Github user Koraseg commented on the issue:
https://github.com/apache/spark/pull/22894
I have also updated benchmarks here:
https://github.com/Koraseg/mapstatus-benchmark.
By the way, the best performance has shown
gnu.trove.map.hash.TIntByteHashMap. But the boost in comparison with
java.util.HashMap seems not too big for a new library dependency.
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