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content=1><li itemscope itemprop=itemListElement itemtype=https://schema.org/ListItem class="breadcrumbs__item breadcrumbs__item--active"><span class=breadcrumbs__link itemprop=name>Aiven for Apache Flink®</span><meta itemprop=position content=2></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type=button class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Aiven for Apache Flink®   </h1></header><div class="theme-admonition theme-admonition-note admonition_xJq3 alert alert--secondary"><div class=admonitionHeading_Gvgb><span class=admonitionIcon_Rf37><svg viewBox="0 0 14 16"><path fill-rule=evenodd d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"/></svg></span>note</div><div class=admonitionContent_BuS1><p><strong>Aiven for Apache Flink® service creation is limited</strong><p>Creating a new Aiven for Apache Flink® service is currently limited. If your organization does not have access to create an Aiven for Apache Flink service, open a <a href=/docs/platform/howto/support#create-a-support-ticket>support ticket</a> or contact <a href=mailto:support@aiven.io target=_blank rel="noopener noreferrer">Aiven Support</a> for assistance.</div></div> <p>Aiven for Apache Flink® is a fully managed service that leverages the power of the <a href=https://flink.apache.org/ target=_blank rel="noopener noreferrer">open-source Apache Flink framework</a> to provide distributed, stateful stream processing capabilities, allowing users to perform real-time computation with SQL efficiently.</p> <h2 class="anchor anchorWithStickyNavbar_LWe7" id=main-features>Main features<a href=#main-features class=hash-link aria-label="Direct link to Main features" title="Direct link to Main features"></a></h2> <h3 class="anchor anchorWithStickyNavbar_LWe7" id=flink-sql>Flink SQL<a href=#flink-sql class=hash-link aria-label="Direct link to Flink SQL" title="Direct link to Flink SQL"></a></h3> <p>Apache Flink allows you to develop streaming applications using standard SQL. Aiven for Apache Flink is a fully managed service that provides various features for developing and running streaming applications using Flink on the Aiven platform. One of these features is the SQL editor, which is a built-in feature of the Aiven Console.</p> <p>The built-in SQL editor allows you to create and test Flink SQL queries, explore the table schema of your data streams and tables, and deploy queries to your streaming application. This makes it easy to develop and maintain streaming applications using Flink SQL on the Aiven platform.</p> <h3 class="anchor anchorWithStickyNavbar_LWe7" id=build-applications-to-process-data>Build applications to process data<a href=#build-applications-to-process-data class=hash-link aria-label="Direct link to Build applications to process data" title="Direct link to Build applications to process data"></a></h3> <p>An <a href=/docs/products/flink/concepts/flink-applications>Aiven for Apache Flink® Application</a> is an abstraction layer on top of Apache Flink SQL that includes all the elements related to a Flink job to help build your data processing pipeline. It contains all the components related to a Flink job, including the definition of source and sink tables, data processing logic, deployment parameters, and other relevant metadata.</p> <p>Applications are the starting point for running an Apache Flink job within the Aiven managed service. The <a href=https://console.aiven.io/ target=_blank rel="noopener noreferrer">Aiven Console</a> provides a user-friendly, guided wizard to help you build and deploy applications, create source and sink tables, write transformation statements, and validate and ingest data using the interactive query feature.</p> <h3 class="anchor anchorWithStickyNavbar_LWe7" id=interactive-queries>Interactive queries<a href=#interactive-queries class=hash-link aria-label="Direct link to Interactive queries" title="Direct link to Interactive queries"></a></h3> <p>The <a href=/docs/products/flink/concepts/supported-syntax-sql-editor>interactive query</a> feature in Aiven for Apache Flink grants the ability to preview the data of a Flink table or job without outputting the rows to a sink table like Apache Kafka®. This can be useful for testing and debugging purposes, as it allows you to examine the data being processed by your <a href=/docs/products/flink/concepts/flink-applications>Flink application</a>.</p> <h3 class="anchor anchorWithStickyNavbar_LWe7" id=built-in-data-flow-integration-with-aiven-for-apache-kafka>Built-in data flow integration with Aiven for Apache Kafka®<a href=#built-in-data-flow-integration-with-aiven-for-apache-kafka class=hash-link aria-label="Direct link to Built-in data flow integration with Aiven for Apache Kafka®" title="Direct link to Built-in data flow integration with Aiven for Apache Kafka®"></a></h3> <p>Aiven for Apache Flink provides built-in data flow integration with <a href=/docs/products/kafka>Aiven for Apache Kafka®</a>, allowing you to connect your Flink streaming applications with Apache Kafka as a source or sink for your data.</p> <ul> <li>When you create data tables in Aiven for Apache Flink, the service provides auto-completion for finding existing topics in a connected Kafka service.</li> <li>You can also choose the table format when reading data from Kafka, including JSON, Apache Avro, Confluent Avro, and Debezium CDC.</li> <li>Aiven for Apache Flink also supports upsert Kafka connectors, which allow you to produce a changelog stream where each data record represents an update or delete an event. This can be useful for maintaining data consistency in real-time streaming applications that involve complex data transformations or updates.</li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id=built-in-data-flow-integration-with-aiven-for-postgresql>Built-in data flow integration with Aiven for PostgreSQL®<a href=#built-in-data-flow-integration-with-aiven-for-postgresql class=hash-link aria-label="Direct link to Built-in data flow integration with Aiven for PostgreSQL®" title="Direct link to Built-in data flow integration with Aiven for PostgreSQL®"></a></h3> <p>Aiven for Apache Flink provides built-in data flow integration with <a href=/docs/products/postgresql>Aiven for PostgreSQL</a>, allowing you to connect your Flink streaming applications with PostgreSQL as a source or sink for your data.</p> <p>When you create data tables in Aiven for Apache Flink, the service provides auto-completion for finding existing databases in a connected PostgreSQL service. This makes it easy to select the appropriate database and table when configuring your Flink streaming application to read or write data from PostgreSQL.</p> <h3 class="anchor anchorWithStickyNavbar_LWe7" id=automate-workflows-with-terraform>Automate workflows with Terraform<a href=#automate-workflows-with-terraform class=hash-link aria-label="Direct link to Automate workflows with Terraform" title="Direct link to Automate workflows with Terraform"></a></h3> <p>Aiven for Apache Flink provides integration with the <a href=/docs/tools/terraform>Aiven Terraform Provider</a>, which allows you to automate workflows for managing Flink services on the Aiven platform.</p> <p>To use the Aiven Terraform Provider to automate workflows for managing Flink services, you can reference the Flink data source in your Terraform configuration files.</p> <h3 class="anchor anchorWithStickyNavbar_LWe7" id=disaster-recovery>Disaster recovery<a href=#disaster-recovery class=hash-link aria-label="Direct link to Disaster recovery" title="Direct link to Disaster recovery"></a></h3> <p>Periodic checkpoints have been configured to be persisted externally in object storage. They allow Flink to recover states and positions in the streams by giving the application the same semantics as a failure-free execution. See <a href=/docs/products/flink/concepts/checkpoints>Checkpoints</a>.</p> <h2 class="anchor anchorWithStickyNavbar_LWe7" id=cluster-management>Cluster management<a href=#cluster-management class=hash-link aria-label="Direct link to Cluster management" title="Direct link to Cluster management"></a></h2> <h3 class="anchor anchorWithStickyNavbar_LWe7" id=cluster-deployment-mode>Cluster deployment mode<a href=#cluster-deployment-mode class=hash-link aria-label="Direct link to Cluster deployment mode" title="Direct link to Cluster deployment mode"></a></h3> <p>Aiven for Apache Flink® is configured to use the <a href=https://ci.apache.org/projects/flink/flink-docs-stable/api/java/org/apache/flink/runtime/state/hashmap/HashMapStateBackend.html target=_blank rel="noopener noreferrer">HashMap state backend</a>. This means that the <a href=https://nightlies.apache.org/flink/flink-docs-stable/docs/concepts/stateful-stream-processing/#what-is-state target=_blank rel="noopener noreferrer">state</a> is stored in memory, which can impact the performance of jobs that require keeping a very large state. We recommend you provision your platform accordingly.</p> <p>The Flink cluster executes applications in <a href=https://nightlies.apache.org/flink/flink-docs-stable/docs/deployment/overview/#session-mode target=_blank rel="noopener noreferrer">session mode</a> so you can deploy multiple Flink jobs on the same cluster and maximize resource use.</p> <h3 class="anchor anchorWithStickyNavbar_LWe7" id=cluster-scaling>Cluster scaling<a href=#cluster-scaling class=hash-link aria-label="Direct link to Cluster scaling" title="Direct link to Cluster scaling"></a></h3> <p>Each node is equipped with a TaskManager and JobManager. We recommend scaling up your cluster to add more CPU and memory for the TaskManager before attempting to scale out, so you make the best use of the resources with a minimum number of nodes.</p> <p>By default, each TaskManager is configured with a single slot for maximum job isolation. It is highly recommended that you modify this option to match your requirements.</p> <div class="theme-admonition theme-admonition-warning admonition_xJq3 alert alert--warning"><div class=admonitionHeading_Gvgb><span class=admonitionIcon_Rf37><svg viewBox="0 0 16 16"><path fill-rule=evenodd d="M8.893 1.5c-.183-.31-.52-.5-.887-.5s-.703.19-.886.5L.138 13.499a.98.98 0 0 0 0 1.001c.193.31.53.501.886.501h13.964c.367 0 .704-.19.877-.5a1.03 1.03 0 0 0 .01-1.002L8.893 1.5zm.133 11.497H6.987v-2.003h2.039v2.003zm0-3.004H6.987V5.987h2.039v4.006z"/></svg></span>warning</div><div class=admonitionContent_BuS1><p>Adjusting the task slots per TaskManager requires a cluster restart.</div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id=cluster-restart-strategy>Cluster restart strategy<a href=#cluster-restart-strategy class=hash-link aria-label="Direct link to Cluster restart strategy" title="Direct link to Cluster restart strategy"></a></h3> <p>The default restart strategy of the cluster is set to <code>Failure Rate</code>. This controls how Apache Flink restarts in case of failures during job execution. Administrators can change this setting in the advanced configuration options of the service.</p> <p>For more information on available options, refer to <a href=https://nightlies.apache.org/flink/flink-docs-master/docs/deployment/config/#fault-tolerance target=_blank rel="noopener noreferrer">Apache Flink fault tolerance</a> documentation.</p> <h3 class="anchor anchorWithStickyNavbar_LWe7" id=cluster-logging-metrics-and-alerting>Cluster logging, metrics, and alerting<a href=#cluster-logging-metrics-and-alerting class=hash-link aria-label="Direct link to Cluster logging, metrics, and alerting" title="Direct link to Cluster logging, metrics, and alerting"></a></h3> <p>Log and metrics integration to Aiven services are available for administrators to configure so you can monitor the health of your service.</p> <p>By enabling these integrations, you can:</p> <ul> <li>Push service logs into an index in <a href=/docs/products/opensearch>Aiven for OpenSearch®</a>.</li> <li>Push service metrics to <a href=/docs/products/m3db>M3®</a> or <a href=/docs/products/postgresql>PostgreSQL®</a> services on Aiven.</li> <li>Create custom OpenSearch or <a href=/docs/products/grafana>Grafana®</a> dashboards to monitor the service.</li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id=cluster-security-considerations>Cluster security considerations<a href=#cluster-security-considerations class=hash-link aria-label="Direct link to Cluster security considerations" title="Direct link to Cluster security considerations"></a></h3> <p>All services run on a dedicated virtual machine with end-to-end encryption, and all nodes are firewall-protected. The credentials used for data flow integrations between Flink and other Aiven services have read/write permissions on the clusters.</p> <p>You can set up separate clusters for writing processed data from Flink and restrict access if you need more strict access management than our default setup offers. This also minimizes the risk of accidental write events to the source cluster.</p> <p class=title_OprQ>Related pages</p> <ul> <li><a href=https://aiven.io/flink target=_blank rel="noopener noreferrer">Aiven.io</a></li> </ul></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class=col><a href=https://github.com/aiven/aiven-docs/blob/main/docs/products/flink.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_Z9Sw aria-hidden=true><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"/></g></svg>Edit this page</a></div><div class="col lastUpdated_JAkA"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href=/docs/products/cassandra/reference/cassandra-metrics-datadog><div class=pagination-nav__sublabel>Previous</div><div class=pagination-nav__label>Aiven for Apache Cassandra® metrics available via Datadog</div></a><a class="pagination-nav__link pagination-nav__link--next" href=/docs/products/flink/get-started><div class=pagination-nav__sublabel>Next</div><div class=pagination-nav__label>Get started</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href=#main-features class="table-of-contents__link toc-highlight">Main features</a><ul><li><a href=#flink-sql class="table-of-contents__link toc-highlight">Flink SQL</a><li><a href=#build-applications-to-process-data class="table-of-contents__link toc-highlight">Build applications to process data</a><li><a href=#interactive-queries class="table-of-contents__link toc-highlight">Interactive 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