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From Kai Voigt...@123.org>
Subject Re: Relationship between heap sizes and mapred.child.java.opt configuration
Date Mon, 25 Nov 2013 15:02:04 GMT
mapred.child.java.opts are referring to the settings for the JVMs spawned by the TaskTracker.
This JVMs will actually run the tasks (mappers and reducers)

The heap sizes for TaskTrackers and DataNodes are unrelated to those. They run in their own
JVMs each.

Kai

Am 25.11.2013 um 15:52 schrieb Chih-Hsien Wu <chjasonwu@gmail.com>:

> I'm learning about Hadoop configuration. What is the connection between the datanode/
tasktracker heap sizes and the "mapre.child.java.opts"?  Does one have to be exceeded to another?


Kai Voigt			Am Germaniahafen 1			k@123.org
					24143 Kiel						+49 160 96683050
					Germany						@KaiVoigt


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