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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9618) Add thread which detects JVM pauses
Date Wed, 17 Jul 2013 10:54:56 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13710955#comment-13710955
] 

Hudson commented on HADOOP-9618:
--------------------------------

SUCCESS: Integrated in Hadoop-Yarn-trunk #273 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/273/])
HADOOP-9618.  thread which detects GC pauses (Todd Lipcon via Colin Patrick McCabe) (cmccabe:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1503806)
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/JvmPauseMonitor.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNode.java

                
> Add thread which detects JVM pauses
> -----------------------------------
>
>                 Key: HADOOP-9618
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9618
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: util
>    Affects Versions: 3.0.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 2.2.0
>
>         Attachments: hadoop-9618.txt
>
>
> Often times users struggle to understand what happened when a long JVM pause (GC or otherwise)
causes things to malfunction inside a Hadoop daemon. For example, a long GC pause while logging
an edit to the QJM may cause the edit to timeout, or a long GC pause may make other IPCs to
the NameNode timeout. We should add a simple thread which loops on 1-second sleeps, and if
the sleep ever takes significantly longer than 1 second, log a WARN. This will make GC pauses
obvious in logs.

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