Providing options to debug the mapreduce user code (Mapper, Reducer, Combiner,
Sort implementations)
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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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