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