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From Mark question <markq2...@gmail.com>
Subject memory of mappers and reducers
Date Wed, 15 Feb 2012 22:57:18 GMT

  My question is what's the difference between the following two settings:

1. mapred.task.default.maxvmem
2. mapred.child.java.opts

The first one is used by the TT to monitor the memory usage of tasks, while
the second one is the maximum heap space assigned for each task. I want to
limit each task to use upto say 100MB of memory. Can I use only #2 ??

Thank you,

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