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Posted to hdfs-dev@hadoop.apache.org by "Todd Lipcon (Resolved) (JIRA)" <ji...@apache.org> on 2011/10/03 23:49:35 UTC

[jira] [Resolved] (HDFS-1186) 0.20: DNs should interrupt writers at start of recovery

     [ https://issues.apache.org/jira/browse/HDFS-1186?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon resolved HDFS-1186.
-------------------------------

       Resolution: Fixed
    Fix Version/s:     (was: 0.20-append)
     Hadoop Flags: Reviewed

Suresh committed this for 0.20.205
                
> 0.20: DNs should interrupt writers at start of recovery
> -------------------------------------------------------
>
>                 Key: HDFS-1186
>                 URL: https://issues.apache.org/jira/browse/HDFS-1186
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 0.20-append
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Blocker
>             Fix For: 0.20.205.0
>
>         Attachments: HDFS-1186.20s.1.patch, HDFS-1186.20s.patch, hdfs-1186.txt
>
>
> When block recovery starts (eg due to NN recovering lease) it needs to interrupt any writers currently writing to those blocks. Otherwise, an old writer (who hasn't realized he lost his lease) can continue to write+sync to the blocks, and thus recovery ends up truncating data that has been sync()ed.

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