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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4288) NN accepts incremental BR as IBR in safemode
Date Fri, 07 Dec 2012 20:19:20 GMT
Daryn Sharp created HDFS-4288:
---------------------------------

             Summary: NN accepts incremental BR as IBR in safemode
                 Key: HDFS-4288
                 URL: https://issues.apache.org/jira/browse/HDFS-4288
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.0.0-alpha, 0.23.0, 3.0.0
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp
            Priority: Critical


If a DN is ready to send an incremental BR and the NN goes down, the DN will repeatedly try
to reconnect.  The NN will then process the DN's incremental BR as an initial BR.  The NN
now thinks the DN has only a few blocks, and will ignore all subsequent BRs from that DN until
out of safemode -- which it may never do because of all the "missing" blocks on the affected
DNs.

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