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From "Nicolas Spiegelberg (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1186) 0.20: DNs should interrupt writers at start of recovery
Date Thu, 11 Nov 2010 18:53:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931130#action_12931130
] 

Nicolas Spiegelberg commented on HDFS-1186:
-------------------------------------------

Is there a reason why this is 0.20-append only?  What did 0.21 & 0.22 do to fix this issue?

> 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
>         Attachments: 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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