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From Claudio Martella <claudio.marte...@gmail.com>
Subject Re: Is it possible to know the mapper task a particular vertex is assigned to?
Date Thu, 06 Mar 2014 09:19:49 GMT
by default vertices stay where they are when they are loaded.


On Thu, Mar 6, 2014 at 7:31 AM, Pankaj Malhotra <pankajiitdyn@gmail.com>wrote:

> There is a vertex with a large outgoing edge-list. I wanted to compare the
> memory usage, number of messages, and few other statistics for the worker
> with this vertex and the average statistics across workers.
>
> Does the mapping change within the same job?
>
> Thanks,
> Pankaj
>
>
> On 6 March 2014 11:38, Roman Shaposhnik <shaposhnik@gmail.com> wrote:
>
>> On Wed, Mar 5, 2014 at 9:53 PM, Pankaj Malhotra <pankajiitdyn@gmail.com>
>> wrote:
>> > Hi,
>> >
>> > How can I find the mapper task a particular vertex is assigned to?
>> > I can do this by doing a sysout and then looking at the logs. But there
>> must
>> > be a smarter way to do this. Please suggest.
>>
>> That mapping is not static and can change. In theory you can rely on
>> the info in ZK, but that would be relying on what is, essentially, an
>> implementation detail of Giraph.
>>
>> What's the reason for you to need this info?
>>
>> Thanks,
>> Roman.
>>
>
>


-- 
   Claudio Martella

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