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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2525) Race between BlockPoolSliceScanner and append
Date Wed, 15 Feb 2012 19:07:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13208687#comment-13208687
] 

Hudson commented on HDFS-2525:
------------------------------

Integrated in Hadoop-Common-0.23-Commit #555 (See [https://builds.apache.org/job/Hadoop-Common-0.23-Commit/555/])
    Merged 1244640 from trunk for HDFS-2525. (Revision 1244642)

     Result = SUCCESS
jitendra : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1244642
Files : 
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolSliceScanner.java
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestAppendDifferentChecksum.java

                
> Race between BlockPoolSliceScanner and append
> ---------------------------------------------
>
>                 Key: HDFS-2525
>                 URL: https://issues.apache.org/jira/browse/HDFS-2525
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Todd Lipcon
>            Assignee: Brandon Li
>            Priority: Critical
>         Attachments: HDFS-2525-branch-0.23.patch, HDFS-2525.patch
>
>
> I wrote a test which runs append() in a loop on a single file with a single replica,
appending 0~100 bytes each time. If this races with the BlockPoolSliceScanner, I observe the
BlockPoolSliceScanner getting FNFE, then reporting the block as bad to the NN. This causes
the writer thread to loop forever on completeFile() since it doesn't see a valid replica.

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