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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3900) QJM: avoid validating log segments on log rolls
Date Fri, 07 Sep 2012 03:24:08 GMT
Todd Lipcon created HDFS-3900:

             Summary: QJM: avoid validating log segments on log rolls
                 Key: HDFS-3900
                 URL: https://issues.apache.org/jira/browse/HDFS-3900
             Project: Hadoop HDFS
          Issue Type: Sub-task
    Affects Versions: QuorumJournalManager (HDFS-3077)
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon

Currently, we are paranoid and validate every log segment when it is finalized. For the a
log segment that has been written entirely by one writer, with no recovery in between, this
is overly paranoid (we don't do this for local journals). It also causes log rolls to be slow
and take time linear in the size of the segment. Instead, we should optimize this path to
simply trust that the segment is correct so long as the txids match up as expected.

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