Github user a-roberts commented on the issue:
https://github.com/apache/spark/pull/15713
I'll add a print to keep track of how big the CompactBuffer actually gets
when used with, say, SparkSqlPerf (1 scale factor then 2 scale factor) and
HiBench.
Once this is complete and we have an idea of how big it gets for these
workloads, I'll be running the unit tests with an ArrayBuffer(2) replacing all
CompactBuffer instances, I have the code ready and hoping to soon finish up the
Partitioned* class PR to speed up the PageRank implementation and to contribute
the first phase of improvements to the SizeEstimator.
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