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Posted to mapreduce-issues@hadoop.apache.org by "Harsh J (JIRA)" <ji...@apache.org> on 2012/05/18 22:21:10 UTC
[jira] [Commented] (MAPREDUCE-2637) Providing options to debug the
mapreduce user code (Mapper, Reducer, Combiner, Sort implementations)
[ https://issues.apache.org/jira/browse/MAPREDUCE-2637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279151#comment-13279151 ]
Harsh J commented on MAPREDUCE-2637:
------------------------------------
Shouldn't we raise issues on MRUNIT to tackle all debug-ability issues? I believe thats where it ought to go.
For developers of YARN framework who wish to debug at the container levels, the way is to do it via the IDE. We can repurpose this JIRA to have that documented.
> Providing options to debug the mapreduce user code (Mapper, Reducer, Combiner, Sort implementations)
> ----------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-2637
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2637
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: tasktracker
> Reporter: Devaraj K
> Assignee: Devaraj K
>
> Presently Hadoop provides "mapred.child.java.opts" configuration which can be used to set JVM options for Child JVM running Map or Reduce Task.
> If we need to remote debug the Child JVM, we can add remote debugging options to this configuration value.
> But this will work only for single Child JVM. Other children will fail as the remote debugging port is already used.
> We cannot specify the remote debugging port dynamically.
> As a result, it's not possible to remote debug multiple Child JVMs.
> As a solution to this problem, we can provide a configuration to debug Task JVMs in this scenario.
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