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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4595) When short circuit read is fails, DFSClient does not fallback to regular reads
Date Thu, 14 Mar 2013 13:06:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13602243#comment-13602243
] 

Hudson commented on HDFS-4595:
------------------------------

Integrated in Hadoop-Hdfs-trunk #1344 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1344/])
    HDFS-4595. When short circuit read is fails, DFSClient does not fallback to regular reads.
Contributed by Suresh Srinivas. (Revision 1456047)

     Result = FAILURE
suresh : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1456047
Files : 
* /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/BlockReaderLocal.java
* /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/DFSInputStream.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestShortCircuitLocalRead.java

                
> When short circuit read is fails, DFSClient does not fallback to regular reads
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-4595
>                 URL: https://issues.apache.org/jira/browse/HDFS-4595
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 2.0.0-alpha
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>             Fix For: 2.0.5-beta
>
>         Attachments: HDFS-4595.patch, HDFS-4595.patch, HDFS-4595.patch, HDFS-4595.patch
>
>
> In 1.0, when short circuit is disallowed for a user, the DFSClient disables short circuit
and falls back to the regular socket based reads over DataTransferProtocol. In release 2.0,
this fallback functionality is not working.

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