Github user zsxwing commented on the issue:
https://github.com/apache/spark/pull/18388
> there are 200K+ connections and 3.5M blocks(FileSegmentManagedBuffer)
being fetched.
Did you use a large `spark.shuffle.io.numConnectionsPerPeer`? If not, the
number of connections seems too large since each ShuffleClient should have only
one connection to one shuffle service. How large is your cluster and how many
applications are running at the same time?
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