-popover color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-91441407-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> <span aria-label="This user is the author of this issue." data-view-component="true" class="tooltipped tooltipped-n"> <span data-view-component="true" class="Label ml-1">Author</span> </span> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/nav568/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/nav568">nav568</a> </strong> commented <a href="#issuecomment-91441407" id="issuecomment-91441407-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2015-04-10T06:04:57Z" class="no-wrap">Apr 10, 2015</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">Hey Igor,<br> Sorry for dropping ball on this, been busy with other stuff :(. Here's the code I used to test:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="package com.linkedin.samza.test.perf; import org.apache.samza.config.Config; import org.apache.samza.metrics.Counter; import org.apache.samza.metrics.Gauge; import org.apache.samza.storage.kv.Entry; import org.apache.samza.storage.kv.KeyValueIterator; import org.apache.samza.storage.kv.KeyValueStore; import org.apache.samza.system.IncomingMessageEnvelope; import org.apache.samza.task.InitableTask; import org.apache.samza.task.MessageCollector; import org.apache.samza.task.StreamTask; import org.apache.samza.task.TaskContext; import org.apache.samza.task.TaskCoordinator; import org.apache.samza.task.WindowableTask; public class TestStoreAllPerformance implements StreamTask, InitableTask, WindowableTask { private static final String METRICS_GROUP = TestStoreAllPerformance.class.getCanonicalName(); private KeyValueStore<Integer, Object> store = null; private int messageCount = 0; private int deletesPerWindow = 0; private int messagesToPutInStore = 0; private Gauge<Integer> itemsInStore = null; private Counter timeSpentInAll = null; private KeyValueIterator<Integer, Object> iterator = null; @SuppressWarnings("unchecked") @Override public void init(Config config, TaskContext context) throws Exception { deletesPerWindow = config.getInt("test.deletes.per.window", 8); messagesToPutInStore = config.getInt("test.messages.to.put.in.store", Integer.MAX_VALUE); System.err.println("The maximum messages allowed is:" + messagesToPutInStore); store = (KeyValueStore<Integer, Object>) context.getStore("test-store-all-calls"); itemsInStore = context.getMetricsRegistry().newGauge(METRICS_GROUP, "items-in-store", 0); timeSpentInAll = context.getMetricsRegistry().newCounter(METRICS_GROUP, "time-spent-in-all"); } @Override public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator) throws Exception { if (messageCount < messagesToPutInStore) { store.put(messageCount, envelope.getMessage()); ++messageCount; itemsInStore.set(itemsInStore.getValue() + 1); } } @Override public void window(MessageCollector collector, TaskCoordinator coordinator) throws Exception { long startTime = System.currentTimeMillis(); iterator = store.all(); timeSpentInAll.inc(System.currentTimeMillis() - startTime); for (int i = 0; i < deletesPerWindow && iterator.hasNext(); ++i) { Entry<Integer, Object> row = iterator.next(); store.delete(row.getKey()); itemsInStore.set(itemsInStore.getValue() - 1); } iterator.close(); } }"><pre class="notranslate"><code class="notranslate">package com.linkedin.samza.test.perf; import org.apache.samza.config.Config; import org.apache.samza.metrics.Counter; import org.apache.samza.metrics.Gauge; import org.apache.samza.storage.kv.Entry; import org.apache.samza.storage.kv.KeyValueIterator; import org.apache.samza.storage.kv.KeyValueStore; import org.apache.samza.system.IncomingMessageEnvelope; import org.apache.samza.task.InitableTask; import org.apache.samza.task.MessageCollector; import org.apache.samza.task.StreamTask; import org.apache.samza.task.TaskContext; import org.apache.samza.task.TaskCoordinator; import org.apache.samza.task.WindowableTask; public class TestStoreAllPerformance implements StreamTask, InitableTask, WindowableTask { private static final String METRICS_GROUP = TestStoreAllPerformance.class.getCanonicalName(); private KeyValueStore<Integer, Object> store = null; private int messageCount = 0; private int deletesPerWindow = 0; private int messagesToPutInStore = 0; private Gauge<Integer> itemsInStore = null; private Counter timeSpentInAll = null; private KeyValueIterator<Integer, Object> iterator = null; @SuppressWarnings("unchecked") @Override public void init(Config config, TaskContext context) throws Exception { deletesPerWindow = config.getInt("test.deletes.per.window", 8); messagesToPutInStore = config.getInt("test.messages.to.put.in.store", Integer.MAX_VALUE); System.err.println("The maximum messages allowed is:" + messagesToPutInStore); store = (KeyValueStore<Integer, Object>) context.getStore("test-store-all-calls"); itemsInStore = context.getMetricsRegistry().newGauge(METRICS_GROUP, "items-in-store", 0); timeSpentInAll = context.getMetricsRegistry().newCounter(METRICS_GROUP, "time-spent-in-all"); } @Override public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator) throws Exception { if (messageCount < messagesToPutInStore) { store.put(messageCount, envelope.getMessage()); ++messageCount; itemsInStore.set(itemsInStore.getValue() + 1); } } @Override public void window(MessageCollector collector, TaskCoordinator coordinator) throws Exception { long startTime = System.currentTimeMillis(); iterator = store.all(); timeSpentInAll.inc(System.currentTimeMillis() - startTime); for (int i = 0; i < deletesPerWindow && iterator.hasNext(); ++i) { Entry<Integer, Object> row = iterator.next(); store.delete(row.getKey()); itemsInStore.set(itemsInStore.getValue() - 1); } iterator.close(); } } </code></pre></div> <p dir="auto">The all() call does something very simple to open the iterator.</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" def all(): KeyValueIterator[Array[Byte], Array[Byte]] = { metrics.alls.inc val iter = db.newIterator() iter.seekToFirst() new RocksDbIterator(iter) }"><pre class="notranslate"><code class="notranslate"> def all(): KeyValueIterator[Array[Byte], Array[Byte]] = { metrics.alls.inc val iter = db.newIterator() iter.seekToFirst() new RocksDbIterator(iter) } </code></pre></div> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/facebook/rocksdb/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="ewUjTAXxQy1PjdU-MUNdx_uxeG0jehlW075w7bH46pyWLotU5YE06DL9QB-PsPBXURlsM1UBtICWQKnRj3aWRg" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDkxNDQxNDA3"> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-91441407-edit-form" data-turbo="false" action="/facebook/rocksdb/issue_comments/91441407" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="x6lMjaF8uCbwYZyE35C1QtPLgR9H9F8t65HaJ6GN/0khG65N3VXTQcLssRoRlEurz581bPk4GXqizY3cR71KhA==" /> <include-fragment loading="lazy" src="/facebook/rocksdb/issue_comments/91441407/edit_form?textarea_id=issuecomment-91441407-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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You need to iterate over bunch of deletions on SeekToFirst(). One way to confirm this is by utilizing our perf_context functionality: <a href="https://github.com/facebook/rocksdb/blob/master/include/rocksdb/perf_context.h">https://github.com/facebook/rocksdb/blob/master/include/rocksdb/perf_context.h</a></p> <p dir="auto">From C++:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="rocksdb::SetPerfLevel(rocksdb::kEnableCount); rocksdb::perf_context.Reset(); // do your thing -- SeekToFirst() cout << rocksdb::perf_context.ToString();"><pre class="notranslate"><code class="notranslate">rocksdb::SetPerfLevel(rocksdb::kEnableCount); rocksdb::perf_context.Reset(); // do your thing -- SeekToFirst() cout << rocksdb::perf_context.ToString(); </code></pre></div> <p dir="auto">You should notice that <code class="notranslate">internal_delete_skipped_count</code> is very high.</p> <p dir="auto">If your updates are always increasing, you can fix this by caching smallest live key and then instead of doing SeekToFirst(), just do Seek(smallest_live_key).</p> <p dir="auto">I did something similar in mongo-rocks: <a href="https://github.com/mongodb-partners/mongo-rocks/blob/master/src/rocks_record_store.cpp#L418">https://github.com/mongodb-partners/mongo-rocks/blob/master/src/rocks_record_store.cpp#L418</a> (check out _oplogNextToDelete)</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/facebook/rocksdb/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="FPmUdi5x0v_NYFJZU8TUnqJCZQRK2R6TzLCFleUYNJv50jxuzgGlOrAQx3jtN3kOCOpxWjyis0WJTlyp25ZIQQ" 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13, 2015</relative-time></a> </div> </div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="MDEyOklzc3VlQ29tbWVudDEyNzY5NDg0OA=="> <div class="TimelineItem js-comment-container" data-gid="MDEyOklzc3VlQ29tbWVudDEyNzY5NDg0OA==" data-url="/facebook/rocksdb/comments/MDEyOklzc3VlQ29tbWVudDEyNzY5NDg0OA==/partials/timeline_issue_comment" > <div class="avatar-parent-child TimelineItem-avatar d-none d-md-block"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/ghost/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/ghost"><img class="avatar rounded-2 avatar-user" src="https://avatars.githubusercontent.com/u/10137?s=80&v=4" width="40" height="40" alt="@ghost" /></a> </div> <div class=" timeline-comment-group js-minimizable-comment-group js-targetable-element TimelineItem-body my-0 " id="issuecomment-127694848"> <div class="ml-n3 timeline-comment unminimized-comment comment 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color-fg-default" style="width:185px" src="" preload > <span data-view-component="true"> <clipboard-copy aria-label="Copy link" for="issuecomment-127694848-permalink" role="menuitem" data-view-component="true" class="dropdown-item btn-link"> Copy link </clipboard-copy> <div aria-live="polite" aria-atomic="true" class="sr-only" data-clipboard-copy-feedback></div> </span> </details-menu> </details> </div> <div class="d-none d-sm-flex"> </div> <h3 class="f5 text-normal" style="flex: 1 1 auto"> <div> <strong> <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/ghost/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/ghost">ghost</a> </strong> commented <a href="#issuecomment-127694848" id="issuecomment-127694848-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2015-08-04T18:05:37Z" class="no-wrap">Aug 4, 2015</relative-time></a> </div> </h3> </div> <div class="edit-comment-hide"> <task-lists disabled sortable> <table class="d-block user-select-contain" data-paste-markdown-skip> <tbody class="d-block"> <tr class="d-block"> <td class="d-block comment-body markdown-body js-comment-body"> <p dir="auto">Thank you for reporting this issue and appreciate your patience. We've notified the core team for an update on this issue. We're looking for a response within the next 30 days or the issue may be closed.</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/facebook/rocksdb/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="0P-6Fx_msb6QP9VK3VO2uG5bKwj1e2jBs-dZAMqLIrs91BIP_5bGe-1PQGtjoBsoxPM_VoMAxRf2GYA89AVeYQ" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDEyNzY5NDg0OA=="> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-127694848-edit-form" data-turbo="false" action="/facebook/rocksdb/issue_comments/127694848" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="U1+FM+kEXP08CAsjh6FGSMylDU+/KfERdO9IJE2D/jvwFhiQel/x19raZxgsDwRpf3Dcz82Bxe6CpzNZMdKncw==" /> <include-fragment loading="lazy" src="/facebook/rocksdb/issue_comments/127694848/edit_form?textarea_id=issuecomment-127694848-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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One of our application stuck with long latency in this SeekToFirst() operation. I took a test program try to open the db and list all the keys and found that the latency listing n keys vs the latency listing n+1 keys sometimes differs by orders of magnitude: i.e. in my test, listing 141 keys from an open iterator takes 64ms and listing 142 keys from an open iterator takes 4. second. It seems likes that the problem does not only exist in SeekToFirst(). Iterator.next() may hit the same problem, if there are a large number of deleted records in-between two keys. The only solution to this seems to be the compaction. However, we noticed that there is no log indicating that compaction thread is active for about 6 days. Is it a known issue? Under which conditions the compaction thread will not actually compact the SST files? What would be the suggested solution?</p> <p dir="auto">Thanks a lot!</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/facebook/rocksdb/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="olcDiduNNYqN_hzLN3wjNUxyFlUf0Ng8G8s5PbltyM9PfKuRO_1CT_COieqJj46l5toCC2mrdepeNeABh-O0FQ" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDE1NTU0NTU3Mw=="> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-155545573-edit-form" data-turbo="false" action="/facebook/rocksdb/issue_comments/155545573" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="9j+Squ07J0sJy1y3osPqLyLL1KQH9H15alfQkG0jWllcLkU48dalnIIkZZYPpFtQdZtwVX2ODjSDSIWjUdbpuQ==" /> <include-fragment loading="lazy" src="/facebook/rocksdb/issue_comments/155545573/edit_form?textarea_id=issuecomment-155545573-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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You can manually issue compaction by calling CompactRange() method.</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/facebook/rocksdb/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="iPOmN99vhVcQID9mr9f41xDaqkWPg4tXhLczZwQWaNll2A4vPx_ykm1QqkcRJFVHunK-G_n4JoHBSepbOpgUAw" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDE1NTU0ODg5MA=="> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-155548890-edit-form" data-turbo="false" action="/facebook/rocksdb/issue_comments/155548890" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="LeYLncArIFy//1w0R6FZMH6FIp38kxKH4iSjmAMrZ/dFvu5nnu/DGEKR0gHagbBvdEeM2FPanVT2dbJjX4cl6w==" /> <include-fragment loading="lazy" src="/facebook/rocksdb/issue_comments/155548890/edit_form?textarea_id=issuecomment-155548890-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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I have the following additional questions:</p> <ol dir="auto"> <li>How do we tune up the compaction threshold/trigger? I.e. is there a way to force a compaction if the size ratio condition is met but there is only reads no writes? The reason for that is: if the compact does not happen in this condition, the read performance will continue to be bad.</li> <li>If we have to manually trigger compaction, is CompactRange() method a blocking / sync method or non-blocking/async?</li> </ol> <p dir="auto">Lastly, a newbie question, for the following snapshot of a RocksDB instance, how do I detect sorted runs here? Are the smaller number .sst files older runs or newer runs?<br> {code}<br> [yipan@ela4-app0956 Partition 23]$ ls -lrt<br> total 3388844<br> -rw-r--r-- 1 app app 0 Nov 5 23:53 LOCK<br> -rw-r--r-- 1 app app 37 Nov 5 23:53 IDENTITY<br> -rw-r--r-- 1 app app 0 Nov 5 23:53 000003.log<br> -rw-r--r-- 1 app app 16 Nov 5 23:53 CURRENT<br> -rw-r--r-- 1 app app 3440456743 Nov 6 11:53 001591.sst<br> -rw-r--r-- 1 app app 10478037 Nov 6 13:03 001592.sst<br> -rw-r--r-- 1 app app 10672441 Nov 6 14:14 001593.sst<br> -rw-r--r-- 1 app app 247978 Nov 6 14:14 MANIFEST-000005<br> -rw-r--r-- 1 app app 8290332 Nov 6 14:14 LOG<br> {code}</p> <p dir="auto">Thanks a lot in advance!</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/facebook/rocksdb/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="A5JhGsE4As4Pzm1KxGx6gHYieQs3mA_RitulgKd7tAbuuckCIUh1C3K--Gt6n9cQ3IptVUHjogfPJXy8mfXI3A" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDE1NTYwMzQwMA=="> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div class="js-reactions-container"> <details class="dropdown details-reset details-overlay d-inline-block js-all-reactions-popover" hidden> <summary aria-haspopup="true" data-view-component="true" class="Button--link Button--medium Button"> <span class="Button-content"> <span class="Button-label">All reactions</span> </span> </summary> <ul class="dropdown-menu dropdown-menu-se"> </ul> </details> </div> </div> </form></div> </div> </div> </div> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-comment-update" id="issuecomment-155603400-edit-form" data-turbo="false" action="/facebook/rocksdb/issue_comments/155603400" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" data-csrf="true" name="authenticity_token" value="bxlOzhOb9mJta1l9Ektxe5D/mGA3q2oTU4v+m8yDX0ICoUDJ6cYRsw5BPjvmA3dnf+XRb1ivbmE5MlJAw5pqKQ==" /> <include-fragment loading="lazy" src="/facebook/rocksdb/issue_comments/155603400/edit_form?textarea_id=issuecomment-155603400-body&comment_context=" class="previewable-comment-form js-comment-edit-form-deferred-include-fragment" > <p class="text-center mt-3" data-hide-on-error> <span data-view-component="true"> <svg aria-label="Loading..." style="box-sizing: content-box; 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If discussion is still needed here, please re-open or create a new/updated issue.</p> </td> </tr> </tbody> </table> </task-lists> <div class="d-flex"> <div class="pr-review-reactions"> <div data-view-component="true" class="comment-reactions js-reactions-container js-reaction-buttons-container social-reactions reactions-container d-none"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="js-pick-reaction" data-turbo="false" action="/facebook/rocksdb/reactions" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" autocomplete="off" /><input type="hidden" name="authenticity_token" value="Ou8JBEAegqHYFQciLfxyqVWPf0v5Zt1mHwROT1wIOBvXxKEcoG71ZKVlkgOTD985_ydrFY8dcLBa-pdzYoZEwQ" autocomplete="off" /> <input type="hidden" name="input[subjectId]" value="MDEyOklzc3VlQ29tbWVudDM1Njc0MDM3OQ=="> <input type="hidden" name="input[context]" value="" > <div class="js-comment-reactions-options d-flex flex-items-center flex-row flex-wrap"> <div 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1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path> </svg> Sorry, something went wrong. </p> </include-fragment> </form> </div> </div> </div> </div> <div class="js-timeline-item js-timeline-progressive-focus-container" data-gid="MDEyOkxhYmVsZWRFdmVudDE0MTg1NjY5MTA="> <div class="TimelineItem js-targetable-element" data-team-hovercards-enabled id="event-1418566910"> <div class="TimelineItem-badge "> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-tag color-fg-inherit"> <path d="M1 7.775V2.75C1 1.784 1.784 1 2.75 1h5.025c.464 0 .91.184 1.238.513l6.25 6.25a1.75 1.75 0 0 1 0 2.474l-5.026 5.026a1.75 1.75 0 0 1-2.474 0l-6.25-6.25A1.752 1.752 0 0 1 1 7.775Zm1.5 0c0 .066.026.13.073.177l6.25 6.25a.25.25 0 0 0 .354 0l5.025-5.025a.25.25 0 0 0 0-.354l-6.25-6.25a.25.25 0 0 0-.177-.073H2.75a.25.25 0 0 0-.25.25ZM6 5a1 1 0 1 1 0 2 1 1 0 0 1 0-2Z"></path> </svg> </div> <div class="TimelineItem-body"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/gfosco/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/gfosco"><img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/406732?s=40&u=0b53ff0050e6ea657370bca53d1024bbc21a7ae7&v=4" width="20" height="20" alt="@gfosco" /></a> <a class="author Link--primary text-bold" data-hovercard-type="user" data-hovercard-url="/users/gfosco/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/gfosco">gfosco</a> added the <a id="label-59682a" href="/facebook/rocksdb/labels/abandoned-or-aged-out" data-name="abandoned-or-aged-out" style="--label-r:168;--label-g:10;--label-b:65;--label-h:339;--label-s:88;--label-l:34;" data-view-component="true" class="IssueLabel hx_IssueLabel d-inline-block v-align-middle"> abandoned-or-aged-out </a> label <a href="#event-1418566910" class="Link--secondary"><relative-time datetime="2018-01-10T21:20:48Z" class="no-wrap">Jan 10, 2018</relative-time></a> </div> </div> <div class="TimelineItem js-targetable-element" data-team-hovercards-enabled id="event-1418566914"> <div class="TimelineItem-badge color-fg-on-emphasis color-bg-done-emphasis"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-issue-closed color-fg-inherit"> <path d="M11.28 6.78a.75.75 0 0 0-1.06-1.06L7.25 8.69 5.78 7.22a.75.75 0 0 0-1.06 1.06l2 2a.75.75 0 0 0 1.06 0l3.5-3.5Z"></path><path d="M16 8A8 8 0 1 1 0 8a8 8 0 0 1 16 0Zm-1.5 0a6.5 6.5 0 1 0-13 0 6.5 6.5 0 0 0 13 0Z"></path> </svg> </div> <div class="TimelineItem-body"> <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/gfosco/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/gfosco"><img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/406732?s=40&u=0b53ff0050e6ea657370bca53d1024bbc21a7ae7&v=4" width="20" height="20" alt="@gfosco" /></a> <a class="author Link--primary text-bold" data-hovercard-type="user" data-hovercard-url="/users/gfosco/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/gfosco">gfosco</a> closed this as <a class="Link--secondary Link--inTextBlock" href="/facebook/rocksdb/issues?q=is%3Aissue+is%3Aclosed+archived%3Afalse+reason%3Acompleted">completed</a> <a href="#event-1418566914" class="Link--secondary"><relative-time datetime="2018-01-10T21:20:49Z" class="no-wrap">Jan 10, 2018</relative-time></a> </div> </div> <div class="TimelineItem-break mb-0 height-full"></div> <div class="TimelineItem 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data-hovercard-url="/users/gfosco/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/gfosco">gfosco</a> unassigned <a data-hovercard-type="user" data-hovercard-url="/users/igorcanadi/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/igorcanadi"><span class="Link--primary text-bold">igorcanadi</span></a> <a href="#event-1418566916" class="Link--secondary"><relative-time datetime="2018-01-10T21:20:49Z" class="no-wrap">Jan 10, 2018</relative-time></a> </div> </div> <div class="TimelineItem"> <div class="TimelineItem-badge"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-cross-reference"> <path d="M2.75 3.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h4.5a.25.25 0 0 0 .25-.25v-2.5a.75.75 0 0 1 1.5 0v2.5A1.75 1.75 0 0 1 13.25 13H9.06l-2.573 2.573A1.458 1.458 0 0 1 4 14.543V13H2.75A1.75 1.75 0 0 1 1 11.25v-7.5C1 2.784 1.784 2 2.75 2h5.5a.75.75 0 0 1 0 1.5ZM16 1.25v4.146a.25.25 0 0 1-.427.177L14.03 4.03l-3.75 3.75a.749.749 0 0 1-1.275-.326.749.749 0 0 1 .215-.734l3.75-3.75-1.543-1.543A.25.25 0 0 1 11.604 1h4.146a.25.25 0 0 1 .25.25Z"></path> </svg> </div> <div class="TimelineItem-body" > <div > <a class="d-inline-block" data-hovercard-type="user" data-hovercard-url="/users/sschepens/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/sschepens"><img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/3072509?s=40&v=4" width="20" height="20" alt="@sschepens" /></a> <a class="author Link--primary text-bold" data-hovercard-type="user" data-hovercard-url="/users/sschepens/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/sschepens">sschepens</a> mentioned this issue <a class="Link--secondary" href="#ref-issue-320549423" > <relative-time datetime="2018-05-06T02:01:25Z" class="no-wrap">May 6, 2018</relative-time> </a> </div> <div class="mt-2 d-flex flex-items-start flex-column flex-md-row"> <div class="flex-auto wb-break-word" id="ref-issue-320549423" > <a href="/apache/pulsar/issues/1737" class="Link--primary f4 text-bold markdown-title" data-hovercard-type="issue" data-hovercard-url="/apache/pulsar/issues/1737/hovercard"> Bookies at 100% CPU <span class="color-fg-muted text-normal" >apache/pulsar#1737</span> </a> </div> <div class="flex-shrink-0 my-1 my-md-0 ml-md-3"> <span title="Status: Closed" data-view-component="true" class="State State--merged State--small d-flex flex-items-center"> <svg aria-hidden="true" height="12" viewBox="0 0 16 16" version="1.1" width="12" data-view-component="true" class="octicon octicon-issue-closed flex-items-center mr-1"> <path d="M11.28 6.78a.75.75 0 0 0-1.06-1.06L7.25 8.69 5.78 7.22a.75.75 0 0 0-1.06 1.06l2 2a.75.75 0 0 0 1.06 0l3.5-3.5Z"></path><path d="M16 8A8 8 0 1 1 0 8a8 8 0 0 1 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class="TimelineItem-body" id="ref-commit-c1739a2"> <a class="author Link--primary text-bold" data-hovercard-type="user" data-hovercard-url="/users/luky116/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/luky116">luky116</a> pushed a commit to luky116/rocksdb that referenced this issue <a href="#ref-commit-c1739a2" class="Link--secondary"> <relative-time datetime="2024-07-10T09:09:54Z" class="no-wrap">Jul 10, 2024</relative-time> </a> <div class="mt-3"> <div class="js-details-container Details js-socket-channel js-updatable-content" data-channel="eyJjIjoicmVwbzo2NDYzMTUzMjY6Y29tbWl0OmMxNzM5YTIzM2I5MmVkMDQxNzZhYzMzM2RkYjNmZmU1ZmVlNWZiZjQiLCJ0IjoxNzMzMTUyMjI5fQ==--c28cd4af5840183ef329cbf6b29725688dd257bbf9a34c4bd9b49d957b35da66" data-url="/luky116/rocksdb/commit/c1739a233b92ed04176ac333ddb3ffe5fee5fbf4/show_partial?partial=commit%2Fcondensed_details"> <div class="d-flex flex-md-row flex-column"> <div class="d-flex flex-auto"> <div class="AvatarStack flex-self-start " > <div class="AvatarStack-body" > <a class="avatar avatar-user" style="width:20px;height:20px;" data-test-selector="commits-avatar-stack-avatar-link" data-hovercard-type="user" data-hovercard-url="/users/seckcoder/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/seckcoder"> <img data-test-selector="commits-avatar-stack-avatar-image" src="https://avatars.githubusercontent.com/u/882802?s=40&u=505f831c251353e086a08d5c980888651a8833cd&v=4" width="20" height="20" alt="@seckcoder" class=" avatar-user" /> </a> </div> </div> <div class="pr-1 flex-auto min-width-0" > <code> <a title="[sys-4675] Don't schedule file deletions if delay not set (#261) Changed cloud_file_deletion_delay to std::optional. If it's not set, instead of scheduling cloud file deletion on file deletion queue asynchronously, we delete the cloud files immediately. This is different from setting the value to 0, in which case, the file deletion is still scheduled asynchronously. Also did some minor cleanup: * removed useless TEST_ functions * only included TEST_ functions if compiling in debug build" data-pjax="true" class="Link--secondary markdown-title" href="/luky116/rocksdb/commit/c1739a233b92ed04176ac333ddb3ffe5fee5fbf4">[sys-4675] Don't schedule file deletions if delay not set (</a><a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="41880751" data-permission-text="Title is private" data-url="https://github.com/facebook/rocksdb/issues/261" data-hovercard-type="issue" data-hovercard-url="/facebook/rocksdb/issues/261/hovercard" href="https://github.com/facebook/rocksdb/issues/261">facebook#261</a><a title="[sys-4675] Don't schedule file deletions if delay not set (#261) Changed cloud_file_deletion_delay to std::optional. If it's not set, instead of scheduling cloud file deletion on file deletion queue asynchronously, we delete the cloud files immediately. This is different from setting the value to 0, in which case, the file deletion is still scheduled asynchronously. Also did some minor cleanup: * removed useless TEST_ functions * only included TEST_ functions if compiling in debug build" data-pjax="true" class="Link--secondary markdown-title" href="/luky116/rocksdb/commit/c1739a233b92ed04176ac333ddb3ffe5fee5fbf4">)</a> </code> <span class="hidden-text-expander inline"> <button type="button" class="ellipsis-expander js-details-target" aria-expanded="false">…</button> </span> </div> <div class="pr-1 d-md-inline-block d-none"> <batch-deferred-content class="d-inline-block" data-url="/commits/badges"> <input type="hidden" name="id" value="C_kwDOJoX9PtoAKGMxNzM5YTIzM2I5MmVkMDQxNzZhYzMzM2RkYjNmZmU1ZmVlNWZiZjQ" data-targets="batch-deferred-content.inputs" autocomplete="off" /> <input type="hidden" name="badge_size" value="small" data-targets="batch-deferred-content.inputs" autocomplete="off" /> <input type="hidden" name="dropdown_direction" value="w" data-targets="batch-deferred-content.inputs" autocomplete="off" /> <span class="Skeleton d-inline-block mr-1" style="width:75px; height:14px; margin-bottom:-4px;"></span> </batch-deferred-content> </div> <div class="pr-1 flex-shrink-0" style="width: 16px;"> </div> <!-- ml-1 is added to accommodate "clock" icon --> <div class="text-right ml-1"> <code> <a href="/luky116/rocksdb/commit/c1739a233b92ed04176ac333ddb3ffe5fee5fbf4" class="Link--secondary">c1739a2</a> </code> </div> </div> </div> <div class="Details-content--hidden mt-2"> <pre class="color-fg-muted ws-pre-wrap">Changed cloud_file_deletion_delay to std::optional. If it's not set, instead of scheduling cloud file deletion on file deletion queue asynchronously, we delete the cloud files immediately. This is different from setting the value to 0, in which case, the file deletion is still scheduled asynchronously. Also did some minor cleanup: * removed useless TEST_ functions * only included TEST_ functions if compiling in debug build</pre> </div> </div> </div> </div> </div> </div> <!-- Rendered timeline since 2024-07-10 02:09:54 --> <div class="js-timeline-marker js-socket-channel js-updatable-content" id="partial-timeline" data-channel="eyJjIjoiaXNzdWU6NDE4ODA3NTEiLCJ0IjoxNzMzMTUyMjI5fQ==--05936d5c7c98376ceb688cd9b3b223ffe2ff8b729925a463cb98ae78db3911d2" data-url="/facebook/rocksdb/issues/261/partials/unread_timeline?issue=261&since=2024-07-10T02%3A09%3A54.000000000-07%3A00" data-last-modified="2024-07-10T02:09:54.000000000-07:00" data-morpheus-enabled="false" data-gid="MDU6SXNzdWU0MTg4MDc1MQ=="> <!-- '"` --><!-- </textarea></xmp> --></option></form><form class="d-none js-timeline-marker-form" data-turbo="false" action="/_graphql/MarkNotificationSubjectAsRead" accept-charset="UTF-8" data-remote="true" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="ckj6f+EHMYI/kA1t1UEL3YlqJOigXFFOnZKQHtFdDpJPwXQAHxuA+8Z9vzf9Qe7Y/L/6PR2JjTWRjiK9K8KmgA==" /> <input type="hidden" name="variables[subjectId]" value="MDU6SXNzdWU0MTg4MDc1MQ=="> </form> </div> </div> </div> <span id="issue-comment-box"></span> <div class="discussion-timeline-actions"> <div data-view-component="true" class="flash flash-warn mt-3"> <a rel="nofollow" class="btn btn-primary" data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"signed out comment","repository_id":6934395,"auth_type":"SIGN_UP","originating_url":"https://github.com/facebook/rocksdb/issues/261","user_id":null}}" data-hydro-click-hmac="613bbfcd54e98d5c44fa8d1217dbced07384e8f4807a140cfaaa2d3d57e3b4c4" href="/join?source=comment-repo">Sign up for free</a> <strong>to join this conversation on GitHub</strong>. 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