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From "John Vines (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1637) Update HDFS append/sync precondition check for Hadoop 1.2
Date Wed, 16 Oct 2013 02:31:43 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13796343#comment-13796343
] 

John Vines commented on ACCUMULO-1637:
--------------------------------------

One of the releases since 1.04 added a centralized location for default
properties that you may be able to use.

Sent from my phone, please pardon the typos and brevity.



> Update HDFS append/sync precondition check for Hadoop 1.2
> ---------------------------------------------------------
>
>                 Key: ACCUMULO-1637
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1637
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.5.0
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>            Priority: Critical
>             Fix For: 1.5.1, 1.6.0
>
>
> Apache Hadoop 1.2.0 ships with the durable sync enabled by default and the support append
option marked as obsolete. Because of this, the check inside of TabletServer, meant to ensure
that the HDFS WAL can function properly, incorrectly fails as it doesn't know that dfs.durable.sync
is on by default.
> This can be worked around by specifying the old durable sync property in hdfs-site.xml:
> {noformat}
> <property>
>   <name>dfs.durable.sync</name>
>   <value>true</value>
> </property>
> {noformat}
> I'm not sure how to best way to address the differences between the newer and older versions
of Hadoop and their differing append support.
> Thanks to Carlos Mundi for pointing this out on user@a.a.o



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