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https://issues.apache.org/jira/browse/HADOOP-2765?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Amareshwari Sri Ramadasu updated HADOOP-2765:
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Status: Patch Available (was: Open)
Here is a patch to set memory limits for pipes and streaming tasks.
As suggested by Sameer in offline, I didnt introduce any new config item here.
Now Java tasks are still managed by Xmx limit. Pipes and streaming are set
memory limit with max memory of parent java task. i.e. Pipes and streaming
tasks are started with
ulimit -m Runtime.getRuntime().maxMemory() / 1024
> setting memory limits for tasks
> -------------------------------
>
> Key: HADOOP-2765
> URL: https://issues.apache.org/jira/browse/HADOOP-2765
> Project: Hadoop Core
> Issue Type: New Feature
> Components: contrib/streaming
> Affects Versions: 0.15.3
> Reporter: Joydeep Sen Sarma
> Assignee: Amareshwari Sri Ramadasu
> Attachments: patch-2765.txt
>
>
> here's the motivation:
> we want to put a memory limit on user scripts to prevent runaway scripts from
> bringing down nodes. this setting is much lower than the max. memory that can
> be used (since most likely these tend to be scripting bugs). At the same time
> - for careful users, we want to be able to let them use more memory by
> overriding this limit.
> there's no good way to do this. we can set ulimit in hadoop shell scripts -
> but they are very restrictive. there doesn't seem to be a way to do a
> setrlimit from Java - and setting a ulimit means that supplying a higher Xmx
> limit from the jobconf is useless (the java process will be limited by the
> ulimit setting when the tasktracker was launched).
> what we have ended up doing (and i think this might help others as well) is
> to have a stream.wrapper option. the value of this option is a program
> through which streaming mapper and reducer scripts are execed. in our case,
> this wrapper is small C program to do a setrlimit and then exec of the
> streaming job. the default wrapper puts a reasonable limit on the memory
> usage - but users can easily override this wrapper (eg by invoking it with
> different memory limit argument). we can use the wrapper for other system
> wide resource limits (or any environment settings) as well in future.
> This way - JVMs can stick to mapred.child.opts as the way to control memory
> usage. This setup has saved our ass on many occasions while allowing
> sophisticated users to use high memory limits.
> Can submit patch if this sounds interesting.
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