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https://issues.apache.org/jira/browse/MAPREDUCE-6204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14259797#comment-14259797
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sam liu commented on MAPREDUCE-6204:
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For many deprecated properties, hadoop code always set its value to its new
version of property. Absolutely, this solution is clear and won't bring any
misunderstanding on the conception of 'deprecation'.
However, for the deprecated property "mapred.child.java.opts", hadoop uses a
different method: it won't update the value of its new versions
MRJobConfig.MAP_JAVA_OPTS and MRJobConfig.REDUCE_JAVA_OPTS. Yes, finally hadoop
will set a correct value on the classpath, however the program like MapReduce
could not get correct value of MRJobConfig.MAP_JAVA_OPTS and
MRJobConfig.REDUCE_JAVA_OPTS: it definately bring confusing to the users.
Furthermore, this ut will fail without this patch on ppc64 platform, but could
pass on the same env with this patch. Actually the root cause is the
insuffcient completion of the deprecation of property "mapred.child.java.opts".
We could not say this patch is useless or simply pass the buck to 'env issue':
if this is an env issue, this ut should fail on the ppc64 platform either with
the deprecated property "mapred.child.java.opts" or with the new version of
properties MRJobConfig.MAP_JAVA_OPTS and MRJobConfig.REDUCE_JAVA_OPTS.
Therefore this patch is necessary and could remedy the insuffcient completion
of the deprecation of property "mapred.child.java.opts".
> TestJobCounters should use new properties instead
> JobConf.MAPRED_TASK_JAVA_OPTS
> -------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6204
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6204
> Project: Hadoop Map/Reduce
> Issue Type: Test
> Components: test
> Affects Versions: 2.6.0
> Reporter: sam liu
> Assignee: sam liu
> Priority: Minor
> Attachments: MAPREDUCE-6204-1.patch, MAPREDUCE-6204.patch
>
>
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