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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