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From "Lukas Nalezenec (JIRA)" <>
Subject [jira] [Commented] (GIRAPH-1000) Multi Output support
Date Wed, 25 Mar 2015 10:09:53 GMT


Lukas Nalezenec commented on GIRAPH-1000:

Its already possible to write multiple outputs in Giraph using WorkerContext. 
Its not ideal - you have to care of failed tasks manually but it works.

See file in project giraph-examples.

> Multi Output support
> --------------------
>                 Key: GIRAPH-1000
>                 URL:
>             Project: Giraph
>          Issue Type: Improvement
>          Components: bsp, conf and scripts, graph
>    Affects Versions: 1.0.0, 1.1.0, 1.2.0-SNAPSHOT
>            Reporter: Alessio Arleo
>              Labels: features
> Hadoop natively supports multiple outputs. The objective is to extend Giraph to support
multiple output formats during a single giraph run.
> According to the official Hadoop apidocs*, to take advantage of multiple outputs the
 the pattern is the following:
> - Modify the job submission
> - Modify the reducer class to write on the declared different outputs
> Since Giraph jobs are executed as mappers, probably this approach (or at least its second
part) is not feasible, so further investigation is necessary.
> *

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