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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8863) The remiaing space check in BlockPlacementPolicyDefault is flawed
Date Thu, 06 Aug 2015 17:32:05 GMT
Kihwal Lee created HDFS-8863:
--------------------------------

             Summary: The remiaing space check in BlockPlacementPolicyDefault is flawed
                 Key: HDFS-8863
                 URL: https://issues.apache.org/jira/browse/HDFS-8863
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.6.0
            Reporter: Kihwal Lee
            Priority: Critical


The block placement policy calls {{DatanodeDescriptor#getRemaining(StorageType}}}} to check
whether the block is going to fit. Since the method is adding up all remaining spaces, namenode
can allocate a new block on a full node. This causes pipeline construction failure and {{abandonBlock}}.
If the cluster is nearly full, the client might hit this multiple times and the write can
fail permanently.



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