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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2525) Race between BlockPoolSliceScanner and append
Date Wed, 02 Nov 2011 20:59:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13142512#comment-13142512

Eli Collins commented on HDFS-2525:

This patch should also update TestAppendDifferentChecksums to remove the disabling of the
block scanner which was introduced in HDFS-2130 (see the comment in the test for details).
> 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
>            Priority: Critical
> 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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