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https://issues.apache.org/jira/browse/HADOOP-4523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644088#action_12644088
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Owen O'Malley commented on HADOOP-4523:
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This jira isn't very clear. What are you proposing changing? Is it to make the
mapred.tasktracker.tasks.maxmemory pluggable? If so, I'd propose making an
interface like:
{code}
abstract class MemoryPlugin {
long getVirtualMemorySize(Configuration conf);
}
{code}
and you configure an implementation of it. (mapred.server.memory.plugin ?)
> Enhance how memory-intensive user tasks are handled
> ---------------------------------------------------
>
> Key: HADOOP-4523
> URL: https://issues.apache.org/jira/browse/HADOOP-4523
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Affects Versions: 0.19.0
> Reporter: Vivek Ratan
> Assignee: Vinod K V
>
> 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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