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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-3914) QJM: acceptRecovery should abort current segment
Date Mon, 10 Sep 2012 23:22:07 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon resolved HDFS-3914.
-------------------------------

       Resolution: Fixed
    Fix Version/s: QuorumJournalManager (HDFS-3077)
     Hadoop Flags: Reviewed
    
> QJM: acceptRecovery should abort current segment
> ------------------------------------------------
>
>                 Key: HDFS-3914
>                 URL: https://issues.apache.org/jira/browse/HDFS-3914
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: QuorumJournalManager (HDFS-3077)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: QuorumJournalManager (HDFS-3077)
>
>         Attachments: hdfs-3914.txt
>
>
> Found this bug with randomized testing. The following sequence causes a problem:
> - JN writing segment starting at txid 1, and successfully wrote txid 1, but no more
> - JN becomes partitioned from NN, and a new NN takes over
> - new NN is also partitioned for the "prepareRecovery" phase of recovery, but properly
connects for the "acceptRecovery" call
> - acceptRecovery copies over a longer log segment (eg txns 1-3) from a good logger
> - new NN calls finalizeLogSegment(), but gets the following error: JournalOutOfSyncException:
Trying to finalize in-progress log segment 1 to end at txid 3 but only written up to txid
1
> This is because the "syncLog" call (which copies the new segment) isn't properly aborting
the old segment before replacing it.

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