Aaron T. Myers created HDFS-4739: ------------------------------------ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira