Thomas Jungblut created HAMA-737:
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Summary: 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
Fix For: 0.6.1, 0.7.0
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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