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Posted to hdfs-dev@hadoop.apache.org by "Brandon Li (JIRA)" <ji...@apache.org> on 2014/10/17 22:01:34 UTC

[jira] [Created] (HDFS-7259) Unresponseive NFS mount point due to deferred COMMIT response

Brandon Li created HDFS-7259:
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             Summary: Unresponseive NFS mount point due to deferred COMMIT response
                 Key: HDFS-7259
                 URL: https://issues.apache.org/jira/browse/HDFS-7259
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: nfs
    Affects Versions: 2.2.0
            Reporter: Brandon Li
            Assignee: Brandon Li


Since the gateway can't commit random write, it caches the COMMIT requests in a queue and send back response only when the data can be committed or stream timeout (failure in the latter case). This could cause problems two patterns:
(1) file uploading failure 
(2) the mount dir is stuck on the same client, but other NFS clients can still access NFS gateway.

The error pattern (2) is because there are too many COMMIT requests pending, so the NFS client can't send any other requests(e.g., for "ls") to NFS gateway with its pending requests limit.



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