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HDFS >> mail # user >> Re: How is the memory usage of containers controlled?


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Yuzhang Han 2013-06-21, 20:30
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Re: How is the memory usage of containers controlled?
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Arun

On Jun 21, 2013, at 1:30 PM, Yuzhang Han <[EMAIL PROTECTED]> wrote:

> Thank you Arun.
>
> I am trying to study how YARN works. Can someone tell me which class(es) monitors containers w.r.t. memory usage?
>
>
> On 6/18/2013 4:07 PM, Arun C Murthy wrote:
>> NodeManagers monitor containers w.r.t memory usage, and put containers in cgroups with cpu limits to restrict CPU usage.
>>
>> On Jun 18, 2013, at 12:30 PM, Yuzhang Han <[EMAIL PROTECTED]> wrote:
>>
>>> Hi,
>>> I am curious about how YARN containers control their memory usage. Say, I have a MR job, and I configure that every map task should be assigned a 1 GB container, and every reduce task a 1.5 GB one. So, when YARN runs the containers, how is it ensured that all map containers use less than 1 GB memory and all reduce containers less than 1.5 GB? Is container memory control realized via -Xmx arguments in the scripts generated by YARN to invoke the MR program in the containers?
>>>
>>> Thank you.
>>
>> --
>> Arun C. Murthy
>> Hortonworks Inc.
>> http://hortonworks.com/
>>
>>
>

--
Arun C. Murthy
Hortonworks Inc.
http://hortonworks.com/
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Yuzhang Han 2013-06-24, 03:27