[jira] [Created] (HDFS-6750) The DataNode should use its shared memory segment to mark short-circuit replicas that have been unlinked as stale

[Colin Patrick McCabe (JIRA)]

Colin Patrick McCabe created HDFS-6750:
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             Summary: The DataNode should use its shared memory segment to mark 
short-circuit replicas that have been unlinked as stale
                 Key: HDFS-6750
                 URL: https://issues.apache.org/jira/browse/HDFS-6750
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: datanode, hdfs-client
    Affects Versions: 2.4.0
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe


The DataNode should mark short-circuit replicas that have been unlinked as 
stale.  This would prevent replicas that had been deleted from lingering in the 
DFSClient cache.  (At least for DFSClients that use shared memory; those 
without shared memory will still have to use the timeout method.)

Note that when a replica is stale, any ongoing reads or mmaps can still 
complete.  But stale replicas will be removed from the DFSClient cache once 
they're no longer in use.



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