addthis/hydra · GitHub

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On a per job basis add the ability to specify timeouts for onSuccess and onExit endpoints. If no timeout is specified then the cluster default timeout is used.">'onSuccess' and 'onExit' optional timeout values.</a> </span> </td> <td class="age"> <span class="css-truncate css-truncate-target"><time datetime="2014-06-19T19:05:25Z" is="time-ago">Jun 19, 2014</time></span> </td> </tr> <tr> <td class="icon"> <span class="octicon octicon-file-directory"></span> <img alt="" class="spinner" height="16" src="https://web.archive.org/web/20141121074123im_/https://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif" width="16"/> </td> <td class="content"> <span class="css-truncate css-truncate-target"><a href="/web/20141121074123/https://github.com/addthis/hydra/tree/master/hydra-avro" class="js-directory-link" id="93c0b9fa07733b8c92d44d7c38f419b1-0b3ca51374e493f2a681a7bdce7ca874cd29c053" title="hydra-avro">hydra-avro</a></span> </td> <td class="message"> <span class="css-truncate css-truncate-target"> <a 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</td> <td class="message"> <span class="css-truncate css-truncate-target"> <a href="/web/20141121074123/https://github.com/addthis/hydra/commit/37b5d34e20944a5c610189e2dfe2c70dfaf48221" class="message" data-pjax="true" title="Fix typo in generated hydra user reference.">Fix typo in generated hydra user reference.</a> </span> </td> <td class="age"> <span class="css-truncate css-truncate-target"><time datetime="2014-11-20T18:57:18Z" is="time-ago">Nov 20, 2014</time></span> </td> </tr> <tr> <td class="icon"> <span class="octicon octicon-file-directory"></span> <img alt="" class="spinner" height="16" src="https://web.archive.org/web/20141121074123im_/https://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif" width="16"/> </td> <td class="content"> <span class="css-truncate css-truncate-target"><a href="/web/20141121074123/https://github.com/addthis/hydra/tree/master/hydra-essentials" class="js-directory-link" id="77b686bc2df59213299d5d742450df89-64cdfc75123636f4dee89b0f139c70eac2704c69" title="hydra-essentials">hydra-essentials</a></span> </td> <td class="message"> <span class="css-truncate css-truncate-target"> <a href="/web/20141121074123/https://github.com/addthis/hydra/commit/bb9805a05b47e6de1177540204cde9d2d4429150" class="message" data-pjax="true" title="[maven-release-plugin]prepare for next development iteration">[maven-release-plugin]prepare for next development iteration</a> </span> </td> <td class="age"> <span class="css-truncate css-truncate-target"><time datetime="2014-11-19T16:20:21Z" is="time-ago">Nov 19, 2014</time></span> </td> </tr> <tr> <td class="icon"> <span class="octicon octicon-file-directory"></span> <img alt="" class="spinner" height="16" src="https://web.archive.org/web/20141121074123im_/https://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif" width="16"/> </td> <td class="content"> <span class="css-truncate css-truncate-target"><a 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width="16"/> </td> <td class="content"> <span class="css-truncate css-truncate-target"><a href="/web/20141121074123/https://github.com/addthis/hydra/tree/master/hydra-hdfs" class="js-directory-link" id="e59ae6b06affa3d3c24780c9804ea167-46eab7f484b91ab87a917daafea35732b0c8d385" title="hydra-hdfs">hydra-hdfs</a></span> </td> <td class="message"> <span class="css-truncate css-truncate-target"> <a href="/web/20141121074123/https://github.com/addthis/hydra/commit/bb9805a05b47e6de1177540204cde9d2d4429150" class="message" data-pjax="true" title="[maven-release-plugin]prepare for next development iteration">[maven-release-plugin]prepare for next development iteration</a> </span> </td> <td class="age"> <span class="css-truncate css-truncate-target"><time datetime="2014-11-19T16:20:21Z" is="time-ago">Nov 19, 2014</time></span> </td> </tr> <tr> <td class="icon"> <span class="octicon octicon-file-directory"></span> <img alt="" class="spinner" height="16" 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<span class="octicon octicon-file-directory"></span> <img alt="" class="spinner" height="16" src="https://web.archive.org/web/20141121074123im_/https://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif" width="16"/> </td> <td class="content"> <span class="css-truncate css-truncate-target"><a href="/web/20141121074123/https://github.com/addthis/hydra/tree/master/hydra-main" class="js-directory-link" id="318d4471b5787f360b2fec3d47c1f5f4-f2278be35db14470633fb23c49ba404638182492" title="hydra-main">hydra-main</a></span> </td> <td class="message"> <span class="css-truncate css-truncate-target"> <a href="/web/20141121074123/https://github.com/addthis/hydra/commit/58ad81524458d7d68bcd6cc5b283a9cd52b1625c" class="message" data-pjax="true" title="Only allow a disabled job to be enabled if it’s idle. Ref T50807">Only allow a disabled job to be enabled if it’s idle. Ref T50807</a> </span> </td> <td class="age"> <span class="css-truncate css-truncate-target"><time datetime="2014-11-21T01:47:39Z" is="time-ago">Nov 20, 2014</time></span> </td> </tr> <tr> <td class="icon"> <span class="octicon octicon-file-directory"></span> <img alt="" class="spinner" height="16" src="https://web.archive.org/web/20141121074123im_/https://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif" width="16"/> </td> <td class="content"> <span class="css-truncate css-truncate-target"><a href="/web/20141121074123/https://github.com/addthis/hydra/tree/master/hydra-mq" class="js-directory-link" id="73d526592af348a631e9346b863ee439-32b8b5fb552f90cc6e2d2fa1acf55f6f8fdccabc" title="hydra-mq">hydra-mq</a></span> </td> <td class="message"> <span class="css-truncate css-truncate-target"> <a href="/web/20141121074123/https://github.com/addthis/hydra/commit/bb9805a05b47e6de1177540204cde9d2d4429150" class="message" data-pjax="true" title="[maven-release-plugin]prepare for next development iteration">[maven-release-plugin]prepare for next development iteration</a> </span> </td> <td class="age"> <span class="css-truncate css-truncate-target"><time datetime="2014-11-19T16:20:21Z" is="time-ago">Nov 19, 2014</time></span> </td> </tr> <tr> <td class="icon"> <span class="octicon octicon-file-directory"></span> <img alt="" class="spinner" height="16" src="https://web.archive.org/web/20141121074123im_/https://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif" width="16"/> </td> <td class="content"> <span class="css-truncate css-truncate-target"><a href="/web/20141121074123/https://github.com/addthis/hydra/tree/master/hydra-store" class="js-directory-link" id="24c1b50e6ab3314e4fd7042cf966cd36-967301c43f599ffb43f41c52668680dae554a466" title="hydra-store">hydra-store</a></span> </td> <td class="message"> <span class="css-truncate css-truncate-target"> <a 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</td> <td class="message"> <span class="css-truncate css-truncate-target"> <a href="/web/20141121074123/https://github.com/addthis/hydra/commit/436f765bb2deb82827d10cbc69e4f85a4a1039f8" class="message" data-pjax="true" title="work-arounds for interrupt handling in muxy/bdb these hacks should eventually be replaced when I decide on how to refactor (a)sync start/stop/error reporting between various threaded sub-components">work-arounds for interrupt handling in muxy/bdb</a> </span> </td> <td class="age"> <span class="css-truncate css-truncate-target"><time datetime="2014-11-19T17:43:31Z" is="time-ago">Nov 19, 2014</time></span> </td> </tr> <tr> <td class="icon"> <span class="octicon octicon-file-directory"></span> <img alt="" class="spinner" height="16" src="https://web.archive.org/web/20141121074123im_/https://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif" width="16"/> </td> <td class="content"> <span class="css-truncate css-truncate-target"><a 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</td> <td class="content"> <span class="css-truncate css-truncate-target"><a href="/web/20141121074123/https://github.com/addthis/hydra/tree/master/resources" class="js-directory-link" id="55b558c7ef820e6e00e5993b9e55d93b-3c14d66a575e74e26ff9ad11b5fc834d773a7597" title="resources">resources</a></span> </td> <td class="message"> <span class="css-truncate css-truncate-target"> <a href="/web/20141121074123/https://github.com/addthis/hydra/commit/a2fd50a67573969f5862b24e58e2937f6fe18991" class="message" data-pjax="true" title="Initial commit of Javadoc landing page and CSS stylesheet.">Initial commit of Javadoc landing page and CSS stylesheet.</a> </span> </td> <td class="age"> <span class="css-truncate css-truncate-target"><time datetime="2014-01-10T20:23:13Z" is="time-ago">Jan 10, 2014</time></span> </td> </tr> <tr> <td class="icon"> <span class="octicon octicon-file-text"></span> <img alt="" class="spinner" height="16" src="https://web.archive.org/web/20141121074123im_/https://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif" width="16"/> </td> <td class="content"> <span class="css-truncate css-truncate-target"><a href="/web/20141121074123/https://github.com/addthis/hydra/blob/master/.gitignore" class="js-directory-link" id="a084b794bc0759e7a6b77810e01874f2-a44f91e2bf877f01e74371dbf882e346345298fa" title=".gitignore">.gitignore</a></span> </td> <td class="message"> <span class="css-truncate css-truncate-target"> <a href="/web/20141121074123/https://github.com/addthis/hydra/commit/92b91039105a7c1baae67d77ee2b8f20a09484bc" class="message" data-pjax="true" title="Revert "Adding index.min.html to gitignore." This reverts commit 077ee651a1c110c70c7ec4fde7eccae841158a9c.">Revert "Adding index.min.html to gitignore."</a> </span> </td> <td class="age"> <span class="css-truncate css-truncate-target"><time datetime="2014-06-24T13:43:44Z" is="time-ago">Jun 24, 2014</time></span> </td> </tr> <tr> <td class="icon"> <span class="octicon octicon-file-text"></span> <img alt="" class="spinner" height="16" src="https://web.archive.org/web/20141121074123im_/https://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif" width="16"/> </td> <td class="content"> <span class="css-truncate css-truncate-target"><a href="/web/20141121074123/https://github.com/addthis/hydra/blob/master/LICENSE" class="js-directory-link" id="9879d6db96fd29134fc802214163b95a-430d42bbea592e3c130eda0a07a7e1082b96ba73" title="LICENSE">LICENSE</a></span> </td> <td class="message"> <span class="css-truncate css-truncate-target"> <a href="/web/20141121074123/https://github.com/addthis/hydra/commit/4dc27085808a8fc367acb2d84dc81911670b2a8d" class="message" data-pjax="true" title="Initial Commit">Initial Commit</a> </span> </td> <td class="age"> <span class="css-truncate css-truncate-target"><time datetime="2013-12-27T14:44:02Z" is="time-ago">Dec 27, 2013</time></span> </td> </tr> <tr> <td class="icon"> <span class="octicon octicon-file-text"></span> <img alt="" class="spinner" height="16" src="https://web.archive.org/web/20141121074123im_/https://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif" width="16"/> </td> <td class="content"> <span class="css-truncate css-truncate-target"><a href="/web/20141121074123/https://github.com/addthis/hydra/blob/master/NOTICE" class="js-directory-link" id="aa14599dc3fdfa9cc81a7c3c247b77b9-4f4bcaefbd81cc39611043958a3d14f166f33c3b" title="NOTICE">NOTICE</a></span> </td> <td class="message"> <span class="css-truncate css-truncate-target"> <a href="/web/20141121074123/https://github.com/addthis/hydra/commit/1620976773ed1bb946e345d7a8ebf8994c724012" class="message" data-pjax="true" title="Import http://bitbucket.org/jlanchas/aho-corasick/ Apache-compatible license. NOTICE file updated with third party library. All source files have headers with the license file. We may consider http://ahocorasick.org as an eventual replacement. It is Apache licensed and available on maven central. It is a new project which is why I recommend waiting for the bugs to be shaken out.">Import</a> <a href="https://web.archive.org/web/20141121074123/http://bitbucket.org/jlanchas/aho-corasick/">http://bitbucket.org/jlanchas/aho-corasick/</a> </span> </td> <td class="age"> <span class="css-truncate css-truncate-target"><time datetime="2014-05-01T16:28:46Z" is="time-ago">May 1, 2014</time></span> </td> </tr> <tr> <td class="icon"> <span class="octicon octicon-file-text"></span> <img alt="" class="spinner" height="16" src="https://web.archive.org/web/20141121074123im_/https://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif" width="16"/> </td> <td class="content"> <span class="css-truncate css-truncate-target"><a href="/web/20141121074123/https://github.com/addthis/hydra/blob/master/README.mdown" class="js-directory-link" id="1647c9289d3ab11892a8ba9b2f8cf8bc-f51128dc232d9beb01853a46ec61fe83acd411b8" title="README.mdown">README.mdown</a></span> </td> <td class="message"> <span class="css-truncate css-truncate-target"> <a href="/web/20141121074123/https://github.com/addthis/hydra/commit/7cae32deecb2fa6ad4d4c4b66de2711de8e87531" class="message" data-pjax="true" title="java 8 now required">java 8 now required</a> </span> </td> <td class="age"> <span class="css-truncate css-truncate-target"><time datetime="2014-11-07T03:28:11Z" is="time-ago">Nov 6, 2014</time></span> </td> </tr> <tr> <td class="icon"> <span class="octicon octicon-file-text"></span> <img alt="" class="spinner" height="16" src="https://web.archive.org/web/20141121074123im_/https://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif" width="16"/> </td> <td class="content"> <span class="css-truncate css-truncate-target"><a href="/web/20141121074123/https://github.com/addthis/hydra/blob/master/pom.xml" class="js-directory-link" id="600376dffeb79835ede4a0b285078036-c0c929e4d7a218708988ce3d042dc6e3301b1664" title="pom.xml">pom.xml</a></span> </td> <td class="message"> <span class="css-truncate css-truncate-target"> <a href="/web/20141121074123/https://github.com/addthis/hydra/commit/bb9805a05b47e6de1177540204cde9d2d4429150" class="message" data-pjax="true" title="[maven-release-plugin]prepare for next development iteration">[maven-release-plugin]prepare for next development iteration</a> </span> </td> <td class="age"> <span class="css-truncate css-truncate-target"><time datetime="2014-11-19T16:20:21Z" is="time-ago">Nov 19, 2014</time></span> </td> </tr> </tbody> </table> </div> <div id="readme" class="boxed-group flush clearfix announce instapaper_body mdown"> <h3> <span class="octicon octicon-book"></span> README.mdown </h3> <article class="markdown-body entry-content" itemprop="mainContentOfPage"><h2> <a id="user-content-hydra" class="anchor" href="#hydra" aria-hidden="true"><span class="octicon octicon-link"></span></a>hydra</h2> <p>Hydra is a distributed data processing and storage system originally developed at <a href="https://web.archive.org/web/20141121074123/http://www.addthis.com/">AddThis</a>. It ingests streams of data (think log files) and builds trees that are aggregates, summaries, or transformations of the data. These trees can be used by humans to explore (tiny queries), as part of a machine learning pipeline (big queries), or to support live consoles on websites (lots of queries).</p> <p>You can run hydra from the command line to slice and dice that Apache access log you have sitting around (or that gargantuan csv file). Or if terabytes per day is your cup of tea run a Hydra Cluster that supports your job with resource sharing, job management, distributed backups, data partitioning, and efficient bulk file transfer.</p> <h2> <a id="user-content-documentation-and-references" class="anchor" href="#documentation-and-references" aria-hidden="true"><span class="octicon octicon-link"></span></a>Documentation and References</h2> <p><a href="https://web.archive.org/web/20141121074123/http://oss-docs.addthiscode.net/hydra/latest/user-guide/index.html">The Hydra Documentation Page</a> contains concepts, tutorials, guides, and the web api.</p> <p><a href="https://web.archive.org/web/20141121074123/http://oss-docs.clearspring.com/hydra/latest/user-reference/">The Hydra User Reference</a> is built automatically from the source code and contains reference material on hydra's configurable job components.</p> <p><a href="https://web.archive.org/web/20141121074123/https://www.addthis.com/blog/2014/02/18/getting-started-with-hydra">Getting Started With Hydra</a> is a blog post that contains a nice self-contained introduction to hydra processing.</p> <p><a href="https://web.archive.org/web/20141121074123/http://oss-docs.addthiscode.net/hydra/latest/user-guide/guide/standards.html">AddThis Java Code Style</a> is the code style that hydra tries to adhere to.</p> <h2> <a id="user-content-building" class="anchor" href="#building" aria-hidden="true"><span class="octicon octicon-link"></span></a>Building</h2> <p>Assuming you have <a href="https://web.archive.org/web/20141121074123/http://maven.apache.org/">Apache Maven</a> installed and configured:</p> <pre><code>mvn package </code></pre> <p>Should compile and build jars. All hydra dependencies should be available on maven central but hydra itself is not yet published.</p> <p><a href="https://web.archive.org/web/20141121074123/http://www.oracle.com/technetwork/database/berkeleydb/overview/index-093405.html">Berkeley DB Java Edition</a> is used for several core features. The sleepycat license has strong copyleft properties that do not match the rest of the project. It is set as a non-transitive dependency to avoid inadvertently pulling it into downstream projects. In the future hydra should have pluggable storage with multiple implementations.</p> <p>The <code>hydra-uber</code> module builds an <code>exec</code> jar containing hydra and all of it's dependencies. To include BDB JE when building with <code>mvn package</code> use <code>-P bdbje</code>. The main class of the <code>exec</code> jar launches the various components of a hydra cluster by name.</p> <h2> <a id="user-content-system-dependencies" class="anchor" href="#system-dependencies" aria-hidden="true"><span class="octicon octicon-link"></span></a>System dependencies</h2> <p>JDK 8 is required. Hydra has been developed on Linux (Centos 6) and should work on any modern Linux distro. Other unix-like systems should work with minor changes but have not been tested. Mac OSX should work for building and running local-stack (see below).</p> <p>Hydra uses <a href="https://web.archive.org/web/20141121074123/http://www.rabbitmq.com/">rabbitmq</a> for low volume command and control message exchange. On a modern Linux systems <code>apt-get install rabbitmq-server</code> and running with the default settings is adequate in most cases.</p> <p>To run efficiently Hydra needs a mechanism to take copy on write backups of the output of jobs. The is currently accomplished by adding the <a href="https://web.archive.org/web/20141121074123/http://xmailserver.org/flcow.html">fl-cow</a> library to <code>LD_PRELOAD</code>. Experimenting with other approaches such as ZFS or <code>cp --reflink</code> are under consideration.</p> <p>Many components assume that there is a local user called <code>hydra</code> and that all minion nodes can ssh as that user to each other. This is used most prominently for <code>rsync</code> based replicas. The user <code>hydra</code> is not necessary when running a local-stack environment (see below).</p> <h3> <a id="user-content-os-x" class="anchor" href="#os-x" aria-hidden="true"><span class="octicon octicon-link"></span></a>OS X</h3> <p>On OS X several utilities are necessary to run the local-stack environment:</p> <pre><code>brew install coreutils brew install wget </code></pre> <h2> <a id="user-content-components" class="anchor" href="#components" aria-hidden="true"><span class="octicon octicon-link"></span></a>Components</h2> <p>While hydra can be used for ad-hoc analysis of csv and other local files, it's most commonly used in a distributed cluster. In that case the following components are involved:</p> <ul> <li><a href="https://web.archive.org/web/20141121074123/http://zookeeper.apache.org/">ZooKeeper</a></li> <li>Spawn: Job control and execution</li> <li>Minion: Task runner</li> <li>QueryMaster: Handler for queries</li> <li>QueryWorker: Handle scatter-gather requests from QueryMaster</li> <li>Meshy: File server</li> </ul> <p>A typical configuration is to have a cluster head with Spawn & QueryMaster backed by a homogeneous clusters of nodes running Minion, QueryWorker, and Meshy.</p> <h2> <a id="user-content-local-stack" class="anchor" href="#local-stack" aria-hidden="true"><span class="octicon octicon-link"></span></a>Local Stack</h2> <p>For local development all of the above components can run together in a single stack run out of <code>hydra-local</code>. There is a <code>local-stack.sh</code> script to assist with this. To run the local stack:</p> <ul> <li>You must be able to build hydra</li> <li>Have rabbitmq installed</li> <li>Allow your current user to ssh to itself</li> </ul> <p>The first time the script is run a <code>hydra-local</code> directory will be created.</p> <ul> <li> <code>./hydra-uber/bin/local-stack.sh start</code> - start ZooKeeper</li> <li> <code>./hydra-uber/bin/local-stack.sh start</code> - start spawn, querymaster etc.</li> <li> <code>./hydra-uber/bin/local-stack.sh seed</code> - add some sample data</li> </ul> <p>You can then navigate to http://localhost:5052/ and you should see the spawn web interface.</p> <p>When done <code>./hydra-uber/bin/local-stack.sh stop</code> will stop everything except ZooKeeper, and running <code>stop</code> a second time will bring that process down as well.</p> <p>There are sample job configurations located in <code>hydra-uber/local/sample/</code></p> <h2> <a id="user-content-administrative" class="anchor" href="#administrative" aria-hidden="true"><span class="octicon octicon-link"></span></a>Administrative</h2> <h3> <a id="user-content-discussion" class="anchor" href="#discussion" aria-hidden="true"><span class="octicon octicon-link"></span></a>Discussion</h3> <p>Mailing list: <a href="https://web.archive.org/web/20141121074123/http://groups.google.com/group/hydra-oss">http://groups.google.com/group/hydra-oss</a></p> <p><a href="https://web.archive.org/web/20141121074123/http://freenode.net/">Freenode</a> channel: <code>#hydra</code></p> <h3> <a id="user-content-versioning" class="anchor" href="#versioning" aria-hidden="true"><span class="octicon octicon-link"></span></a>Versioning</h3> <p>It's x.y.z where:</p> <ul> <li>x: Something Big Happened</li> <li>y: next release</li> <li>z: strive for bug fix only</li> </ul> <h3> <a id="user-content-license" class="anchor" href="#license" aria-hidden="true"><span class="octicon octicon-link"></span></a>License</h3> <p>hydra is released under the Apache License Version 2.0. See <a href="https://web.archive.org/web/20141121074123/http://www.apache.org/licenses/LICENSE-2.0">Apache</a> or the LICENSE file in this distribution for details.</p> </article> </div> </div> </div> <div class="modal-backdrop"></div> </div> </div> </div> <div class="container"> <div class="site-footer" role="contentinfo"> <ul class="site-footer-links right"> <li><a href="https://web.archive.org/web/20141121074123/https://status.github.com/">Status</a></li> <li><a href="https://web.archive.org/web/20141121074123/https://developer.github.com/">API</a></li> <li><a href="https://web.archive.org/web/20141121074123/http://training.github.com/">Training</a></li> <li><a href="https://web.archive.org/web/20141121074123/http://shop.github.com/">Shop</a></li> <li><a href="/web/20141121074123/https://github.com/blog">Blog</a></li> <li><a href="/web/20141121074123/https://github.com/about">About</a></li> </ul> <a href="/web/20141121074123/https://github.com/" aria-label="Homepage"> <span class="mega-octicon octicon-mark-github" title="GitHub"></span> </a> <ul class="site-footer-links"> <li>© 2014 <span title="0.04255s from github-fe122-cp1-prd.iad.github.net">GitHub</span>, Inc.</li> <li><a href="/web/20141121074123/https://github.com/site/terms">Terms</a></li> <li><a href="/web/20141121074123/https://github.com/site/privacy">Privacy</a></li> <li><a href="/web/20141121074123/https://github.com/security">Security</a></li> <li><a href="/web/20141121074123/https://github.com/contact">Contact</a></li> </ul> </div> </div> <div class="fullscreen-overlay js-fullscreen-overlay" id="fullscreen_overlay"> <div class="fullscreen-container js-suggester-container"> <div class="textarea-wrap"> <textarea name="fullscreen-contents" id="fullscreen-contents" class="fullscreen-contents js-fullscreen-contents js-suggester-field" placeholder=""></textarea> </div> </div> <div class="fullscreen-sidebar"> <a href="#" class="exit-fullscreen js-exit-fullscreen tooltipped tooltipped-w" aria-label="Exit Zen Mode"> <span class="mega-octicon octicon-screen-normal"></span> </a> <a href="#" class="theme-switcher js-theme-switcher tooltipped tooltipped-w" aria-label="Switch themes"> <span class="octicon octicon-color-mode"></span> </a> </div> </div> <div id="ajax-error-message" class="flash flash-error"> <span class="octicon octicon-alert"></span> <a href="#" class="octicon octicon-x flash-close js-ajax-error-dismiss" aria-label="Dismiss error"></a> Something went wrong with that request. 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