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Date: Thu, 7 Nov 2013 19:35:18 +0000 (UTC)
From: "Arpit Agarwal (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-5475) NN should not allow more than one
 replica per storage
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Arpit Agarwal created HDFS-5475:
-----------------------------------

             Summary: NN should not allow more than one replica per storage
                 Key: HDFS-5475
                 URL: https://issues.apache.org/jira/browse/HDFS-5475
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: namenode
    Affects Versions: Heterogeneous Storage (HDFS-2832)
            Reporter: Arpit Agarwal
            Assignee: Arpit Agarwal


NN chooses a provisional target storage when allocating a new block and records that block in the blockList of that storage. However the datanode is free to choose a different storage for the block. On the next block report the NN ends up with two blockList entries for the same replica+DN combination.


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