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From "Aaron T. Myers (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2794) HA: Active NN may purge edit log files before standby NN has a chance to read them
Date Mon, 16 Jan 2012 06:45:40 GMT
HA: Active NN may purge edit log files before standby NN has a chance to read them
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                 Key: HDFS-2794
                 URL: https://issues.apache.org/jira/browse/HDFS-2794
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ha, name-node
    Affects Versions: HA branch (HDFS-1623)
            Reporter: Aaron T. Myers
            Assignee: Aaron T. Myers


Given that the active NN is solely responsible for purging finalized edit log segments, and
given that the active NN has no way of knowing when the standby reads edit logs, it's  possible
that the standby NN could fail to read all edits it needs before the active purges the files.

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