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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6115) flush() should be called for every append on block scan verification log
Date Wed, 26 Mar 2014 17:00:22 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo Nicholas Sze updated HDFS-6115:
--------------------------------------

        Priority: Minor  (was: Major)
    Hadoop Flags: Reviewed

+1 patch looks good.

> flush() should be called for every append on block scan verification log
> ------------------------------------------------------------------------
>
>                 Key: HDFS-6115
>                 URL: https://issues.apache.org/jira/browse/HDFS-6115
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 2.3.0, 2.4.0
>            Reporter: Vinayakumar B
>            Assignee: Vinayakumar B
>            Priority: Minor
>         Attachments: HDFS-6115.patch
>
>
> {{RollingLogsImpl#out}} is  {{PrintWriter}} and it have the default buffersize of 8kB.
> So until the 8kB buffer is filled all scan verification entries will not be flushed,
hence there will be chance loosing this scan information if the datanode gets restarted. And
One more scan will happen for these blocks.
> 8kB will have ~80 entries, so 80 blocks needs to be re-scanned again.



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