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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2709) HA: Appropriately handle error conditions in EditLogTailer
Date Tue, 20 Dec 2011 22:51:30 GMT
HA: Appropriately handle error conditions in EditLogTailer
----------------------------------------------------------

                 Key: HDFS-2709
                 URL: https://issues.apache.org/jira/browse/HDFS-2709
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ha, name-node
    Affects Versions: HA branch (HDFS-1623)
            Reporter: Todd Lipcon
            Assignee: Aaron T. Myers
            Priority: Critical


Currently if the edit log tailer experiences an error replaying edits in the middle of a file,
it will go back to retrying from the beginning of the file on the next tailing iteration.
This is incorrect since many of the edits will have already been replayed, and not all edits
are idempotent.

Instead, we either need to (a) support reading from the middle of a finalized file (ie skip
those edits already applied), or (b) abort the standby if it hits an error while tailing.
If "a" isn't simple, let's do "b" for now and come back to 'a' later since this is a rare
circumstance and better to abort than be incorrect.

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