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<a href="../../../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduceTutorial.html">Tutorial</a>
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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/YarnCommands.html">Commands Reference</a>
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<a href="../../../../hadoop-yarn/hadoop-yarn-site/ResourceManagerRestart.html">ResourceManager Restart</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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<li class="none">
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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 2.8.3 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/HADOOP-13588">HADOOP-13588</a> | <i>Major</i> | <b>ConfServlet should respect Accept request header</b></li>
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</ul>
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<p>Conf HTTP service should set response’s content type according to the Accept header in the request.</p><hr />
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<ul>
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<li><a class="externalLink" href="https://issues.apache.org/jira/browse/HADOOP-14260">HADOOP-14260</a> | <i>Major</i> | <b>Configuration.dumpConfiguration should redact sensitive information</b></li>
|
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</ul><!-- markdown -->
|
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Configuration.dumpConfiguration no longer prints out the clear text values for the sensitive keys listed in `hadoop.security.sensitive-config-keys`. Callers can override the default list of sensitive keys either to redact more keys or print the clear text values for a few extra keys for debugging purpose.
|
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<hr />
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<ul>
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<li><a class="externalLink" href="https://issues.apache.org/jira/browse/HDFS-11799">HDFS-11799</a> | <i>Major</i> | <b>Introduce a config to allow setting up write pipeline with fewer nodes than replication factor</b></li>
|
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</ul>
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<p>Added new configuration “dfs.client.block.write.replace-datanode-on-failure.min-replication”.</p>
|
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|
<div class="source">
|
|
<div class="source">
|
|
<pre>The minimum number of replications that are needed to not to fail
|
|
the write pipeline if new datanodes can not be found to replace
|
|
failed datanodes (could be due to network failure) in the write pipeline.
|
|
If the number of the remaining datanodes in the write pipeline is greater
|
|
than or equal to this property value, continue writing to the remaining nodes.
|
|
Otherwise throw exception.
|
|
|
|
If this is set to 0, an exception will be thrown, when a replacement
|
|
can not be found.
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</pre></div></div>
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