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<a href="../../../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduce_Compatibility_Hadoop1_Hadoop2.html">Compatibility with 1.x</a>
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<a href="../../../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/EncryptedShuffle.html">Encrypted Shuffle</a>
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<h5>MapReduce REST APIs</h5>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/YARN.html">Architecture</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/ResourceManagerHA.html">ResourceManager HA</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/ResourceModel.html">Resource Model</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/NodeLabel.html">Node Labels</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/NodeAttributes.html">Node Attributes</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/WebApplicationProxy.html">Web Application Proxy</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/TimelineServer.html">Timeline Server</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html">Timeline Service V.2</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/DockerContainers.html">Running Applications in Docker Containers</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/RuncContainers.html">Running Applications in runC Containers</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/NodeManagerCgroups.html">Using CGroups</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/SecureContainer.html">Secure Containers</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/ReservationSystem.html">Reservation System</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/GracefulDecommission.html">Graceful Decommission</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/OpportunisticContainers.html">Opportunistic Containers</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/Federation.html">YARN Federation</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/SharedCache.html">Shared Cache</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/UsingGpus.html">Using GPU</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/UsingFPGA.html">Using FPGA</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/PlacementConstraints.html">Placement Constraints</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/YarnUI2.html">YARN UI2</a>
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<h5>YARN REST APIs</h5>
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<ul>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/WebServicesIntro.html">Introduction</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/ResourceManagerRest.html">Resource Manager</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/NodeManagerRest.html">Node Manager</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/TimelineServer.html#Timeline_Server_REST_API_v1">Timeline Server</a>
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<li class="none">
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html#Timeline_Service_v.2_REST_API">Timeline Service V.2</a>
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</li>
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</ul>
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<h5>YARN Service</h5>
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<ul>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/yarn-service/Overview.html">Overview</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/yarn-service/QuickStart.html">QuickStart</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/yarn-service/Concepts.html">Concepts</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/yarn-service/YarnServiceAPI.html">Yarn Service API</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/yarn-service/ServiceDiscovery.html">Service Discovery</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/yarn-service/SystemServices.html">System Services</a>
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</ul>
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<h5>Hadoop Compatible File Systems</h5>
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<ul>
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<a href="../../../../hadoop-aliyun/tools/hadoop-aliyun/index.html">Aliyun OSS</a>
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<a href="../../../../hadoop-aws/tools/hadoop-aws/index.html">Amazon S3</a>
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<a href="../../../../hadoop-azure/index.html">Azure Blob Storage</a>
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<a href="../../../../hadoop-azure-datalake/index.html">Azure Data Lake Storage</a>
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<a href="../../../../hadoop-cos/cloud-storage/index.html">Tencent COS</a>
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<a href="../../../../hadoop-huaweicloud/cloud-storage/index.html">Huaweicloud OBS</a>
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</ul>
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<h1>Apache Hadoop 3.2.3 Release Notes</h1>
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<p>These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.</p><hr />
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<ul>
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<li><a class="externalLink" href="https://issues.apache.org/jira/browse/YARN-10036">YARN-10036</a> | <i>Major</i> | <b>Install yarnpkg and upgrade nodejs in Dockerfile</b></li>
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<p>In the Dockerfile, nodejs is upgraded to 8.17.0 and yarn 1.12.1 is installed.</p><hr />
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<ul>
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<li><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-16054">HADOOP-16054</a> | <i>Major</i> | <b>Update Dockerfile to use Bionic</b></li>
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</ul>
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<p>The build image has been upgraded to Bionic.</p><hr />
|
|
<ul>
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<li><a class="externalLink" href="https://issues.apache.org/jira/browse/HDFS-15719">HDFS-15719</a> | <i>Critical</i> | <b>[Hadoop 3] Both NameNodes can crash simultaneously due to the short JN socket timeout</b></li>
|
|
</ul>
|
|
<p>The default value of the configuration hadoop.http.idle_timeout.ms (how long does Jetty disconnect an idle connection) is changed from 10000 to 60000. This property is inlined during compile time, so an application that references this property must be recompiled in order for it to take effect.</p><hr />
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<ul>
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<li><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-16748">HADOOP-16748</a> | <i>Major</i> | <b>Migrate to Python 3 and upgrade Yetus to 0.13.0</b></li>
|
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</ul><!-- markdown -->
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<ul>
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|
<li>Upgraded Yetus to 0.13.0.</li>
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<li>Removed determine-flaky-tests-hadoop.py.</li>
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<li>Temporarily disabled shelldocs check in the Jenkins jobs due to YETUS-1099.</li>
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</ul><hr />
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<ul>
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<li><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-16870">HADOOP-16870</a> | <i>Major</i> | <b>Use spotbugs-maven-plugin instead of findbugs-maven-plugin</b></li>
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<p>Removed findbugs from the hadoop build images and added spotbugs instead. Upgraded SpotBugs to 4.2.2 and spotbugs-maven-plugin to 4.2.0.</p><hr />
|
|
<ul>
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<li><a class="externalLink" href="https://issues.apache.org/jira/browse/HDFS-15942">HDFS-15942</a> | <i>Major</i> | <b>Increase Quota initialization threads</b></li>
|
|
</ul>
|
|
<p>The default quota initialization thread count during the NameNode startup process (dfs.namenode.quota.init-threads) is increased from 4 to 12.</p>
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