Ngone51 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-602501688
 
 
   >  >Currently we just run and timeout 3 times, and this PR proposes to fail 
fast.
   >
   > We should not be failing without retrying. Is that really what this does? 
I'd have to take a closer look but I thought the RetryingBlockFetcher caught 
this and did its normal retries within it, but that was my question yesterday 
to confirm?
   
   @cloud-fan @tgravescs  IIUC, this PR only fail fast in a single one 
connection try but will still retry if it's a `RetryingBlockFetcher`.

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