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itemprop="datePublished">August 11, 2021</time> · <!-- -->6 min read</div></div></header><div id="post-content" class="markdown" itemprop="articleBody"><p>The Apache Pulsar community releases version 2.7.3! 34 contributors provided improvements and bug fixes that delivered 79 commits.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="highlights">Highlights<a href="#highlights" class="hash-link" aria-label="Direct link to Highlights" title="Direct link to Highlights"></a></h2><ul><li><p>Cursor reads adhere to the dispatch byte rate limiter setting and no longer cause unexpected results. <a href="https://github.com/apache/pulsar/pull/11249" target="_blank" rel="noopener noreferrer">PR-11249</a></p></li><li><p>The ledger rollover scheduled task runs as expected. <a href="https://github.com/apache/pulsar/pull/11226" target="_blank" rel="noopener noreferrer">PR-11226</a></p></li></ul><p>This blog walks through the most noteworthy changes. For the complete list including all enhancements and bug fixes, check out the <a href="https://pulsar.apache.org/release-notes/#273-mdash-2021-07-27-a-id273a" target="_blank" rel="noopener noreferrer">Pulsar 2.7.3 Release Notes</a>.</p><h1>Notable bug fixes and enhancements</h1><h2 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></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="cursor-reads-adhere-to-the-dispatch-byte-rate-limiter-setting-pr-9826">Cursor reads adhere to the dispatch byte rate limiter setting. <a href="https://github.com/apache/pulsar/pull/9826" target="_blank" rel="noopener noreferrer">PR-9826</a><a href="#cursor-reads-adhere-to-the-dispatch-byte-rate-limiter-setting-pr-9826" class="hash-link" aria-label="Direct link to cursor-reads-adhere-to-the-dispatch-byte-rate-limiter-setting-pr-9826" title="Direct link to cursor-reads-adhere-to-the-dispatch-byte-rate-limiter-setting-pr-9826"></a></h3><ul><li><p><strong>Issue</strong>: When using byte rates, the dispatch rates were not respected (regardless |
| of being a namespace or topic policy). </p></li><li><p><strong>Resolution</strong>: Fixed behavior of dispatch byte rate limiter setting. Cursor reads adhere to the setting and no longer cause unexpected results. </p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="the-ledger-rollover-scheduled-task-runs-as-expected-pr-11226">The ledger rollover scheduled task runs as expected. <a href="https://github.com/apache/pulsar/pull/11226" target="_blank" rel="noopener noreferrer">PR-11226</a><a href="#the-ledger-rollover-scheduled-task-runs-as-expected-pr-11226" class="hash-link" aria-label="Direct link to the-ledger-rollover-scheduled-task-runs-as-expected-pr-11226" title="Direct link to the-ledger-rollover-scheduled-task-runs-as-expected-pr-11226"></a></h3><ul><li><p><strong>Issue</strong>: Previously, the ledger rollover scheduled task was executed before reaching the ledger maximum rollover time, which caused the ledger not to roll over in time. </p></li><li><p><strong>Resolution</strong>: Fixed the timing of the ledger rollover schedule, so the task runs only after the ledger is created successfully. </p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="the-topic-level-retention-policy-works-correctly-when-restarting-a-broker-pr-11136">The topic-level retention policy works correctly when restarting a broker. <a href="https://github.com/apache/pulsar/pull/11136" target="_blank" rel="noopener noreferrer">PR-11136</a><a href="#the-topic-level-retention-policy-works-correctly-when-restarting-a-broker-pr-11136" class="hash-link" aria-label="Direct link to the-topic-level-retention-policy-works-correctly-when-restarting-a-broker-pr-11136" title="Direct link to the-topic-level-retention-policy-works-correctly-when-restarting-a-broker-pr-11136"></a></h3><ul><li><p><strong>Issue</strong>: Previously, when setting a topic-level retention policy for a topic and then restarting the broker, the topic-level retention policy did not work.</p></li><li><p><strong>Resolution</strong>: Fixed behavior of the policy so it replays all policy messages after initiating <code>policyCacheInitMap</code> and added a retention policy check test when restarting the broker.</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="the-lastmessageid-api-call-no-longer-causes-a-memory-leak-pr-10977">The lastMessageId API call no longer causes a memory leak. <a href="https://github.com/apache/pulsar/pull/10977" target="_blank" rel="noopener noreferrer">PR-10977</a><a href="#the-lastmessageid-api-call-no-longer-causes-a-memory-leak-pr-10977" class="hash-link" aria-label="Direct link to the-lastmessageid-api-call-no-longer-causes-a-memory-leak-pr-10977" title="Direct link to the-lastmessageid-api-call-no-longer-causes-a-memory-leak-pr-10977"></a></h3><ul><li><p><strong>Issue</strong>: Previously, there was a memory leak when calling the <code>lastMessageId</code> API, which caused the broker process to be stopped by Kubernetes. </p></li><li><p><strong>Resolution</strong>: Added the missing entry.release() call to PersistentTopic.getLastMessageId to ensure the broker does not run out of memory. </p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="zookeeper-reads-are-cached-by-brokers-pr-10594">ZooKeeper reads are cached by brokers. <a href="https://github.com/apache/pulsar/pull/10594" target="_blank" rel="noopener noreferrer">PR-10594</a><a href="#zookeeper-reads-are-cached-by-brokers-pr-10594" class="hash-link" aria-label="Direct link to zookeeper-reads-are-cached-by-brokers-pr-10594" title="Direct link to zookeeper-reads-are-cached-by-brokers-pr-10594"></a></h3><ul><li><p><strong>Issue</strong>: When performing the admin operation to get the namespace of a tenant, ZooKeeper reads were issued on the ZooKeeper client and not getting cached by the brokers.</p></li><li><p><strong>Resolution</strong>: Fixed ZooKeeper caching when fetching a list of namespaces for a tenant.</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="monitoring-threads-that-call-leaderserviceisleader-are-no-longer-blocked-pr-10512">Monitoring threads that call <code>LeaderService.isLeader()</code> are no longer blocked. <a href="https://github.com/apache/pulsar/pull/10512" target="_blank" rel="noopener noreferrer">PR-10512</a><a href="#monitoring-threads-that-call-leaderserviceisleader-are-no-longer-blocked-pr-10512" class="hash-link" aria-label="Direct link to monitoring-threads-that-call-leaderserviceisleader-are-no-longer-blocked-pr-10512" title="Direct link to monitoring-threads-that-call-leaderserviceisleader-are-no-longer-blocked-pr-10512"></a></h3><ul><li><strong>Issue</strong>: When <code>LeaderService</code> changed leadership status, it was locked with a <code>synchronized</code> block, which also blocked other threads calling <code>LeaderService.isLeader()</code>. </li><li><strong>Resolution</strong>: Fixed the deadlock condition on the monitoring thread so it is not blocked by <code>LeaderService.isLeader() by modifying </code>ClusterServiceCoordinator<code>and</code>WorkerStatsManager<code>to check if it is a leader from</code>MembershipManager`. </li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="hasmessageavailable-can-read-messages-successfully-pr-10414"><code>hasMessageAvailable</code> can read messages successfully. <a href="https://github.com/apache/pulsar/pull/10414" target="_blank" rel="noopener noreferrer">PR-10414</a><a href="#hasmessageavailable-can-read-messages-successfully-pr-10414" class="hash-link" aria-label="Direct link to hasmessageavailable-can-read-messages-successfully-pr-10414" title="Direct link to hasmessageavailable-can-read-messages-successfully-pr-10414"></a></h3><ul><li><p><strong>Issue</strong>: When <code>hasMessageAvailableAsync</code> returned <code>true</code>, it could not read messages because messages were filtered by <code>acknowledgmentsGroupingTracker</code>. </p></li><li><p><strong>Resolution</strong>: Fixed the race conditions by modifying <code>acknowledgmentsGroupingTracker</code> to filter duplicate messages, and then cleanup the messages when the connection is open.</p></li></ul><h2 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></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="proxy-supports-creating-partitioned-topics-automatically-pr-8048">Proxy supports creating partitioned topics automatically. <a href="https://github.com/apache/pulsar/pull/8048" target="_blank" rel="noopener noreferrer">PR-8048</a><a href="#proxy-supports-creating-partitioned-topics-automatically-pr-8048" class="hash-link" aria-label="Direct link to proxy-supports-creating-partitioned-topics-automatically-pr-8048" title="Direct link to proxy-supports-creating-partitioned-topics-automatically-pr-8048"></a></h3><ul><li><p><strong>Issue</strong>: Proxies were not creating partitions because they were using the current ZooKeeper metadata.</p></li><li><p><strong>Resolution</strong>: Changed the proxy to handle <code>PartitionMetadataRequest</code> by selecting and fetching from an available broker instead of using current ZooKeeper metadata.</p></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="pulsar-admin">Pulsar admin<a href="#pulsar-admin" class="hash-link" aria-label="Direct link to Pulsar admin" title="Direct link to Pulsar admin"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="flag-added-to-indicate-whether-or-not-to-create-a-metadata-path-on-replicated-clusters-pr-11140">Flag added to indicate whether or not to create a metadata path on replicated clusters. <a href="https://github.com/apache/pulsar/pull/11140" target="_blank" rel="noopener noreferrer">PR-11140</a><a href="#flag-added-to-indicate-whether-or-not-to-create-a-metadata-path-on-replicated-clusters-pr-11140" class="hash-link" aria-label="Direct link to flag-added-to-indicate-whether-or-not-to-create-a-metadata-path-on-replicated-clusters-pr-11140" title="Direct link to flag-added-to-indicate-whether-or-not-to-create-a-metadata-path-on-replicated-clusters-pr-11140"></a></h3><ul><li><p><strong>Issue</strong>: When creating a partitioned topic in a replicated namespace, it did not |
| create a metadata path <code>/managed-ledgers</code> on replicated clusters.</p></li><li><p><strong>Resolution</strong>: Added a flag (createLocalTopicOnly) to indicate whether or not to create a metadata path for a partitioned topic in replicated clusters.</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="a-topic-policy-can-no-longer-be-set-for-a-non-existent-topic-pr-11131">A topic policy can no longer be set for a non-existent topic. <a href="https://github.com/apache/pulsar/pull/11131" target="_blank" rel="noopener noreferrer">PR-11131</a><a href="#a-topic-policy-can-no-longer-be-set-for-a-non-existent-topic-pr-11131" class="hash-link" aria-label="Direct link to a-topic-policy-can-no-longer-be-set-for-a-non-existent-topic-pr-11131" title="Direct link to a-topic-policy-can-no-longer-be-set-for-a-non-existent-topic-pr-11131"></a></h3><ul><li><p><strong>Issue</strong>: Due to a redirect loop in a topic policy, you can set a policy for a non-existing topic or a partition of a partitioned topic. </p></li><li><p><strong>Resolution</strong>: The fix added an authoritative flag for a topic policy to avoid a redirect loop. You can not set a topic policy for a non-existent topic or a partition of a partitioned topic. If you set a topic policy for a partition of a 0-partition topic, it redirects to the broker. </p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="discovery-service-no-longer-hard-codes-the-topic-domain-as-persistent-pr-10806">Discovery service no longer hard codes the topic domain as persistent. <a href="https://github.com/apache/pulsar/pull/10806" target="_blank" rel="noopener noreferrer">PR-10806</a><a href="#discovery-service-no-longer-hard-codes-the-topic-domain-as-persistent-pr-10806" class="hash-link" aria-label="Direct link to discovery-service-no-longer-hard-codes-the-topic-domain-as-persistent-pr-10806" title="Direct link to discovery-service-no-longer-hard-codes-the-topic-domain-as-persistent-pr-10806"></a></h3><ul><li><p><strong>Issue</strong>: When using the lookup discovery service for a partitioned non-persistent topic, it returned zero rather than the number of partitions. The Pulsar client tried to connect to the topic as if it were a normal topic.</p></li><li><p><strong>Resolution</strong>: Implemented <code>topicName.getDomain().value()</code> rather than hard coding <code>persistent.</code> Now you can use the discovery service for a partitioned, non-persistent topic successfully.</p></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="other-connectors-can-now-use-the-kinesis-backoff-class-pr-10744">Other connectors can now use the Kinesis <code>Backoff</code> class. <a href="https://github.com/apache/pulsar/pull/10744" target="_blank" rel="noopener noreferrer">PR-10744</a><a href="#other-connectors-can-now-use-the-kinesis-backoff-class-pr-10744" class="hash-link" aria-label="Direct link to other-connectors-can-now-use-the-kinesis-backoff-class-pr-10744" title="Direct link to other-connectors-can-now-use-the-kinesis-backoff-class-pr-10744"></a></h3><ul><li><p><strong>Issue</strong>: The Kinesis sink connector <code>Backoff</code> class in the Pulsar client implementation project in combination with the dependency <code>org.apache.pulsar:pulsar-client-original</code> increased the connector size. </p></li><li><p><strong>Resolution</strong>: Added a new class <code>Backoff</code> in the function io-core project so that the Kinesis sink connector and other connectors can use the class.</p></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="client">Client<a href="#client" class="hash-link" aria-label="Direct link to Client" title="Direct link to Client"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="a-flow-request-with-zero-permits-can-not-be-sent-pr-10506">A <code>FLOW</code> request with zero permits can not be sent. <a href="https://github.com/apache/pulsar/pull/10506" target="_blank" rel="noopener noreferrer">PR-10506</a><a href="#a-flow-request-with-zero-permits-can-not-be-sent-pr-10506" class="hash-link" aria-label="Direct link to a-flow-request-with-zero-permits-can-not-be-sent-pr-10506" title="Direct link to a-flow-request-with-zero-permits-can-not-be-sent-pr-10506"></a></h3><ul><li><strong>Issue</strong>: When a broker received a <code>FLOW</code> request with zero permits, an exception was thrown and then the connection was closed. This triggered frequent reconnections and caused duplicate or out-of-order messages. </li><li><strong>Resolution</strong>: Added a validation that verifies the permits of a <code>FLOW</code> request before sending it. If the permit is zero, the <code>FLOW</code> request can not be sent.</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="function-and-connector">Function and connector<a href="#function-and-connector" class="hash-link" aria-label="Direct link to Function and connector" title="Direct link to Function and connector"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="the-kinesis-sink-connector-acknowledges-successful-messages-pr-10769">The Kinesis sink connector acknowledges successful messages. <a href="https://github.com/apache/pulsar/pull/10769" target="_blank" rel="noopener noreferrer">PR-10769</a><a href="#the-kinesis-sink-connector-acknowledges-successful-messages-pr-10769" class="hash-link" aria-label="Direct link to the-kinesis-sink-connector-acknowledges-successful-messages-pr-10769" title="Direct link to the-kinesis-sink-connector-acknowledges-successful-messages-pr-10769"></a></h3><ul><li><strong>Issue</strong>: The Kinesis sink connector did not acknowledge messages after they were sent successfully. </li><li><strong>Resolution</strong>: Added acknowledgement for the Kinesis sink connector once a message is sent successfully. </li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="docker">Docker<a href="#docker" class="hash-link" aria-label="Direct link to Docker" title="Direct link to Docker"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="function-name-length-cannot-exceed-52-characters-when-using-kubernetes-runtime-pr-10531">Function name length cannot exceed 52 characters when using Kubernetes runtime. <a href="https://github.com/apache/pulsar/pull/10531" target="_blank" rel="noopener noreferrer">PR-10531</a><a href="#function-name-length-cannot-exceed-52-characters-when-using-kubernetes-runtime-pr-10531" class="hash-link" aria-label="Direct link to function-name-length-cannot-exceed-52-characters-when-using-kubernetes-runtime-pr-10531" title="Direct link to function-name-length-cannot-exceed-52-characters-when-using-kubernetes-runtime-pr-10531"></a></h3><ul><li><strong>Issue</strong>: When using Kubernetes runtime, if a function was submitted with a valid length (less than 55 characters), a StatefulSet was created but it was unable to spawn pods. </li><li><strong>Resolution</strong>: Changed the maximum length of a function name from 55 to 53 characters for Kubernetes runtime. With this fix, the length of a function name can not exceed 52 characters. </li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="dependency">Dependency<a href="#dependency" class="hash-link" aria-label="Direct link to Dependency" title="Direct link to Dependency"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="pulsar-admin-connection-to-proxy-is-stable-when-tls-is-enabled-pr-10907"><code>pulsar-admin</code> connection to proxy is stable when TLS is enabled. <a href="https://github.com/apache/pulsar/pull/10907" target="_blank" rel="noopener noreferrer">PR-10907</a><a href="#pulsar-admin-connection-to-proxy-is-stable-when-tls-is-enabled-pr-10907" class="hash-link" aria-label="Direct link to pulsar-admin-connection-to-proxy-is-stable-when-tls-is-enabled-pr-10907" title="Direct link to pulsar-admin-connection-to-proxy-is-stable-when-tls-is-enabled-pr-10907"></a></h3><ul><li><strong>Issue</strong>: <code>pulsar-admin</code> was unstable over the TLS connection because of the Jetty bug in SSL buffering introduced in Jetty 9.4.39. It caused large function jar uploads to fail frequently.</li><li><strong>Resolution</strong>: Upgraded Jetty to 9.4.42.v20210604, so that <code>pulsar-admin</code> connection to proxy is stable when TLS is enabled.</li></ul><h1>What is Next?</h1><p>If you are interested in learning more about Pulsar 2.7.3, you can <a href="https://pulsar.apache.org/en/versions/" target="_blank" rel="noopener noreferrer">download 2.7.3</a> and try it out now! </p><p>The first-ever Pulsar Virtual Summit Europe 2021 will take place in October. <a href="https://hopin.com/events/pulsar-summit-europe-2021" target="_blank" rel="noopener noreferrer">Register now</a> and help us make it an even bigger success by spreading the word on social!</p><p>For more information about the Apache Pulsar project and the progress, visit |
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