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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1637) Update HDFS append/sync precondition check for Hadoop 1.2
Date Fri, 18 Oct 2013 02:03:42 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13798717#comment-13798717
] 

ASF subversion and git services commented on ACCUMULO-1637:
-----------------------------------------------------------

Commit e498ebb802f7f07827b8f0c0a067f8536322b692 in branch refs/heads/master from [~elserj]
[ https://git-wip-us.apache.org/repos/asf?p=accumulo.git;h=e498ebb ]

Merge branch '1.5.1-SNAPSHOT'

Conflicts:
	server/src/main/java/org/apache/accumulo/server/tabletserver/TabletServer.java

ACCUMULO-1637 Expanding the tests to account for the VolumeManager
changes in 1.6


> 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
>
>         Attachments: 0001-ACCUMULO-1637-Rework-the-hadoop-append-sync-checks-t.patch
>
>
> 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
> Using this table to track the presence of these variables and their default from hdfs/o/a/h/h/DFSConfigKeys
and from the codebase when there is no config parameter for it.
> ||Version||DFSConfigKeys.DFS_SUPPORT_APPEND_KEY||DFSConfigKeys.DFS_SUPPORT_APPEND_DEFAULT||"dfs.durable.sync"||Specific
Configuration Required||
> |0.20.205.0|defined|false|not present|yes|
> |0.23.x|defined|true|not present|no|
> |1.0.x|defined|false|not present|yes|
> |1.1.X|not present|absent|implicit "true"|no|
> |1.2.X|not present|absent|implicit "true"|no|
> |2.0.x|defined|true|not present|no|
> |2.1.x|defined|true|not present|no|
> |2.2.0|defined|true|not present|no|



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