[jira] [Created] (HDFS-7915) The DataNode can sometimes allocate a ShortCircuitShm slot and fail to tell the DFSClient about it because of a network error

["Colin Patrick McCabe (JIRA)" <ji...@apache.org>]

Colin Patrick McCabe created HDFS-7915:
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             Summary: The DataNode can sometimes allocate a ShortCircuitShm slot and fail to tell the DFSClient about it because of a network error
                 Key: HDFS-7915
                 URL: https://issues.apache.org/jira/browse/HDFS-7915
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.7.0
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe


The DataNode can sometimes allocate a ShortCircuitShm slot and fail to tell the DFSClient about it because of a network error.  In {{DataXceiver#requestShortCircuitFds}}, the DataNode can succeed at the first part (mark the slot as used) and fail at the second part (tell the DFSClient what it did). The "try" block for unregistering the slot only covers a failure in the first part, not the second part. In this way, a divergence can form between the views of which slots are allocated on DFSClient and on server.



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