steveloughran commented on pull request #2303:
URL: https://github.com/apache/hadoop/pull/2303#issuecomment-693406274


   Test with -
   mvit -Dparallel-tests -DtestsThreadCount=6 -Dmarkers=keep -Ds3guard -Ddynamo 
 -Dfs.s3a.directory.marker.audit=true -Dscale
   
   https://issues.apache.org/jira/browse/HADOOP-17263 : read() didn't get as 
much back as expected (unrelated)
   https://issues.apache.org/jira/browse/HADOOP-17226 Failure of 
ITestAssumeRole.testRestrictedCommitActions
   
   That -Dscale option kicks off some MR jobs which spawn extra processes 
beyond the maven JUnit runners, the system may be overloading. Surprised how it 
surfaces though. I can see it amplifies a race condition in a non-atomic ++ 
call (more chance of pre-emption, longer delay for rescheduling), but read() 
not receiving enough data


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