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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12744) More logs when short-circuit read is failed and disabled
Date Mon, 30 Oct 2017 06:01:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12744?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Weiwei Yang updated HDFS-12744:
-------------------------------
    Attachment: HDFS-12744.001.patch

Two line changes in this patch,
1) Added a warning message when SCR is disabled.
2) Log the exception with stack trace to DN log when unknown error happens while requesting
SCR file descriptor, currently only the exception message is passed to the client without
any more logging, causing it's difficult to analysis what was wrong. 

> 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
>         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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