steveloughran commented on PR #6180:
URL: https://github.com/apache/hadoop/pull/6180#issuecomment-1828731773

   tested: s3 london with ` -Dparallel-tests -DtestsThreadCount=8 -Dscale 
-Dprefetch`
   
   took a while to work out why my connection failure test worked standalone 
and failed in bulk runs, as even after disabling fs instance reuse it still 
occurred.
   
   It was actually prefetching, as this does return connections to the pool!
   Given how "running out of connections by leaking open files" is a recurrent 
issue,
   stabilizing prefetch and switching to it by default will be good.
   But: we may need even more http connections!
   
   @ahmarsuhail can you look at this?
   
   The core change is straightforward:
   * let users configure the v2 sdk client timeouts and options for http and 
async clients.
   * allow them to use the suffix times so as to eliminate all confusion about 
setting unit
   


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