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itemprop="datePublished">January 20, 2023</time> · <!-- -->4 min read</div></div></header><div id="post-content" class="markdown" itemprop="articleBody"><p>The Apache Pulsar community releases version 2.11! 61 contributors provided feature enhancements and fixes that delivered 1617 commits. Thanks for all your contributions.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="highlights-of-the-211-release">Highlights of the 2.11 release<a href="#highlights-of-the-211-release" class="hash-link" aria-label="Direct link to Highlights of the 2.11 release" title="Direct link to Highlights of the 2.11 release"></a></h2><ul><li>Upgrade Pulsar server Java build version to 17 (<a href="https://github.com/apache/pulsar/issues/15207" target="_blank" rel="noopener noreferrer">PIP-156</a>)</li><li>Support chunking with shared subscriptions (<a href="https://github.com/apache/pulsar/pull/16202" target="_blank" rel="noopener noreferrer">PR-16202</a>)</li><li>Support pluggable topic factory (<a href="https://github.com/apache/pulsar/pull/12235" target="_blank" rel="noopener noreferrer">PR-12235</a>)</li><li>Support configurable compression type for <code>ManagedCursorInfo</code> to balance storage resource usage (<a href="https://github.com/apache/pulsar/pull/14542" target="_blank" rel="noopener noreferrer">PR-14542</a>)</li></ul><p>This blog documents the most noteworthy changes in this release. For the complete list, including all feature enhancements and bug fixes, check out the <a href="https://pulsar.apache.org/release-notes/versioned/pulsar-2.11.0/" target="_blank" rel="noopener noreferrer">Pulsar 2.11 Release Notes</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="notable-feature-enhancements-and-fixes">Notable feature enhancements and fixes<a href="#notable-feature-enhancements-and-fixes" class="hash-link" aria-label="Direct link to Notable feature enhancements and fixes" title="Direct link to Notable feature enhancements and fixes"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="broker">Broker<a href="#broker" class="hash-link" aria-label="Direct link to Broker" title="Direct link to Broker"></a></h3><hr><h4 class="anchor anchorWithStickyNavbar_LWe7" id="store-subscription-properties-within-metadata-service-pr-15757">Store subscription properties within metadata service (<a href="https://github.com/apache/pulsar/pull/15757" target="_blank" rel="noopener noreferrer">PR-15757</a>)<a href="#store-subscription-properties-within-metadata-service-pr-15757" class="hash-link" aria-label="Direct link to store-subscription-properties-within-metadata-service-pr-15757" title="Direct link to store-subscription-properties-within-metadata-service-pr-15757"></a></h4><p><strong>Issue</strong></p><p>Restarting the broker or unloading topics may lead to the loss of subscription properties since they are not stored in the metadata service.</p><p><strong>Resolution</strong></p><p>Store the subscription properties within the metadata service (<code>ManagedCursorInfo</code>).</p><hr><h4 class="anchor anchorWithStickyNavbar_LWe7" id="support-configurable-compression-type-for-managedcursorinfo-pr-14542">Support configurable compression type for <code>ManagedCursorInfo</code> (<a href="https://github.com/apache/pulsar/pull/14542" target="_blank" rel="noopener noreferrer">PR-14542</a>)<a href="#support-configurable-compression-type-for-managedcursorinfo-pr-14542" class="hash-link" aria-label="Direct link to support-configurable-compression-type-for-managedcursorinfo-pr-14542" title="Direct link to support-configurable-compression-type-for-managedcursorinfo-pr-14542"></a></h4><p><strong>Issue</strong></p><p>When the cursor data expands, the data size increases and it takes a lot of time to pull the data.</p><p><strong>Resolution</strong></p><p>Introduce various compression algorithms to support cursor compression.</p><p><strong>Reference documentation:</strong> <a href="https://pulsar.apache.org/reference/#/2.11.x/config/reference-configuration-broker?id=managedcursorinfocompressiontype" target="_blank" rel="noopener noreferrer">managedCursorInfoCompressionType</a></p><hr><h4 class="anchor anchorWithStickyNavbar_LWe7" id="sync-pulsar-metadata-across-multiple-clouds-pr-16425">Sync Pulsar metadata across multiple clouds (<a href="https://github.com/apache/pulsar/pull/16425" target="_blank" rel="noopener noreferrer">PR-16425</a>)<a href="#sync-pulsar-metadata-across-multiple-clouds-pr-16425" class="hash-link" aria-label="Direct link to sync-pulsar-metadata-across-multiple-clouds-pr-16425" title="Direct link to sync-pulsar-metadata-across-multiple-clouds-pr-16425"></a></h4><p><strong>Issue</strong></p><p>Synchronizing configuration metadata (policies) is a critical path to sharing tenant/namespace/topic policies among clusters and administering policies uniformly across all clusters. However, syncing the metadata store (global zookeeper) among Pulsar clusters deployed on separate cloud platforms is not supported in earlier versions.</p><p><strong>Resolution</strong></p><p>Use two system topics <code>metadataSyncEventTopic</code> and <code>configurationmetadataSyncEventTopic</code> along with a metadata synchronizer to sync metadata among clusters deployed on different cloud platforms and persist local topic policies with it.</p><p><strong>Reference documentation</strong></p><ul><li><a href="https://pulsar.apache.org/reference/#/2.11.x/config/reference-configuration-broker?id=metadatasynceventtopic" target="_blank" rel="noopener noreferrer">metadataSyncEventTopic</a></li><li><a href="https://pulsar.apache.org/reference/#/2.11.x/config/reference-configuration-broker?id=configurationmetadatasynceventtopic" target="_blank" rel="noopener noreferrer">configurationmetadataSyncEventTopic</a></li></ul><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="producer">Producer<a href="#producer" class="hash-link" aria-label="Direct link to Producer" title="Direct link to Producer"></a></h3><hr><h4 class="anchor anchorWithStickyNavbar_LWe7" id="fix-client-memory-limit-currentusage-leak-in-producerimpl-pr-16837">Fix client memory limit <code>currentUsage</code> leak in <code>ProducerImpl</code> (<a href="https://github.com/apache/pulsar/pull/16837" target="_blank" rel="noopener noreferrer">PR-16837</a>)<a href="#fix-client-memory-limit-currentusage-leak-in-producerimpl-pr-16837" class="hash-link" aria-label="Direct link to fix-client-memory-limit-currentusage-leak-in-producerimpl-pr-16837" title="Direct link to fix-client-memory-limit-currentusage-leak-in-producerimpl-pr-16837"></a></h4><p><strong>Issue</strong></p><p>The client memory limit <code>currentUsage</code> leaks in <code>ProducerImpl</code> and causes the producer’s send rate to be slow.</p><p><strong>Resolution</strong></p><p>Release the memory when there are failed pending batch messages.</p><hr><h4 class="anchor anchorWithStickyNavbar_LWe7" id="release-semaphore-before-discarding-messages-in-batchmessagecontainer-pr-17019">Release semaphore before discarding messages in <code>batchMessageContainer</code> (<a href="https://github.com/apache/pulsar/pull/17019" target="_blank" rel="noopener noreferrer">PR-17019</a>)<a href="#release-semaphore-before-discarding-messages-in-batchmessagecontainer-pr-17019" class="hash-link" aria-label="Direct link to release-semaphore-before-discarding-messages-in-batchmessagecontainer-pr-17019" title="Direct link to release-semaphore-before-discarding-messages-in-batchmessagecontainer-pr-17019"></a></h4><p><strong>Issue</strong></p><p>There is a race condition in <code>batchMessageContainer</code> when discarding the messages and releasing the semaphore, which causes the semaphore to be held.</p><p><strong>Resolution</strong></p><p>Release the semaphore before discarding the messages in <code>batchMessageContainer</code>.</p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="consumer">Consumer<a href="#consumer" class="hash-link" aria-label="Direct link to Consumer" title="Direct link to Consumer"></a></h3><hr><h4 class="anchor anchorWithStickyNavbar_LWe7" id="support-consumer-client-memory-limit-pr-15216">Support consumer client memory limit (<a href="https://github.com/apache/pulsar/pull/15216" target="_blank" rel="noopener noreferrer">PR-15216</a>)<a href="#support-consumer-client-memory-limit-pr-15216" class="hash-link" aria-label="Direct link to support-consumer-client-memory-limit-pr-15216" title="Direct link to support-consumer-client-memory-limit-pr-15216"></a></h4><p><strong>Issue</strong></p><p>It takes time for an application with a large number of producers/consumers to select an appropriate value for its queue size. The same applies to topics with many partitions.</p><p><strong>Resolution</strong></p><ol><li>Block the expansion of the consumer receiver’s queue size if the memory usage exceeds 75%.</li><li>Trigger the shrinking of the consumer receiver’s queue size if the memory usage exceeds 95%.</li></ol><hr><h4 class="anchor anchorWithStickyNavbar_LWe7" id="support-adding-interceptors-for-readers-pr-14729">Support adding interceptors for readers (<a href="https://github.com/apache/pulsar/pull/14729" target="_blank" rel="noopener noreferrer">PR-14729</a>)<a href="#support-adding-interceptors-for-readers-pr-14729" class="hash-link" aria-label="Direct link to support-adding-interceptors-for-readers-pr-14729" title="Direct link to support-adding-interceptors-for-readers-pr-14729"></a></h4><p><strong>Issue</strong></p><p>Pulsar supports adding interceptors for producers and consumers to implement message tracing, but there is no way to add interceptors for readers.</p><p><strong>Resolution</strong></p><ol><li>Add a new interface <code>ReaderInterceptor</code> to customize the reader interceptor.</li><li>Support setting reader interceptor and auto-update partition configurations by using <code>ReaderBuilder</code>.</li></ol><p><strong>User documentation:</strong> <a href="https://pulsar.apache.org/docs/2.11.x/client-libraries-java/#create-reader-with-interceptor" target="_blank" rel="noopener noreferrer">Create a reader with an interceptor</a></p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="function">Function<a href="#function" class="hash-link" aria-label="Direct link to Function" title="Direct link to Function"></a></h3><hr><h4 class="anchor anchorWithStickyNavbar_LWe7" id="support-record-as-a-new-output-type-of-functions-pr-16041">Support <code>Record</code> as a new output type of Functions (<a href="https://github.com/apache/pulsar/pull/16041" target="_blank" rel="noopener noreferrer">PR-16041</a>)<a href="#support-record-as-a-new-output-type-of-functions-pr-16041" class="hash-link" aria-label="Direct link to support-record-as-a-new-output-type-of-functions-pr-16041" title="Direct link to support-record-as-a-new-output-type-of-functions-pr-16041"></a></h4><p><strong>Issue</strong></p><p>In earlier versions, if you want to dynamically set an output topic, message properties, or change the output schema in a Pulsar function, the only way is to create a function that returns <code>Void</code>. It would be more intuitive to return a structure like <code>Record</code> that carries this information.</p><p><strong>Resolution</strong></p><p>Add a utility method <code>newOutputRecordBuilder</code> to <code>Context</code> that returns a <code>FunctionRecord</code> builder initialized with the information from the source record. The builder methods can be used to override these values as needed.</p><p><strong>User documentation:</strong> <a href="https://pulsar.apache.org/docs/2.11.x/functions-develop-api#use-sdk-for-javapythongo" target="_blank" rel="noopener noreferrer">Use <code>Record</code> as function output</a></p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="tiered-storage">Tiered storage<a href="#tiered-storage" class="hash-link" aria-label="Direct link to Tiered storage" title="Direct link to Tiered storage"></a></h3><hr><h4 class="anchor anchorWithStickyNavbar_LWe7" id="add-a-universal-s3-provider-for-the-offloader-pr-15710">Add a universal S3 provider for the offloader (<a href="https://github.com/apache/pulsar/pull/15710" target="_blank" rel="noopener noreferrer">PR-15710</a>)<a href="#add-a-universal-s3-provider-for-the-offloader-pr-15710" class="hash-link" aria-label="Direct link to add-a-universal-s3-provider-for-the-offloader-pr-15710" title="Direct link to add-a-universal-s3-provider-for-the-offloader-pr-15710"></a></h4><p><strong>Issue</strong></p><p>Pulsar supports cloud storage compatible with S3 APIs, such as AWS and Aliyun, through existing offloaders, but the forced registration of specific metadata limits their use.</p><p><strong>Resolution</strong></p><p>Provide a more general offloader <code>S3</code> to serve more S3-compatible storage, which uses pure JClouds S3 metadata and allows overriding the default JClouds properties through system properties.</p><p><strong>User documentation:</strong> <a href="https://pulsar.apache.org/docs/2.11.x/tiered-storage-s3" target="_blank" rel="noopener noreferrer">Use S3 offloader with Pulsar</a></p><hr><h3 class="anchor anchorWithStickyNavbar_LWe7" id="proxy">Proxy<a href="#proxy" class="hash-link" aria-label="Direct link to Proxy" title="Direct link to Proxy"></a></h3><hr><h4 class="anchor anchorWithStickyNavbar_LWe7" id="support-prometheusrawmetricsprovider-for-pulsar-proxies-pr-14681">Support <code>PrometheusRawMetricsProvider</code> for Pulsar proxies (<a href="https://github.com/apache/pulsar/pull/14681" target="_blank" rel="noopener noreferrer">PR-14681</a>)<a href="#support-prometheusrawmetricsprovider-for-pulsar-proxies-pr-14681" class="hash-link" aria-label="Direct link to support-prometheusrawmetricsprovider-for-pulsar-proxies-pr-14681" title="Direct link to support-prometheusrawmetricsprovider-for-pulsar-proxies-pr-14681"></a></h4><p><strong>Issue</strong></p><p>The metrics of plugins could not be exposed to Prometheus for monitoring.</p><p><strong>Resolution</strong></p><p>Add <code>PrometheusRawMetricsProvider</code> in Pulsar proxies so that plugins can add their metrics to Prometheus.</p><hr><h2 class="anchor anchorWithStickyNavbar_LWe7" id="whats-next">What’s Next?<a href="#whats-next" class="hash-link" aria-label="Direct link to What’s Next?" title="Direct link to What’s Next?"></a></h2><p>If you are interested in learning more about Pulsar 2.11, you can <a href="https://pulsar.apache.org/download/" target="_blank" rel="noopener noreferrer">download</a> and try it out now!</p><p>For more information about the Apache Pulsar project and current progress, visit |
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