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From "John Vines (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1946) Include dfs.datanode.synconclose in hdfs configuration documentation
Date Tue, 03 Dec 2013 16:36:35 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13837865#comment-13837865
] 

John Vines commented on ACCUMULO-1946:
--------------------------------------

After reading a bit more about how long natural syncs can take (up to 30 seconds), then I
think it is feasible for it to occur. So yeah, it does apply to 1.4.5+, however substantially
less probable than the walog issue.

> Include dfs.datanode.synconclose in hdfs configuration documentation
> --------------------------------------------------------------------
>
>                 Key: ACCUMULO-1946
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1946
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: docs
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>             Fix For: 1.5.1, 1.6.0
>
>
> We should be including some writeup about dfs.datanode.synconclose in our documentation
surrounding the HDFS configuration as it better ensures that data is lost in the face of hard
shutdown (power loss) of the datanode process.



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