[GitHub] [spark] jmzhoulab opened a new pull request #27111: [SPARK-30441][Graphx]Improve the memory usage in StronglyConnectedComponents

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jmzhoulab opened a new pull request #27111: [SPARK-30441][Graphx]Improve the 
memory usage in StronglyConnectedComponents
URL: https://github.com/apache/spark/pull/27111
 
 
   ### What changes were proposed in this pull request?
   Make the Graph/RDD as non-persistent for 'sccGraph' in 'do ... while' and 
'pregel'.
   
   The variable 'sccGraph' has been removed, use the variable 'sccVertexLabel' 
to collect the vertices to be removed in iteration.
   
   ### Why are the changes needed?
   To improve the memory usage, mark the Graph/RDD as non-persistent in the 
iterative process timely.
   figure1: before optimizing memory usage
   
![figure1](https://user-images.githubusercontent.com/43285458/71855828-18511100-311d-11ea-8abc-7adc669a89cb.png)
   
   figure2: after optimizing memory usage
   
![figure2](https://user-images.githubusercontent.com/43285458/71855848-299a1d80-311d-11ea-91a3-ee3a53125921.png)
   
   ### Does this PR introduce any user-facing change?
   no
   
   ### How was this patch tested?
   existing tests

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