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https://issues.apache.org/jira/browse/HAMA-737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Jungblut resolved HAMA-737.
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Resolution: Fixed
committed, thanks for review Edward.
> Add graph output writer
> -----------------------
>
> Key: HAMA-737
> URL: https://issues.apache.org/jira/browse/HAMA-737
> Project: Hama
> Issue Type: New Feature
> Components: graph
> Affects Versions: 0.6.0
> Reporter: Thomas Jungblut
> Assignee: Thomas Jungblut
> Fix For: 0.6.1, 0.7.0
>
> Attachments: HAMA-737_1.patch
>
>
> Currently only VertexID\tVertexValue can be written to the output.
> If someone want to write anything else (e.G. the edge values) he can not.
> Analogously to the VertexInputReader, it would be nice to have a
> VertexOutputWriter.
> It should have the following abilities:
> - setup (Configuration)
> - write(Vertex<>, Peer)
> The current state would be mimicked by a DefaultVertexOutputWriter that
> writes the vertex key and value to the peer.
> The current writing happens in cleanup of the GraphJobRunner.
> Following things must be added:
> - A reflection based instantiation process that reads a class from
> Configuration and makes it available through the VertexOutputWriter interface
> in the GraphJobRunner.
> - cleanup must be calling the #write method for each vertex
> - GraphJob should have another method called setVertexOutputWriterClass(class)
> - GraphJob must ensure in submit override that the DefaultVertexOutputWriter
> is set if nothing was configured yet.
> Usecase:
> Actually every algorithm that changes edge values and use it for further post
> processing. Also algorithms that need to hold state in the vertex that is not
> the value, currently this can only be solved by a multiple valued Writable
> Vertex value. (Bipartite Matching could be simplified in that regard).
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