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From "Patrick Taylor Ramsey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BIGTOP-552) Enable HDFS durable sync
Date Mon, 23 Apr 2012 20:42:33 GMT

    [ https://issues.apache.org/jira/browse/BIGTOP-552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13259931#comment-13259931
] 

Patrick Taylor Ramsey commented on BIGTOP-552:
----------------------------------------------

This patch is now in branch-0.3, as it was intended to be last Friday.  Apologies for the
oversight, and thanks again for taking the time to contribute.
                
> Enable HDFS durable sync
> ------------------------
>
>                 Key: BIGTOP-552
>                 URL: https://issues.apache.org/jira/browse/BIGTOP-552
>             Project: Bigtop
>          Issue Type: Bug
>          Components: Deployment
>    Affects Versions: 0.3.0
>            Reporter: Michael Morello
>            Assignee: Patrick Taylor Ramsey
>             Fix For: 0.4.0
>
>         Attachments: BIGTOP-552.patch
>
>
> According to the HBase book () :
> {quote}
> HBase will lose data unless it is running on an HDFS that has a durable sync implementation.
Hadoop 0.20.2, Hadoop 0.20.203.0, and Hadoop 0.20.204.0 DO NOT have this attribute. Currently
only Hadoop versions 0.20.205.x or any release in excess of this version -- this includes
hadoop 1.0.0 -- have a working, durable sync [6]. Sync has to be explicitly enabled by setting
dfs.support.append equal to true on both the client side -- in hbase-site.xml -- and on the
serverside in hdfs-site.xml (The sync facility HBase needs is a subset of the append code
path).
> {quote}
> [http://hbase.apache.org/book.html#hadoop]

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