Brandon Li created HDFS-5364:
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             Summary: Add OpenFileCtx cache
                 Key: HDFS-5364
                 URL: https://issues.apache.org/jira/browse/HDFS-5364
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Brandon Li
            Assignee: Brandon Li


NFS gateway can run out of memory when the stream timeout is set to a 
relatively long period(e.g., >1 minute) and user uploads thousands of files in 
parallel.  Each stream DFSClient creates a DataStreamer thread, and will 
eventually run out of memory by creating too many threads.

NFS gateway should have a OpenFileCtx cache to limit the total opened files. 



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