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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6046) add dfs.client.mmap.enabled
Date Tue, 04 Mar 2014 11:32:26 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13919282#comment-13919282
] 

Hudson commented on HDFS-6046:
------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk #1691 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1691/])
HDFS-6046. add dfs.client.mmap.enabled (cmccabe) (cmccabe: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1573887)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestEnhancedByteBufferAccess.java


> add dfs.client.mmap.enabled
> ---------------------------
>
>                 Key: HDFS-6046
>                 URL: https://issues.apache.org/jira/browse/HDFS-6046
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>    Affects Versions: 2.4.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>             Fix For: 2.4.0
>
>         Attachments: HDFS-6046.001.patch, HDFS-6046.002.patch, HDFS-6046.003.patch
>
>
> It would be nice to have a configuration variable, dfs.client.mmap.enabled. which would
disable mmap reads in the client.  This could come in handy for debugging or performance benchmarking.



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