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  1. Hadoop HDFS
  2. HDFS-12744

More logs when short-circuit read is failed and disabled

    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.9.0, 3.0.0
    • Component/s: datanode
    • Labels:
    • Hadoop Flags:
      Reviewed

      Description

      Short-circuit read (SCR) failed with following error

      2017-10-21 16:42:28,024 WARN  [B.defaultRpcServer.handler=7,queue=7,port=16020] 
      impl.BlockReaderFactory: BlockReaderFactory(xxx): unknown response code ERROR
      while attempting to set up short-circuit access. Block xxx is not valid
      

      then short-circuit read is disabled for 10 minutes without any warning message given in the log. This causes us spent some more time to figure out why we had a long time window that SCR was not working. Propose to add a warning log (other places already did) to indicate SCR is disabled and some more logging in DN to display what happened.

        Attachments

        1. HDFS-12744.002.patch
          2 kB
          Weiwei Yang
        2. HDFS-12744.001.patch
          2 kB
          Weiwei Yang

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              • Assignee:
                cheersyang Weiwei Yang
                Reporter:
                cheersyang Weiwei Yang
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                Dates

                • Created:
                  Updated:
                  Resolved: