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https://issues.apache.org/jira/browse/MAPREDUCE-5460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13740295#comment-13740295
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Chris Nauroth commented on MAPREDUCE-5460:
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Here is what I tested in my {{mapred-site.xml}}:
{code}
<property>
<name>yarn.app.mapreduce.am.command-opts</name>
<value>-Xmx1024m -verbose:gc -Xloggc:/tmp/mr-am-@[email protected]</value>
</property>
{code}
The resulting GC log file was /tmp/mr-am-@[email protected] with no substitution.
This feature does work correctly inside the {{mapred.child.java.opts}} property
for map and reduce task processes. I only see the problem with
{{yarn.app.mapreduce.am.command-opts}}.
Either there is a bug, which would require a code fix, or the feature isn't
really supported for the AM, which would require a documentation fix. I would
prefer that we do support replacement using the unique application ID, because
it would be handy to separate GC logs and other things for the AM just like we
do for the map and reduce tasks.
> MR AppMaster command options does not replace @taskid@ with the current task
> ID.
> --------------------------------------------------------------------------------
>
> Key: MAPREDUCE-5460
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5460
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: applicationmaster, mrv2
> Affects Versions: 3.0.0, 2.1.1-beta
> Reporter: Chris Nauroth
>
> The description of {{yarn.app.mapreduce.am.command-opts}} in
> mapred-default.xml states that occurrences of {{@taskid@}} will be replaced
> by the current task ID. This substitution is not happening.
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