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https://issues.apache.org/jira/browse/GIRAPH-314?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eli Reisman updated GIRAPH-314:
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Attachment: GIRAPH-314-2.patch
This patch represents a blatant tradeoff of compute time for space (in the form
of memory, networking resources/buffers etc.)
It adds a user-configurable option that allows you to amortize the overwhelming
load of degree(V)^2 messages in a triangle closing operation over as many super
steps as you can stomach, which in practice has turned out to be surprisingly
effective, and still reasonably quick given there is little work for most
vertices to do in such super steps when only 1/N of them on any given superstep
will do any sending, and many will similarly not receive anything.
This has been tested on the cluster (even under surprisingly high load) and
passes mvn verify etc.
It will be part of a 2-pronged strategy to get triangle closing to work at a
useful scale, the other half of which will be posted in a separate JIRA. But
this part is good to go.
> Implement better message grouping to improve performance in
> SimpleTriangleClosingVertex
> ---------------------------------------------------------------------------------------
>
> Key: GIRAPH-314
> URL: https://issues.apache.org/jira/browse/GIRAPH-314
> Project: Giraph
> Issue Type: Improvement
> Components: examples
> Affects Versions: 0.2.0
> Reporter: Eli Reisman
> Assignee: Eli Reisman
> Priority: Trivial
> Fix For: 0.2.0
>
> Attachments: GIRAPH-314-1.patch, GIRAPH-314-2.patch
>
>
> After running SimpleTriangleClosingVertex at scale I'm thinking the
> sendMessageToAllEdges() is pretty in the code, but its not a good idea in
> practice since each vertex V sends degree(V)^2 messages right in the first
> superset in this algorithm. Could do something with a combiner etc. but just
> grouping messages by hand at the application level by using
> IntArrayListWritable again does the trick fine.
> Probably should have just done it this way before, but
> sendMessageToAllEdges() looked so nice. Sigh. Changed unit tests to reflect
> this new approach, passes mvn verify and cluster, etc.
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