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https://issues.apache.org/jira/browse/MAPREDUCE-6205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
sam liu updated MAPREDUCE-6205:
-------------------------------
Affects Version/s: trunk
Status: Patch Available (was: Open)
If we only set value "-Xms32m -Xmx1G" to the deprecated property
"mapred.child.java.opts" before MR job execution:
- Without this patch, during map/reduce tasks execution, we can NOT get correct
value of MRJobConfig.MAP_JAVA_OPTS and MRJobConfig.REDUCE_JAVA_OPTS, but get
null value:
MAPRED_TASK_JAVA_OPTS=-Xms32m -Xmx1G
MRJobConfig.MAP_JAVA_OPTS=null
MRJobConfig.REDUCE_JAVA_OPTS=null
- With this patch, during map/reduce tasks execution, we can get correct value
of them:
MAPRED_TASK_JAVA_OPTS=-Xms32m -Xmx1G
MRJobConfig.MAP_JAVA_OPTS=-Xms32m -Xmx1G
MRJobConfig.REDUCE_JAVA_OPTS=-Xms32m -Xmx1G
> Updated 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.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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