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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9618) Add thread which detects JVM pauses
Date Tue, 04 Jun 2013 21:01:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13675235#comment-13675235
] 

Hadoop QA commented on HADOOP-9618:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12586143/hadoop-9618.txt
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common
hadoop-hdfs-project/hadoop-hdfs.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/2599//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/2599//console

This message is automatically generated.
                
> 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
>         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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