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From André Kelpe <>
Subject Re: Does Giraph supports multi threaded MapJobs
Date Wed, 23 May 2012 13:20:27 GMT
Hi Zuhair,

giraph will spawn multiple mappers depending on how many you
configure. If you look into the ShortestPathExample
you will see this piece of code, which controls the number of workers:


It is also quite useful to read through the constants in the GiraphJob class.



2012/5/23 Zuhair Khayyat <>:
> Dear Giraph Community,
> Since Giraph is a single Mapper job; does it support multi threaded Map Jobs
> handlers? In other words, can a Giraph worker be a multi threaded worker? If
> I am implementing my own aggregator, do I have to consider thread safe
> operations?
> Thank you,
> Zuhair Khayyat

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