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datetime="2023-04-19T00:00:00.000Z" itemprop="datePublished">April 19, 2023</time> · <!-- -->3 min read</div></div></header><div id="post-content" class="markdown" itemprop="articleBody"><p>The Apache Pulsar community releases version 2.10.4! 37 contributors provided improvements and bug fixes that delivered 12 commits. Thanks for all your contributions.</p><p>This blog walks through the most noteworthy changes. For the complete list, including all feature enhancements and bug fixes, check out the <a href="https://pulsar.apache.org/release-notes/versioned/pulsar-2.10.4/" target="_blank" rel="noopener noreferrer">Pulsar 2.10.4 Release Notes</a>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="improve-performance-in-key_shared-subscriptions-pr-19167">Improve performance in Key_Shared subscriptions (<a href="https://github.com/apache/pulsar/pull/19167" target="_blank" rel="noopener noreferrer">PR-19167</a>)<a href="#improve-performance-in-key_shared-subscriptions-pr-19167" class="hash-link" aria-label="Direct link to improve-performance-in-key_shared-subscriptions-pr-19167" title="Direct link to improve-performance-in-key_shared-subscriptions-pr-19167"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="issue">Issue<a href="#issue" class="hash-link" aria-label="Direct link to Issue" title="Direct link to Issue"></a></h4><p>In earlier versions, Key_Shared subscriptions suffered from performance issues due to the lack of a ref count for sticky hash.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="resolution">Resolution<a href="#resolution" class="hash-link" aria-label="Direct link to Resolution" title="Direct link to Resolution"></a></h4><p>A significant performance improvement has been made to the Key_Shared subscriptions by adding a ref count for sticky hash. This optimization reduces the time required to check if messages contain the hash from a given sticky hash set, resulting in improved performance and efficiency.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="abstractbatchedmetadatastore---use-alreadyclosedexception-instead-of-illegalstateexception-pr-19284">AbstractBatchedMetadataStore - Use AlreadyClosedException instead of IllegalStateException (<a href="https://github.com/apache/pulsar/pull/19284" target="_blank" rel="noopener noreferrer">PR-19284</a>)<a href="#abstractbatchedmetadatastore---use-alreadyclosedexception-instead-of-illegalstateexception-pr-19284" class="hash-link" aria-label="Direct link to abstractbatchedmetadatastore---use-alreadyclosedexception-instead-of-illegalstateexception-pr-19284" title="Direct link to abstractbatchedmetadatastore---use-alreadyclosedexception-instead-of-illegalstateexception-pr-19284"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="issue-1">Issue<a href="#issue-1" class="hash-link" aria-label="Direct link to Issue" title="Direct link to Issue"></a></h4><p>In earlier versions, when the broker was shutting down, the <code>AbstractBatchedMetadataStore</code> would complete pending operations with a generic <code>IllegalStateException</code>. However, code dependent on the <code>MetadataStore</code> usually expected instances of <code>MetadataStoreException</code> and might not react properly to this error.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="resolution-1">Resolution<a href="#resolution-1" class="hash-link" aria-label="Direct link to Resolution" title="Direct link to Resolution"></a></h4><p>This PR improves the error handling during broker shutdown by completing pending operations with an <code>AlreadyClosedException</code> instead of <code>IllegalStateException</code>. This ensures that the dependent code responds more appropriately to the error, even if the broker is shutting down.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="fix-open-cursor-with-null-initialposition-resulting-in-the-earliest-position-pr-18416">Fix open cursor with null-initialPosition, resulting in the earliest position (<a href="https://github.com/apache/pulsar/pull/18416" target="_blank" rel="noopener noreferrer">PR-18416</a>)<a href="#fix-open-cursor-with-null-initialposition-resulting-in-the-earliest-position-pr-18416" class="hash-link" aria-label="Direct link to fix-open-cursor-with-null-initialposition-resulting-in-the-earliest-position-pr-18416" title="Direct link to fix-open-cursor-with-null-initialposition-resulting-in-the-earliest-position-pr-18416"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="issue-2">Issue<a href="#issue-2" class="hash-link" aria-label="Direct link to Issue" title="Direct link to Issue"></a></h4><p>In earlier versions, called <code>ledger.openCursor("xxx", null)</code> with a null <code>initialPosition</code> parameter would result in the cursor being set to the earliest position, causing unexpected behavior. The root cause of this issue was due to incorrect handling of the <code>initialPosition</code> in <code>ManagedLedgerImpl.java</code>.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="resolution-2">Resolution<a href="#resolution-2" class="hash-link" aria-label="Direct link to Resolution" title="Direct link to Resolution"></a></h4><p>This PR fixes the issue by ensuring that the correct initial position is used when opening a cursor with a null <code>initialPosition</code>. The code now sets the cursor to the latest position, as expected.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="add-isactive-in-managedcursorimpl-pr-19341">Add isActive in ManagedCursorImpl (<a href="https://github.com/apache/pulsar/pull/19341" target="_blank" rel="noopener noreferrer">PR-19341</a>)<a href="#add-isactive-in-managedcursorimpl-pr-19341" class="hash-link" aria-label="Direct link to add-isactive-in-managedcursorimpl-pr-19341" title="Direct link to add-isactive-in-managedcursorimpl-pr-19341"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="issue-3">Issue<a href="#issue-3" class="hash-link" aria-label="Direct link to Issue" title="Direct link to Issue"></a></h4><p>In previous versions, when there were many concurrent subscriptions in a topic, broker performance would degrade due to many io-threads waiting for the lock, synchronized (activeCursors) while calling checkBackloggedCursors.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="resolution-3">Resolution<a href="#resolution-3" class="hash-link" aria-label="Direct link to Resolution" title="Direct link to Resolution"></a></h4><p>This PR adds an <code>isActive</code> variable in <code>ManagedCursorImpl</code> to minimize the access to <code>activeCursors</code> in <code>ManagedLedgerImpl,</code> which reduces the contention on the lock and improves the broker performance with many concurrent subscriptions.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="support-deleting-partitioned-topics-with-the-keyword--partition--pr-19230">Support deleting partitioned topics with the keyword -partition- (<a href="https://github.com/apache/pulsar/pull/19230" target="_blank" rel="noopener noreferrer">PR-19230</a>)<a href="#support-deleting-partitioned-topics-with-the-keyword--partition--pr-19230" class="hash-link" aria-label="Direct link to support-deleting-partitioned-topics-with-the-keyword--partition--pr-19230" title="Direct link to support-deleting-partitioned-topics-with-the-keyword--partition--pr-19230"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="issue-4">Issue<a href="#issue-4" class="hash-link" aria-label="Direct link to Issue" title="Direct link to Issue"></a></h4><p>In earlier versions, although users could create partitioned topics using the client when partitioned type auto-creation was enabled, there was no support for deleting these partitioned topics.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="resolution-4">Resolution<a href="#resolution-4" class="hash-link" aria-label="Direct link to Resolution" title="Direct link to Resolution"></a></h4><p>This PR adds support for deleting partitioned topics using the keyword <code>-partition-</code>, making it easier for users to manage their partitioned topics.</p><h1>What’s Next?</h1><p>If you are interested in learning more about Pulsar 2.10.4, 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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