[mapred] Change TaskMemoryManager to use JvmIDs instead of TaskIDs for
memory-tracking.
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Key: HADOOP-4219
URL: https://issues.apache.org/jira/browse/HADOOP-4219
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Reporter: Vinod K V
To monitor tasks, TaskMemoryManager uses taskIDs to find pidFiles of the tasks.
HADOOP-249 introduced jvm re-use because of which multiple tasks can run in a
single JVM, and so will share the same pid(pidFile). HADOOP-249 works on a new
task by creating a symlink to the pid-file of the task that ran first in the
same jvm. Also, the process(jvm) is repeatedly added and removed from
monitoring when tasks(under same jvm) come and go. The symlinks and the
repetitive addition/removal from monitoring can be avoided if TaskMemoryManager
uses JvmIDs instead of TaskIDs.
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