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https://issues.apache.org/jira/browse/HADOOP-4219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12632673#action_12632673
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Vinod K V commented on HADOOP-4219:
-----------------------------------
Also, as ddas pointed out, TaskMemoryManagerThread class should be renamed to
TaskMemoryManager and TestTaskTrackerMemoryManager should also be renamed to
TestTaskMemoryManager for the sake of consistency.
> [mapred] Change TaskMemoryManager to use JvmIDs instead of TaskIDs for
> memory-tracking.
> ---------------------------------------------------------------------------------------
>
> 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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