Enhance how memory-intensive user tasks are handled
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Key: HADOOP-4523
URL: https://issues.apache.org/jira/browse/HADOOP-4523
Project: Hadoop Core
Issue Type: Improvement
Reporter: Vivek Ratan
HADOOP-3581 monitors each Hadoop task to see if its memory usage (which
includes usage of any tasks spawned by it and so on) is within a per-task
limit. If the task's memory usage goes over its limit, the task is killed.
This, by itself, is not enough to prevent badly behaving jobs from bringing
down nodes. What is also needed is the ability to make sure that the sum total
of VM usage of all Hadoop tasks does not exceed a certain limit.
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