ahmarsuhail opened a new pull request, #4294:
URL: https://github.com/apache/hadoop/pull/4294

   ### Description of PR
   
   If close the prefetching input stream before prefetched blocks have finished 
reading the S3 input stream, the sdk repeatedly complains "Not all bytes were 
read from the S3ObjectInputStream". This happened on `S3AInputStream` as well, 
see [this](https://github.com/aws/aws-sdk-java/issues/1211) issue for more 
details.
   
    Closing the stream before draining it will abort the connection, so to 
allow for connection reuse we drain it asynchronously. 
   
   ### How was this patch tested?
   
   Tested in eu-west-1 by running
   
   `mvn -Dparallel-tests -DtestsThreadCount=16 clean verify`
   


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