basic streaming question

[motte1988 <wi...@studserv.uni-leipzig.de>]

Hello everybody,
I'm new to spark streaming and played a bit around with WordCount and a
PageRank-Algorithm in a cluster-environment.  
Am I right, that in the cluster each executor computes data stream
separately? And that the result of each executor is independent of the other
executors? 
In the "non-streaming" spark applications each action-operation merges the
data from the executors and compute one result. or is this wrong?
Is it possible in streaming-context to merge several streams like in a
reduce and compute one result?

greetz



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