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</script></nav></div><div class="container mainContainer postContainer blogContainer"><div class="wrapper"><div class="lonePost"><div class="post"><header class="postHeader"><h1 class="postHeaderTitle"><a href="/blog/2021/12/14/Apache-Pulsar-2-7-4">What’s New in Apache Pulsar 2.7.4</a></h1><p class="post-meta">December 14, 2021</p><div class="authorBlock"><p class="post-authorName"><a target="_blank" rel="noreferrer noopener">Technoboy-, Anonymitaet</a></p></div></header><div><span><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/">CVE-2021-45105</a>. <a href="https://github.com/apache/pulsar/pull/13392">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">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">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">Pulsar 2.7.4 Release Notes</a>.</p>
<h1><a class="anchor" aria-hidden="true" id="notable-bug-fixes-and-enhancements"></a><a href="#notable-bug-fixes-and-enhancements" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Notable bug fixes and enhancements</h1>
<h3><a class="anchor" aria-hidden="true" id="upgrade-log4j-to-2170---cve-2021-45105httpspulsarapacheorgblog20211211log4j-cve-pr-13392httpsgithubcomapachepulsarpull13392"></a><a href="#upgrade-log4j-to-2170---cve-2021-45105httpspulsarapacheorgblog20211211log4j-cve-pr-13392httpsgithubcomapachepulsarpull13392" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Upgrade Log4j to 2.17.0 - <a href="https://pulsar.apache.org/blog/2021/12/11/Log4j-CVE/">CVE-2021-45105</a>. <a href="https://github.com/apache/pulsar/pull/13392">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">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><a class="anchor" aria-hidden="true" id="managedledger-can-be-referenced-correctly-when-opaddentry-is-recycled-pr-12103httpsgithubcomapachepulsarpull12103"></a><a href="#managedledger-can-be-referenced-correctly-when-opaddentry-is-recycled-pr-12103httpsgithubcomapachepulsarpull12103" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>ManagedLedger</code> can be referenced correctly when <code>OpAddEntry</code> is recycled. <a href="https://github.com/apache/pulsar/pull/12103">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><a class="anchor" aria-hidden="true" id="no-potential-race-condition-in-the-blobstorebackedreadhandler-pr-12123httpsgithubcomapachepulsarpull12123"></a><a href="#no-potential-race-condition-in-the-blobstorebackedreadhandler-pr-12123httpsgithubcomapachepulsarpull12123" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>No potential race condition in the <code>BlobStoreBackedReadHandler</code>. <a href="https://github.com/apache/pulsar/pull/12123">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><a class="anchor" aria-hidden="true" id="npe-does-not-occur-on-opaddentry-while-managedledger-is-closing-pr-12364httpsgithubcomapachepulsarpull12364"></a><a href="#npe-does-not-occur-on-opaddentry-while-managedledger-is-closing-pr-12364httpsgithubcomapachepulsarpull12364" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>NPE does not occur on <code>OpAddEntry</code> while ManagedLedger is closing. <a href="https://github.com/apache/pulsar/pull/12364">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><a class="anchor" aria-hidden="true" id="set-a-topic-policy-through-the-topic-name-of-a-partition-correctly-pr-11294httpsgithubcomapachepulsarpull11294"></a><a href="#set-a-topic-policy-through-the-topic-name-of-a-partition-correctly-pr-11294httpsgithubcomapachepulsarpull11294" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Set a topic policy through the topic name of a partition correctly. <a href="https://github.com/apache/pulsar/pull/11294">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><a class="anchor" aria-hidden="true" id="dispatch-rate-limiter-takes-effect-for-consumers-pr-8611httpsgithubcomapachepulsarpull8611"></a><a href="#dispatch-rate-limiter-takes-effect-for-consumers-pr-8611httpsgithubcomapachepulsarpull8611" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dispatch rate limiter takes effect for consumers. <a href="https://github.com/apache/pulsar/pull/8611">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><a class="anchor" aria-hidden="true" id="npe-does-not-occur-when-executing-unload-bundles-operations-pr-11310httpsgithubcomapachepulsarpull11310"></a><a href="#npe-does-not-occur-when-executing-unload-bundles-operations-pr-11310httpsgithubcomapachepulsarpull11310" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>NPE does not occur when executing unload bundles operations. <a href="https://github.com/apache/pulsar/pull/11310">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><a class="anchor" aria-hidden="true" id="fix-inconsistent-behavior-for-namespace-bundles-cache-pr-11346httpsgithubcomapachepulsarpull11346"></a><a href="#fix-inconsistent-behavior-for-namespace-bundles-cache-pr-11346httpsgithubcomapachepulsarpull11346" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Fix inconsistent behavior for Namespace bundles cache. <a href="https://github.com/apache/pulsar/pull/11346">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><a class="anchor" aria-hidden="true" id="close-the-replicator-and-replication-client-after-a-cluster-is-deleted-pr-11342httpsgithubcomapachepulsarpull11342"></a><a href="#close-the-replicator-and-replication-client-after-a-cluster-is-deleted-pr-11342httpsgithubcomapachepulsarpull11342" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Close the replicator and replication client after a cluster is deleted. <a href="https://github.com/apache/pulsar/pull/11342">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><a class="anchor" aria-hidden="true" id="publish-rate-limiter-takes-effect-as-expected-pr-10384httpsgithubcomapachepulsarpull10384"></a><a href="#publish-rate-limiter-takes-effect-as-expected-pr-10384httpsgithubcomapachepulsarpull10384" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Publish rate limiter takes effect as expected. <a href="https://github.com/apache/pulsar/pull/10384">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><a class="anchor" aria-hidden="true" id="clean-up-newly-created--ledgers-if-fails-to-update-znode-list-pr-12015httpsgithubcomapachepulsarpull12015"></a><a href="#clean-up-newly-created--ledgers-if-fails-to-update-znode-list-pr-12015httpsgithubcomapachepulsarpull12015" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Clean up newly created ledgers if fails to update ZNode list. <a href="https://github.com/apache/pulsar/pull/12015">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><a class="anchor" aria-hidden="true" id="whats-next"></a><a href="#whats-next" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>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/">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/">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
the <a href="https://pulsar.apache.org">Pulsar website</a>, follow the project on Twitter
<a href="https://twitter.com/apache_pulsar">@apache_pulsar</a>, and join <a href="https://apache-pulsar.herokuapp.com/">Pulsar Slack</a>!</p>
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