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https://issues.apache.org/jira/browse/MAPREDUCE-6205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14258815#comment-14258815
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Masatake Iwasaki commented on MAPREDUCE-6205:
---------------------------------------------
The value of "mapred.child.java.opts" seems to be used as fallback in
MapReduceChildJVM#getChildJavaOpts. Is this not enough?
{code}
private static String getChildJavaOpts(JobConf jobConf, boolean isMapTask) {
String userClasspath = "";
String adminClasspath = "";
if (isMapTask) {
userClasspath =
jobConf.get(
JobConf.MAPRED_MAP_TASK_JAVA_OPTS,
jobConf.get(
JobConf.MAPRED_TASK_JAVA_OPTS,
JobConf.DEFAULT_MAPRED_TASK_JAVA_OPTS)
);
{code}
> 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.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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