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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4739) NN can miscalculate the number of extra edit log segments to retain
Date Wed, 24 Apr 2013 17:47:19 GMT
Aaron T. Myers created HDFS-4739:
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             Summary: NN can miscalculate the number of extra edit log segments to retain
                 Key: HDFS-4739
                 URL: https://issues.apache.org/jira/browse/HDFS-4739
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.0.4-alpha
            Reporter: Aaron T. Myers
            Assignee: Aaron T. Myers


The code in NNStorageRetentionManager#purgeOldStorage is intended to place a cap on the number
of _extra_ edit log segments retained beyond what is strictly required to replay the FS history
since the last fsimage. In fact this code currently places a limit on the _total_ number of
extra edit log segments. If the number of required segments is greater than the configured
cap, there will be no data loss, but an ugly error will be thrown and the NN will fail to
start.

The fix is simple, and in the meantime a work-around is just to raise the value of dfs.namenode.max.extra.edits.segments.retained
and start the NN.

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