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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMBARI-18694) DataNode JVM heap settings should include CMSInitiatingOccupancy
Date Fri, 28 Oct 2016 22:21:58 GMT

    [ https://issues.apache.org/jira/browse/AMBARI-18694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15616773#comment-15616773
] 

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])
* (edit) ambari-server/src/test/resources/stacks_with_common_services/HDP/0.2/services/HDFS/configuration/hadoop-env.xml
* (edit) ambari-server/src/main/resources/stacks/HDPWIN/2.2/services/HDFS/configuration/hadoop-env.xml
* (edit) ambari-server/src/test/resources/stacks_with_extensions/HDP/0.2/services/HDFS/configuration/hadoop-env.xml
* (edit) ambari-server/src/main/resources/stacks/HDP/2.0.6.GlusterFS/services/GLUSTERFS/configuration/hadoop-env.xml
* (edit) ambari-server/src/main/resources/stacks/HDP/2.3.GlusterFS/services/GLUSTERFS/configuration/hadoop-env.xml
* (edit) ambari-server/src/main/resources/stacks/HDP/2.2/services/HDFS/configuration/hadoop-env.xml
* (edit) ambari-server/src/main/resources/stacks/HDPWIN/2.1/services/HDFS/configuration/hadoop-env.xml
* (edit) ambari-server/src/test/resources/stacks/HDP/0.2/services/HDFS/configuration/hadoop-env.xml
* (edit) ambari-funtest/src/test/resources/stacks/HDP/0.2/services/HDFS/configuration/hadoop-env.xml
* (edit) ambari-server/src/main/resources/stacks/HDP/2.1.GlusterFS/services/GLUSTERFS/configuration/hadoop-env.xml
* (edit) ambari-server/src/main/resources/stacks/BIGTOP/0.8/services/HDFS/configuration/hadoop-env.xml
* (edit) 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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