Github user jinxing64 commented on the issue:
https://github.com/apache/spark/pull/18388
Analyzing the heap dump, there are 200K+ connections and 3.5M
blocks(`FileSegmentManagedBuffer`) being fetched. Yes, flow control is a good
idea. But I still think it make much sense to control the concurrency. Reject
some "open blocks" requests, thus we can have sufficient bandwidth for the
existing connections and we can finish the reduce task as soon as possible.
Simple flow control(slow down connections when pressure) can help avoid OOM,
but it seems more reduce tasks will run longer.
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