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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10840) Fix OutOfMemoryError caused by metrics system in Azure File System
Date Thu, 17 Jul 2014 13:46:08 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14064920#comment-14064920
] 

Hudson commented on HADOOP-10840:
---------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk #1807 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1807/])
HADOOP-10840. Fix OutOfMemoryError caused by metrics system in Azure File System. Contributed
by Shanyu Zhao. (cnauroth: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1611247)
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/trunk/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/NativeAzureFileSystem.java
* /hadoop/common/trunk/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/metrics/AzureFileSystemMetricsSystem.java
* /hadoop/common/trunk/hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azure/AzureBlobStorageTestAccount.java
* /hadoop/common/trunk/hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azure/NativeAzureFileSystemBaseTest.java


> 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
>             Fix For: 3.0.0
>
>         Attachments: HADOOP-10840.1.patch, HADOOP-10840.2.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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