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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3906) QJM: quorum timeout on failover with large log segment
Date Tue, 11 Sep 2012 05:08:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452719#comment-13452719
] 

Aaron T. Myers commented on HDFS-3906:
--------------------------------------

+1, the patch looks good to me, and I agree that the refactor makes things a little clearer.
                
> QJM: quorum timeout on failover with large log segment
> ------------------------------------------------------
>
>                 Key: HDFS-3906
>                 URL: https://issues.apache.org/jira/browse/HDFS-3906
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: QuorumJournalManager (HDFS-3077)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>         Attachments: hdfs-3906.txt
>
>
> In doing some stress tests, I ran into an issue with failover if the current edit log
segment written by the old active is large. With a 327MB log segment containing 6.4M transactions,
the JN took ~11 seconds to read and validate it during the recovery step. This was longer
than the 10 second timeout for createNewEpoch, which caused the recovery to fail.

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