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@@ -15,48 +15,56 @@
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Apache Hadoop ${project.version}
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================================
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-Apache Hadoop ${project.version} is a minor release in the 2.x.y release
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-line, building upon the previous stable release 2.4.1.
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+Apache Hadoop ${project.version} is a point release in the 2.x.y release
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+line, building upon the previous stable release 2.9.1.
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Here is a short overview of the major features and improvements.
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* Common
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- * Authentication improvements when using an HTTP proxy server. This is
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- useful when accessing WebHDFS via a proxy server.
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-
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- * A new Hadoop metrics sink that allows writing directly to Graphite.
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+ * Aliyun OSS Support. See the
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+ [user documentation](./hadoop-aliyun/tools/hadoop-aliyun/index.html)
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+ for more details.
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- * [Specification work](./hadoop-project-dist/hadoop-common/filesystem/index.html)
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- related to the Hadoop Compatible Filesystem (HCFS) effort.
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+ * HADOOP Resource Estimator. See the
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+ [user documentation](./hadoop-resourceestimator/ResourceEstimator.html)
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+ for more details.
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* HDFS
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- * Support for POSIX-style filesystem extended attributes. See the
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- [user documentation](./hadoop-project-dist/hadoop-hdfs/ExtendedAttributes.html)
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+ * HDFS Router based federation. See the
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+ [user documentation](./hadoop-project-dist/hadoop-hdfs-rbf/HDFSRouterFederation.html)
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for more details.
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- * Using the OfflineImageViewer, clients can now browse an fsimage via
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- the WebHDFS API.
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+* YARN
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- * The NFS gateway received a number of supportability improvements and
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- bug fixes. The Hadoop portmapper is no longer required to run the gateway,
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- and the gateway is now able to reject connections from unprivileged ports.
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+ * YARN Timeline Service v.2. See the
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+ [user documentation](./hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html)
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+ for more details.
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- * The SecondaryNameNode, JournalNode, and DataNode web UIs have been
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- modernized with HTML5 and Javascript.
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+ * YARN Federation. See the
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+ [user documentation](./hadoop-yarn/hadoop-yarn-site/Federation.html)
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+ for more details.
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-* YARN
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+ * Opportunistic Containers. See the
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+ [user documentation](./hadoop-yarn/hadoop-yarn-site/OpportunisticContainers.html)
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+ for more details.
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+
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+ * YARN Web UI v.2. See the
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+ [user documentation](./hadoop-yarn/hadoop-yarn-site/YarnUI2.html)
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+ for more details.
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+
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+ * Capacity Scheduler
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- * YARN's REST APIs now support write/modify operations. Users can submit and
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- kill applications through REST APIs.
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+ * Changing queue configuration via API. See the
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+ [user documentation](./hadoop-yarn/hadoop-yarn-site/CapacityScheduler.html#Changing_queue_configuration_via_API)
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+ for more details.
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- * The timeline store in YARN, used for storing generic and
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- application-specific information for applications, supports authentication
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- through Kerberos.
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+ * Update Resources and Execution Type of an
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+ allocated/running container. See the
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+ [user documentation](./hadoop-yarn/hadoop-yarn-site/CapacityScheduler.html#Updating_a_Container_Experimental_-_API_may_change_in_the_future)
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+ for more details.
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- * The Fair Scheduler supports dynamic hierarchical user queues, user queues
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- are created dynamically at runtime under any specified parent-queue.
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Getting Started
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===============
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@@ -66,4 +74,4 @@ Hadoop. Begin with the
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[Single Node Setup](./hadoop-project-dist/hadoop-common/SingleCluster.html) which
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shows you how to set up a single-node Hadoop installation. Then move on to the
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[Cluster Setup](./hadoop-project-dist/hadoop-common/ClusterSetup.html) to learn how
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-to set up a multi-node Hadoop installation.
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+to set up a multi-node Hadoop installation.
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