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Date: Thu, 6 Sep 2012 18:02:08 +1100 (NCT)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Resolved] (HDFS-3726) QJM: if a logger misses an RPC, don't
 retry that logger until next segment
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     [ https://issues.apache.org/jira/browse/HDFS-3726?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon resolved HDFS-3726.
-------------------------------

       Resolution: Fixed
    Fix Version/s: QuorumJournalManager (HDFS-3077)
     Hadoop Flags: Reviewed

Committed to branch, thanks for the review.
                
> QJM: if a logger misses an RPC, don't retry that logger until next segment
> --------------------------------------------------------------------------
>
>                 Key: HDFS-3726
>                 URL: https://issues.apache.org/jira/browse/HDFS-3726
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: QuorumJournalManager (HDFS-3077)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: QuorumJournalManager (HDFS-3077)
>
>         Attachments: hdfs-3726.txt, hdfs-3726.txt
>
>
> Currently, if a logger misses an RPC in the middle of a log segment, or misses the {{startLogSegment}} RPC (eg it was down or network was disconnected during that time period), then it will throw an exception on every subsequent {{journal()}} call in that segment, since it knows that it missed some edits in the middle.
> We should change this exception to a specific IOE subclass, and have the client side of QJM detect the situation and stop sending IPCs until the next {{startLogSegment}} call.
> This isn't critical for correctness but will help reduce log spew on both sides.

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