Github user jinxing64 commented on the issue:
https://github.com/apache/spark/pull/16867
@mridulm
Thanks a lot for your comments. I did a test with `TreeSet` previously with
100k tasks. I calculate the time spent on insertion. The results are: 372ms,
362ms, 458ms, 429ms, 363ms, which I think might be acceptable, though the time
complexity is O(log n).
It's great if you can give more advice and I'm glad to try more ideas and
do measurements :)
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