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https://issues.apache.org/jira/browse/HDFS-12744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16226256#comment-16226256
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John Zhuge commented on HDFS-12744:
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+1 LGTM
> 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
> Labels: supportability
> Attachments: HDFS-12744.001.patch
>
>
> 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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