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