jiamuzhou created SPARK-30441:
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Summary: Improve the memory usage in StronglyConnectedComponents
Key: SPARK-30441
URL: https://issues.apache.org/jira/browse/SPARK-30441
Project: Spark
Issue Type: Improvement
Components: GraphX
Affects Versions: 2.4.4
Reporter: jiamuzhou
Fix For: 2.4.5, 3.0.0, 3.1.0
Attachments: figure1.png, figure2.png
This is very consume memory when It use StronglyConnectedComponents(see
figure1.png). Because there is no mark the Graph/RDD as non-persistent in the
iterative process timely. And it is maybe lead to fail in the big graph.
In order to improve the memory usage, it is verty important to mark the
Graph/RDD as non-persistent timely. In the current code, only make the
Graph/RDD as non-persistent for 'sccGraph' but not for 'sccWorkGraph' in
degree's step and pregel's step.
I have done a optimized code proposal(see my
fork:[https://github.com/jmzhoulab/spark/blob/branch-2.4/graphx/src/main/scala/org/apache/spark/graphx/lib/StronglyConnectedComponents.scala])
The storage after optimization see figure1.png
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