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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14522) Document and/or disable hsperfdata GC pauses
Date Wed, 30 Sep 2015 16:36:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14937488#comment-14937488
] 

Hadoop QA commented on HBASE-14522:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12764420/HBASE-14522.patch
  against master branch at commit f3dff052a6a74191f2520a724de483db4c064292.
  ATTACHMENT ID: 12764420

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

    {color:green}+0 tests included{color}.  The patch appears to be a documentation patch
that doesn't require tests.

    {color:green}+1 hadoop versions{color}. The patch compiles with all supported hadoop versions
(2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.0 2.6.1 2.7.0 2.7.1)

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

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

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

    {color:green}+1 checkstyle{color}.  The applied patch does not increase the total number
of checkstyle errors

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

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

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines longer than 100

  {color:green}+1 site{color}.  The mvn post-site goal succeeds with this patch.

     {color:red}-1 core tests{color}.  The patch failed these unit tests:
     

     {color:red}-1 core zombie tests{color}.  There are 3 zombie test(s): 	at org.apache.hadoop.hbase.client.TestFromClientSide.testUnmanagedHConnectionReconnect(TestFromClientSide.java:4081)
	at org.apache.hadoop.hbase.client.TestFromClientSide.testUnmanagedHConnectionReconnect(TestFromClientSide.java:4081)

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/15829//testReport/
Release Findbugs (version 2.0.3) 	warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/15829//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/15829//artifact/patchprocess/checkstyle-aggregate.html

  Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/15829//console

This message is automatically generated.

> Document and/or disable hsperfdata GC pauses
> --------------------------------------------
>
>                 Key: HBASE-14522
>                 URL: https://issues.apache.org/jira/browse/HBASE-14522
>             Project: HBase
>          Issue Type: Task
>          Components: documentation, Performance
>            Reporter: Nick Dimiduk
>            Assignee: Lars Francke
>         Attachments: HBASE-14522.patch
>
>
> {quote}
> The JVM by default exports statistics by mmap-ing a file in /tmp (hsperfdata). On Linux,
modifying a memory mapped file can block until disk I/O completes, which can be hundreds of
milliseconds. Since the JVM modifies these statistics during garbage collection and safepoints,
this causes pauses that are hundreds of milliseconds long.
> {quote}
> Via [JVM mmap pause|http://www.evanjones.ca/jvm-mmap-pause.html].
> We should add {{-XX:+PerfDisableSharedMem}} to our default options as was apparently
done in CASSANDRA-9242 and/or document the presence of this bug so operators know to use tmpfs.
> Hat-tip [~vrodionov]



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