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From "Gera Shegalov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6205) Update the value of the new version properties of the deprecated property "mapred.child.java.opts"
Date Thu, 08 Jan 2015 00:13:34 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14268556#comment-14268556

Gera Shegalov commented on MAPREDUCE-6205:

I agree. I think the proposed deprecation chain handles this correctly but we should definitely
capture these requirements in unit tests. And I hope you can review it [~jlowe].

> Update the value of the new version properties of the deprecated property "mapred.child.java.opts"
> --------------------------------------------------------------------------------------------------
>                 Key: MAPREDUCE-6205
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6205
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: trunk
>            Reporter: sam liu
>            Assignee: sam liu
>            Priority: Minor
>         Attachments: MAPREDUCE-6205.003.patch, MAPREDUCE-6205.patch, MAPREDUCE-6205.patch
> In current hadoop code, the old property "mapred.child.java.opts" is deprecated and its
new versions are MRJobConfig.MAP_JAVA_OPTS and MRJobConfig.REDUCE_JAVA_OPTS. However, when
user set a value to the deprecated property "mapred.child.java.opts", hadoop won't automatically
update its new versions properties MRJobConfig.MAP_JAVA_OPTS("mapreduce.map.java.opts") and
MRJobConfig.REDUCE_JAVA_OPTS("mapreduce.reduce.java.opts"). As hadoop will update the new
version properties for many other deprecated properties, we also should support such feature
on the old property "mapred.child.java.opts", otherwise it might bring some imcompatible issues.

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