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datetime="2021-12-14T00:00:00.000Z" itemprop="datePublished">December 14, 2021</time> · <!-- -->5 min read</div></div></header><div id="post-content" class="markdown" itemprop="articleBody"><p>The Apache Pulsar community releases version 2.7.4! 32 contributors provided improvements and bug fixes that delivered 98 commits.</p><p>Highlights of this release are as below:</p><ul><li><p>Upgrade Log4j to 2.17.0 - <a href="https://pulsar.apache.org/blog/2021/12/11/Log4j-CVE/" target="_blank" rel="noopener noreferrer">CVE-2021-45105</a>. <a href="https://github.com/apache/pulsar/pull/13392" target="_blank" rel="noopener noreferrer">PR-13392</a></p></li><li><p><code>ManagedLedger</code> can be referenced correctly when <code>OpAddEntry</code> is recycled. <a href="https://github.com/apache/pulsar/pull/12103" target="_blank" rel="noopener noreferrer">PR-12103</a></p></li><li><p>NPE does not occur on <code>OpAddEntry</code> while ManagedLedger is closing. <a href="https://github.com/apache/pulsar/pull/12364" target="_blank" rel="noopener noreferrer">PR-12364</a></p></li></ul><p>This blog walks through the most noteworthy changes grouped by the affected functionalities. For the complete list including all enhancements and bug fixes, check out the <a href="https://pulsar.apache.org/en/release-notes/#274" target="_blank" rel="noopener noreferrer">Pulsar 2.7.4 Release Notes</a>.</p><h1>Notable bug fixes and enhancements</h1><h3 class="anchor anchorWithStickyNavbar_LWe7" id="upgrade-log4j-to-2170---cve-2021-45105-pr-13392">Upgrade Log4j to 2.17.0 - <a href="https://pulsar.apache.org/blog/2021/12/11/Log4j-CVE/" target="_blank" rel="noopener noreferrer">CVE-2021-45105</a>. <a href="https://github.com/apache/pulsar/pull/13392" target="_blank" rel="noopener noreferrer">PR-13392</a><a href="#upgrade-log4j-to-2170---cve-2021-45105-pr-13392" class="hash-link" aria-label="Direct link to upgrade-log4j-to-2170---cve-2021-45105-pr-13392" title="Direct link to upgrade-log4j-to-2170---cve-2021-45105-pr-13392"></a></h3><ul><li><p><strong>Issue</strong></p><p>A serious vulnerability was reported regarding Log4j that can allow remote execution for attackers. The vulnerability issue is described and tracked under <a href="https://nvd.nist.gov/vuln/detail/CVE-2021-44228" target="_blank" rel="noopener noreferrer">CVE-2021-44228</a>.</p></li><li><p><strong>Resolution</strong></p><p>Pulsar 2.7.4 upgraded Log4j to 2.17.0.</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="managedledger-can-be-referenced-correctly-when-opaddentry-is-recycled-pr-12103"><code>ManagedLedger</code> can be referenced correctly when <code>OpAddEntry</code> is recycled. <a href="https://github.com/apache/pulsar/pull/12103" target="_blank" rel="noopener noreferrer">PR-12103</a><a href="#managedledger-can-be-referenced-correctly-when-opaddentry-is-recycled-pr-12103" class="hash-link" aria-label="Direct link to managedledger-can-be-referenced-correctly-when-opaddentry-is-recycled-pr-12103" title="Direct link to managedledger-can-be-referenced-correctly-when-opaddentry-is-recycled-pr-12103"></a></h3><ul><li><p><strong>Issue</strong></p><p>Previously, after a write failure, a task was scheduled in the background to force close the ledger and trigger the creation of a new ledger. If the <code>OpAddEntry</code> instance was already recycled, that could lead to either an NPE or undefined behavior.</p></li><li><p><strong>Resolution</strong></p><p>The <code>ManagedLedgerImpl</code> object reference is copied to a final variable so the background task will not be dependent on the lifecycle of the <code>OpAddEntry</code> instance.</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="no-potential-race-condition-in-the-blobstorebackedreadhandler-pr-12123">No potential race condition in the <code>BlobStoreBackedReadHandler</code>. <a href="https://github.com/apache/pulsar/pull/12123" target="_blank" rel="noopener noreferrer">PR-12123</a><a href="#no-potential-race-condition-in-the-blobstorebackedreadhandler-pr-12123" class="hash-link" aria-label="Direct link to no-potential-race-condition-in-the-blobstorebackedreadhandler-pr-12123" title="Direct link to no-potential-race-condition-in-the-blobstorebackedreadhandler-pr-12123"></a></h3><ul><li><p><strong>Issue</strong></p><p>Previously, <code>BlobStoreBackedReadHandler</code> entered an infinite loop when reading an offload ledger. There was a race condition between the operation of reading entries and closing BlobStoreBackedReadHandler.</p></li><li><p><strong>Resolution</strong></p><p>Added a state check before reading entries and made the <code>BlobStoreBackedReadHandler</code> exit loop when the <code>entryID</code> is bigger than the <code>lastEntryID</code>.</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="npe-does-not-occur-on-opaddentry-while-managedledger-is-closing-pr-12364">NPE does not occur on <code>OpAddEntry</code> while ManagedLedger is closing. <a href="https://github.com/apache/pulsar/pull/12364" target="_blank" rel="noopener noreferrer">PR-12364</a><a href="#npe-does-not-occur-on-opaddentry-while-managedledger-is-closing-pr-12364" class="hash-link" aria-label="Direct link to npe-does-not-occur-on-opaddentry-while-managedledger-is-closing-pr-12364" title="Direct link to npe-does-not-occur-on-opaddentry-while-managedledger-is-closing-pr-12364"></a></h3><ul><li><p><strong>Issue</strong> </p><p>Previously, the test <code>ManagedLedgerBkTest#managedLedgerClosed</code> closed ManagedLedger object on some <code>asyncAddEntry</code> operations and failed with NPE.</p></li><li><p><strong>Resolution</strong></p><p>Closed <code>OpAddEntry</code> when <code> ManagedLedger</code> signaled <code>OpAddEntry</code> to fail. In this way, the <code>OpAddEntry</code> object was correctly recycled and the failed callback was correctly triggered.</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="set-a-topic-policy-through-the-topic-name-of-a-partition-correctly-pr-11294">Set a topic policy through the topic name of a partition correctly. <a href="https://github.com/apache/pulsar/pull/11294" target="_blank" rel="noopener noreferrer">PR-11294</a><a href="#set-a-topic-policy-through-the-topic-name-of-a-partition-correctly-pr-11294" class="hash-link" aria-label="Direct link to set-a-topic-policy-through-the-topic-name-of-a-partition-correctly-pr-11294" title="Direct link to set-a-topic-policy-through-the-topic-name-of-a-partition-correctly-pr-11294"></a></h3><ul><li><p><strong>Issue</strong></p><p>Previously, the topic name of a partition could not be used to set a topic policy.</p></li><li><p><strong>Resolution</strong></p><p>Allowed setting a topic policy through a topic name of a partition by converting the topic name of a partition in <code>SystemTopicBasedTopicPoliciesService</code>.</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="dispatch-rate-limiter-takes-effect-for-consumers-pr-8611">Dispatch rate limiter takes effect for consumers. <a href="https://github.com/apache/pulsar/pull/8611" target="_blank" rel="noopener noreferrer">PR-8611</a><a href="#dispatch-rate-limiter-takes-effect-for-consumers-pr-8611" class="hash-link" aria-label="Direct link to dispatch-rate-limiter-takes-effect-for-consumers-pr-8611" title="Direct link to dispatch-rate-limiter-takes-effect-for-consumers-pr-8611"></a></h3><ul><li><p><strong>Issue</strong></p><p>Previously, dispatch rate limiter did not take effect in cases where all consumers started reading in the next second since <code>acquiredPermits</code> was reset to 0 every second.</p></li><li><p><strong>Resolution</strong></p><p>Changed the behaviour of <code>DispatchRateLimiter</code> by minus <code>permits</code> every second instead of reset <code>acquiredPermits</code> to 0. Consumers stopped reading entries temporarily until <code>acquiredPermits</code> returned to a value less than <code>permits</code> .</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="npe-does-not-occur-when-executing-unload-bundles-operations-pr-11310">NPE does not occur when executing unload bundles operations. <a href="https://github.com/apache/pulsar/pull/11310" target="_blank" rel="noopener noreferrer">PR-11310</a><a href="#npe-does-not-occur-when-executing-unload-bundles-operations-pr-11310" class="hash-link" aria-label="Direct link to npe-does-not-occur-when-executing-unload-bundles-operations-pr-11310" title="Direct link to npe-does-not-occur-when-executing-unload-bundles-operations-pr-11310"></a></h3><ul><li><p><strong>Issue</strong></p><p>When performing pressure tests on persistent partitioned topics, NPE occurred when executing unload bundles operations. Concurrently, producers did not write messages.</p></li><li><p><strong>Resolution</strong></p><p>Added more safety checks to fix this issue.</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="fix-inconsistent-behavior-for-namespace-bundles-cache-pr-11346">Fix inconsistent behavior for Namespace bundles cache. <a href="https://github.com/apache/pulsar/pull/11346" target="_blank" rel="noopener noreferrer">PR-11346</a><a href="#fix-inconsistent-behavior-for-namespace-bundles-cache-pr-11346" class="hash-link" aria-label="Direct link to fix-inconsistent-behavior-for-namespace-bundles-cache-pr-11346" title="Direct link to fix-inconsistent-behavior-for-namespace-bundles-cache-pr-11346"></a></h3><ul><li><p><strong>Issue</strong></p><p>Previously, namespace bundle cache was not invalidated after a namespace was deleted.</p></li><li><p><strong>Resolution</strong></p><p>Invalidated namespace policy cache when bundle cache was invalidated.</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="close-the-replicator-and-replication-client-after-a-cluster-is-deleted-pr-11342">Close the replicator and replication client after a cluster is deleted. <a href="https://github.com/apache/pulsar/pull/11342" target="_blank" rel="noopener noreferrer">PR-11342</a><a href="#close-the-replicator-and-replication-client-after-a-cluster-is-deleted-pr-11342" class="hash-link" aria-label="Direct link to close-the-replicator-and-replication-client-after-a-cluster-is-deleted-pr-11342" title="Direct link to close-the-replicator-and-replication-client-after-a-cluster-is-deleted-pr-11342"></a></h3><ul><li><p><strong>Issue</strong></p><p>Previously, the replicator and the replication client were not closed after a cluster was deleted. The producer of the replicator would then try to reconnect to the deleted cluster continuously.</p></li><li><p><strong>Resolution</strong></p><p>Closed the relative replicator and replication client.</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="publish-rate-limiter-takes-effect-as-expected-pr-10384">Publish rate limiter takes effect as expected. <a href="https://github.com/apache/pulsar/pull/10384" target="_blank" rel="noopener noreferrer">PR-10384</a><a href="#publish-rate-limiter-takes-effect-as-expected-pr-10384" class="hash-link" aria-label="Direct link to publish-rate-limiter-takes-effect-as-expected-pr-10384" title="Direct link to publish-rate-limiter-takes-effect-as-expected-pr-10384"></a></h3><ul><li><p><strong>Issue</strong></p><p>Previously, there were various issues if <code>preciseTopicPublishRateLimiterEnable</code> was set to <code>true</code> for rate limiting:</p><ul><li><p>Updating the limits did not set a boundary when changing the limits from a bounded limit to an unbounded limit.</p></li><li><p>Each topic created a scheduler thread for each limiter instance.</p></li><li><p>Topics did not release the scheduler thread when the topic was unloaded or the operation closed.</p></li><li><p>Updating the limits did not close the scheduler thread related to the replaced limiter instance</p></li></ul></li><li><p><strong>Resolution</strong></p><ul><li><p>Cleaned up the previous limiter instances before creating new limiter instances.</p></li><li><p>Used <code>brokerService.pulsar().getExecutor()</code> as the scheduler for the rate limiter instances.</p></li><li><p>Added resource cleanup hooks for topic closing (unload).</p></li></ul></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="clean-up-newly-created--ledgers-if-fails-to-update-znode-list-pr-12015">Clean up newly created ledgers if fails to update ZNode list. <a href="https://github.com/apache/pulsar/pull/12015" target="_blank" rel="noopener noreferrer">PR-12015</a><a href="#clean-up-newly-created--ledgers-if-fails-to-update-znode-list-pr-12015" class="hash-link" aria-label="Direct link to clean-up-newly-created--ledgers-if-fails-to-update-znode-list-pr-12015" title="Direct link to clean-up-newly-created--ledgers-if-fails-to-update-znode-list-pr-12015"></a></h3><ul><li><p><strong>Issue</strong></p><p>When updating a ZNode list, ZooKeeper threw an exception and did not clean up the created ledger. Newly created ledgers were not indexed to a topic <code>managedLedger</code> list and could not be cleared up as topic retention. Also, ZNode numbers increased in ZooKeeper if the ZNode version mismatch exception was thrown out.</p></li><li><p><strong>Resolution</strong></p><p>Deleted the created ledger from broker cache and BookKeeper regardless of exception type when the ZNode list failed to update.</p></li></ul><h1>What’s Next?</h1><p>If you are interested in learning more about Pulsar 2.7.4, you can <a href="https://pulsar.apache.org/en/versions/" target="_blank" rel="noopener noreferrer">download</a> and try it out now! </p><p>Pulsar Summit Asia 2021 will take place on January 15-16, 2022. <a href="https://pulsar-summit.org/" target="_blank" rel="noopener noreferrer">Register now</a> and help us make it an even bigger success by spreading the word on social media!</p><p>For more information about the Apache Pulsar project and current progress, visit |
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