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Posted to mapreduce-issues@hadoop.apache.org by "Ravi Teja Ch N V (Commented) (JIRA)" <ji...@apache.org> on 2011/12/13 07:25:31 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=13168157#comment-13168157 ]
Ravi Teja Ch N V commented on MAPREDUCE-2637:
---------------------------------------------
With IsolationRunner no longer functional(MAPREDUCE-2606),we need to find a alternative for it, as it makes the task debug a bit difficult.
> 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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