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https://issues.apache.org/jira/browse/AMBARI-18694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15616773#comment-15616773
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Hudson commented on AMBARI-18694:
---------------------------------
FAILURE: Integrated in Jenkins build Ambari-trunk-Commit #5889 (See
[https://builds.apache.org/job/Ambari-trunk-Commit/5889/])
AMBARI-18694. DataNode JVM heap settings should include (jaimin:
[http://git-wip-us.apache.org/repos/asf?p=ambari.git&a=commit&h=f50ff49d901b6dba80cb58403dc7b5cc0929652b])
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ambari-server/src/test/resources/stacks_with_common_services/HDP/0.2/services/HDFS/configuration/hadoop-env.xml
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ambari-server/src/main/resources/stacks/HDPWIN/2.2/services/HDFS/configuration/hadoop-env.xml
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ambari-server/src/test/resources/stacks_with_extensions/HDP/0.2/services/HDFS/configuration/hadoop-env.xml
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ambari-server/src/main/resources/stacks/HDP/2.0.6.GlusterFS/services/GLUSTERFS/configuration/hadoop-env.xml
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ambari-server/src/main/resources/stacks/HDP/2.3.GlusterFS/services/GLUSTERFS/configuration/hadoop-env.xml
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ambari-server/src/main/resources/stacks/HDP/2.2/services/HDFS/configuration/hadoop-env.xml
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ambari-server/src/main/resources/stacks/HDPWIN/2.1/services/HDFS/configuration/hadoop-env.xml
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ambari-server/src/test/resources/stacks/HDP/0.2/services/HDFS/configuration/hadoop-env.xml
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ambari-funtest/src/test/resources/stacks/HDP/0.2/services/HDFS/configuration/hadoop-env.xml
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ambari-server/src/main/resources/stacks/HDP/2.1.GlusterFS/services/GLUSTERFS/configuration/hadoop-env.xml
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ambari-server/src/main/resources/stacks/BIGTOP/0.8/services/HDFS/configuration/hadoop-env.xml
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ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/configuration/hadoop-env.xml
> DataNode JVM heap settings should include CMSInitiatingOccupancy
> ----------------------------------------------------------------
>
> Key: AMBARI-18694
> URL: https://issues.apache.org/jira/browse/AMBARI-18694
> Project: Ambari
> Issue Type: Improvement
> Affects Versions: 2.2.2
> Reporter: Xiaobing Zhou
> Assignee: Xiaobing Zhou
> Fix For: 2.5.0
>
> Attachments: AMBARI-18694.000.patch, AMBARI-18694.001.patch
>
>
> As HDFS-11047 reported, DirectoryScanner does scan by deep copying
> FinalizedReplica. In a deployment with 500,000+ blocks, we've seen the DN
> heap usage being accumulated to high peaks very quickly. Deep copies of
> FinalizedReplica will make DN heap usage even worse if directory scans are
> scheduled more frequently.
> Another factor is that huge number of ScanInfo instances corresponding to
> HDFS blocks are lingering in garbage to eat many heap memories until a full
> GC takes place.
> This proposes adding JVM settings to force GC more frequently to release
> DataNode heap consumed as a result of two aforementioned reasons, i.e. add
> the options to HADOOP_DATANODE_OPTS
> {noformat}
> -XX:CMSInitiatingOccupancyFraction=70 -XX:+UseCMSInitiatingOccupancyOnly
> -XX:ConcGCThreads=8 -XX:+UseConcMarkSweepGC
> {noformat}
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