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https://issues.apache.org/jira/browse/HADOOP-10840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14064258#comment-14064258
 ] 

Hadoop QA commented on HADOOP-10840:
------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12656152/HADOOP-10840.1.patch
  against trunk revision .

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

    {color:green}+1 tests included{color}.  The patch appears to include 1 new 
or modified test files.

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

    {color:green}+1 javadoc{color}.  There were no new javadoc 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 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 core tests{color}.  The patch passed unit tests in 
hadoop-tools/hadoop-azure.

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

Test results: 
https://builds.apache.org/job/PreCommit-HADOOP-Build/4297//testReport/
Console output: 
https://builds.apache.org/job/PreCommit-HADOOP-Build/4297//console

This message is automatically generated.

> Fix OutOfMemoryError caused by metrics system in Azure File System
> ------------------------------------------------------------------
>
>                 Key: HADOOP-10840
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10840
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 2.4.1
>            Reporter: shanyu zhao
>            Assignee: shanyu zhao
>         Attachments: HADOOP-10840.1.patch, HADOOP-10840.patch
>
>
> In Hadoop 2.x the Hadoop File System framework changed and no cache is 
> implemented (refer to HADOOP-6356). This means for every WASB access, a new 
> NativeAzureFileSystem is created, along which a Metrics source created and 
> added to MetricsSystemImpl. Over time the sources accumulated, eating memory 
> and causing Java OutOfMemoryError.
> The fix is to utilize the unregisterSource() method added to MetricsSystem in 
> HADOOP-10839.



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