[jira] [Commented] (GIRAPH-1000) Multi Output support

["Lukas Nalezenec (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GIRAPH-1000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14379631#comment-14379631 ] 

Lukas Nalezenec commented on GIRAPH-1000:
-----------------------------------------

FYI: 
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 SimpleVertexWithWorkerContext.java in project giraph-examples.

> Multi Output support
> --------------------
>
>                 Key: GIRAPH-1000
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-1000
>             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.
> *https://hadoop.apache.org/docs/r1.2.1/api/org/apache/hadoop/mapreduce/lib/output/MultipleOutputs.html



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