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https://issues.apache.org/jira/browse/GIRAPH-47?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13124097#comment-13124097
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Claudio Martella commented on GIRAPH-47:
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I've given a thought or two to this interface and I cannot really see an easy
way to pass information to the WorkerContext, a part of the initialize(). For
example, for my particular Emitter scenario, how would i pass at preSuperstep()
or postSuperstep() data to write to the HDFS or in general some parameters that
might be needed?
One way would be to create at Vertex.preApplication() a shared List, where I'd
put the data that the WorkerContext would then dump to disk. It's not the best
way as it could potentially eat a lot of memory.
Or, I could add an emit() method to the implementing class and call it directly
in compute(), like:
((MyEmitterWorkerContext)this.getWorkerContext()).emit(mydata). The engineering
should be able to handle this quite easily (except for the cast cost each time,
which is something).
Any idea?
> Export Worker's Context/State to vertices through
> pre/post/Application/Superstep
> --------------------------------------------------------------------------------
>
> Key: GIRAPH-47
> URL: https://issues.apache.org/jira/browse/GIRAPH-47
> Project: Giraph
> Issue Type: Improvement
> Components: graph
> Affects Versions: 0.70.0
> Reporter: Claudio Martella
> Assignee: Claudio Martella
>
> It would be quite useful for vertices to reach some worker-related
> information stored i.e. in the GraphState class.
> This information could be exported as a parameter to
> pre/post/Application/Superstep like this:
> public void preApplication(Configurable workerObject);
> public void postApplication(Configurable workerObject);
> public void preSuperstep(Configurable workerObject);
> public void postSuperstep(Configurable workerObject);
> public Configurable getWorkerObject();
> Another possibility is to add a Context inner class to BasicVertex to store
> this information.
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