[jira] [Comment Edited] (ACCUMULO-1637) Update HDFS append/sync precondition check for Hadoop 1.2

["Josh Elser (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ACCUMULO-1637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13796402#comment-13796402 ] 

Josh Elser edited comment on ACCUMULO-1637 at 10/16/13 4:25 AM:
----------------------------------------------------------------

bq. The constants in DFSConfigKeys aren't stable between versions.

Right, that was the point of making the table in the description (as I figured was likely the case).


was (Author: elserj):
bq. The constants in DFSConfigKeys aren't stable between versions.

Right, that was the point of making the table in the description.

> 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
> 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|
> |2.0.x|defined|true|not present|no|
> |2.1.x|defined|true|not present|no|
> |2.2.0|defined|true|not present|no|



--
This message was sent by Atlassian JIRA
(v6.1#6144)