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From "Jitendra Nath Pandey (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2525) Race between BlockPoolSliceScanner and append
Date Tue, 14 Feb 2012 21:05:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13208009#comment-13208009
] 

Jitendra Nath Pandey commented on HDFS-2525:
--------------------------------------------

Is this an issue in trunk as well? If yes please provide a trunk patch.
                
> 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
>            Reporter: Todd Lipcon
>            Assignee: Brandon Li
>            Priority: Critical
>         Attachments: HDFS-2525-branch-0.23.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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