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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6061) Allow dfs.datanode.shared.file.descriptor.path to contain multiple entries and fall back when needed
Date Thu, 06 Mar 2014 14:54:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13922587#comment-13922587
] 

Hudson commented on HDFS-6061:
------------------------------

SUCCESS: Integrated in Hadoop-Mapreduce-trunk #1718 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1718/])
HDFS-6061. Allow dfs.datanode.shared.file.descriptor.path to contain multiple entries and
fall back when needed (cmccabe) (cmccabe: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1574796)
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/nativeio/SharedFileDescriptorFactory.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/nativeio/TestSharedFileDescriptorFactory.java
* /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/DFSConfigKeys.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/ShortCircuitRegistry.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/hdfs/client/TestShortCircuitShm.java


> Allow dfs.datanode.shared.file.descriptor.path to contain multiple entries and fall back
when needed
> ----------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-6061
>                 URL: https://issues.apache.org/jira/browse/HDFS-6061
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: 2.4.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>             Fix For: 2.4.0
>
>         Attachments: HDFS-6061.001.patch, HDFS-6061.002.patch
>
>
> In {{SharedFileDescriptorFactory}}, it would be nice if dfs.datanode.shared.file.descriptor.path
could contain multiple entries and allow fallback between them.  That way, if a user doesn't
have {{/dev/shm}} configured (the current default), the user could use {{/tmp}}.  This is
mainly a concern on BSDs and some other systems where {{/dev/shm}} doesn't exist.



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