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Procedure to write vertex values in an output file in Giraph

Debajyoti Kundu
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I am trying to figure out how the vertex values are written to part-m-00000 output file in Giraph.

In case of MapReduce, inside reducer we use:: context.write(key, this.result); to write that particular key value pair in the part-r-00000 output file. Is there any similar logic in Giraph to write vertex value in an output file?

I could not find any statement suggesting such action in Giraph source code, also I did not find anything in internet about it.

Any help is appreciated.
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