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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2525) Race between BlockPoolSliceScanner and append
Date Mon, 10 Dec 2012 22:29:21 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2525?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-2525:
------------------------------

    Fix Version/s: 2.0.0-alpha
                   0.23.2

Setting fix versions - this was included in the 2.0.0 release as well as 0.23.2
                
> Race between BlockPoolSliceScanner and append
> ---------------------------------------------
>
>                 Key: HDFS-2525
>                 URL: https://issues.apache.org/jira/browse/HDFS-2525
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Todd Lipcon
>            Assignee: Brandon Li
>            Priority: Critical
>             Fix For: 0.23.2, 2.0.0-alpha
>
>         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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