[jira] [Created] (HDFS-12744) More logs when short-circuit read is failed and disabled

["Weiwei Yang (JIRA)" <ji...@apache.org>]

Weiwei Yang created HDFS-12744:
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             Summary: More logs when short-circuit read is failed and disabled
                 Key: HDFS-12744
                 URL: https://issues.apache.org/jira/browse/HDFS-12744
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode
            Reporter: Weiwei Yang
            Assignee: Weiwei Yang


Short-circuit read (SCR) failed with following error

{noformat}
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
{noformat}

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.



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