Claudio Martella commented on GIRAPH-47:

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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