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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-920) Add jvm params introduced in MAPREDUCE-478 to mapred-default.xml
Date Thu, 12 May 2011 05:26:47 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032259#comment-13032259

Todd Lipcon commented on MAPREDUCE-920:

Since we have the "updatingResource" map in Configuration, could we add something like Configuration.isOverriddenByUser("key")
which checks whether the current setting is from X-default.xml within a jar vs some other
place? There's some subtlety here in terms of dealing with jobconfs as well, but it probably
isn't impossible to workaround.

(It seems bad to deprecate a config, but then not document its replacements!)

> Add jvm params introduced in MAPREDUCE-478 to mapred-default.xml
> ----------------------------------------------------------------
>                 Key: MAPREDUCE-920
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-920
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Ramya R
>            Assignee: Alejandro Abdelnur
>            Priority: Minor
>              Labels: newbie
>             Fix For: 0.22.0
>         Attachments: MAPREDUCE-920.patch
> mapred-default.xml still provides definition for old params which were deprecated in
MAPREDUCE:478. It should be changed to define the new params such as  mapred.map.child.java.opts,
mapred.reduce.child.java.opts, mapred.map.child.env, mapred.reduce.child.env, mapred.map.child.ulimit,

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