cloud-fan commented on issue #27943: [SPARK-31179] Fast fail the connection 
while last connection failed in the last retry IO wait
URL: https://github.com/apache/spark/pull/27943#issuecomment-601095546
 
 
   I think the problem can be described as: the client pool has no more healthy 
clients, and we need to run a task, what shall we do?
   
   Currently we just run and timeout 3 times, and this PR proposes to fail fast.

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