Takeshi Yamamuro created SPARK-4725:
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Summary: Re-think custom shuffle serializers for vertex messages
Key: SPARK-4725
URL: https://issues.apache.org/jira/browse/SPARK-4725
Project: Spark
Issue Type: Improvement
Components: GraphX
Reporter: Takeshi Yamamuro
Priority: Minor
These serializers are removed in Spark-3649 because some type mismatch
errors occur in SortShuffleWriter.
https://www.mail-archive.com/commits@spark.apache.org/msg04125.html
However, messages between executors might be of critical performance issues in
PageRank and other communication-intensive graph tasks.
Ankur reported that the removal caused a slowdown and the increase
of per-iteration communications in the commit log.
I made a patch to avoid the type-mismatch error in
https://github.com/maropu/spark/commit/20e74f0e41ed99cb0a89ec5e5fc0e3c9e3f1038e#diff-68f4d319d5a58cbe0729476e0cb8594aR39
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