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Posted to hdfs-dev@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2014/08/28 19:28:08 UTC

[jira] [Created] (HDFS-6964) NN fails to fix under replication leading to data loss

Daryn Sharp created HDFS-6964:
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             Summary: NN fails to fix under replication leading to data loss
                 Key: HDFS-6964
                 URL: https://issues.apache.org/jira/browse/HDFS-6964
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.0.0-alpha, 3.0.0
            Reporter: Daryn Sharp
            Priority: Blocker


We've encountered lost blocks due to node failure even when there is ample time to fix the under-replication.

2 nodes were lost.  The 3rd node with the last remaining replicas averaged 1 copy block per heartbeat (3s) until ~7h later when that node was lost resulting in over 50 lost blocks.  When the node was restarted and sent its BR the NN immediately began fixing the replication.

In another data loss event, over 150 blocks were lost due to node failure but the timing of the node loss is not known so there may have been inadequate time to fix the under-replication unlike the first case.



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