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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4890) Stop generating/sending datanode work in standby mode
Date Thu, 06 Jun 2013 21:04:20 GMT
Kihwal Lee created HDFS-4890:

             Summary: Stop generating/sending datanode work in standby mode
                 Key: HDFS-4890
                 URL: https://issues.apache.org/jira/browse/HDFS-4890
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: ha, namenode
    Affects Versions: 2.1.0-beta
            Reporter: Kihwal Lee

If NN comes up in standby and stays that way, repl queues are empty so no work is generated
even though ReplicationMonitor is running. But if an ANN transitions to standby, more work
can be generated and sent. Also any remaining work will be sent to datanodes. 

Current code drains existing work and stops generating new work in safe mode. HDFS-4832 will
make it immediately stop in safe mode. Same can be done for standby.

This change was also suggested in HDFS-3744.

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