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Posted to hdfs-dev@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2013/01/09 22:30:12 UTC

[jira] [Created] (HDFS-4379) DN block reports should include a sequence number

Daryn Sharp created HDFS-4379:
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             Summary: DN block reports should include a sequence number
                 Key: HDFS-4379
                 URL: https://issues.apache.org/jira/browse/HDFS-4379
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode, namenode
    Affects Versions: 2.0.0-alpha, 3.0.0
            Reporter: Daryn Sharp


Block reports should include a monotonically increasing sequence number.  If the sequence starts from zero, this will aid the NN in being able to distinguish a DN restart (seqNum == 0) versus a re-registration after network interruption (seqNum != 0).  The NN may also use it to identify and skip already processed block reports.

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