Github user tgravescs commented on the issue:
https://github.com/apache/spark/pull/18388
the idea of the queue is not to queue entire reqeusts, its just to flow
contol the # chunks being sent at once. for example you only create 5 outgoing
chunks at a time per connection, once one of those has been sent you add
another one. This limits the amount of memory being used by those outgoing
chunks. This should not affect closing the connection, at least not change it
from the current behavior.
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