steveloughran commented on PR #6938:
URL: https://github.com/apache/hadoop/pull/6938#issuecomment-2326391420

   this is funny: placing the simple PUT in the same thread as close() breaks 
`ITestS3AConcurrentOps`.
   
   Why so? that test looks for at least one thread called s3a-transfer then 
asserts that after the thread timeout that count goes to zero. It is meant to 
assert that after renames the pool is drained but we've made two changes this 
year to reduce the #of threads
   
   1. small file renames don't use copy manager. This invalidated the test -we 
just never noticed
   2. this PR: small PUT doesn't do async. this caused the regression caused by 
change 1 to surfacen
   
   As a result: no threads to assert on.
   
   I'm fixing it by shrinking the size of multipart uploads to their minimum 
-this *seems* to work, though if problems surface in future we should look at 
the test and decide whether or not it is obsolete -or whether we could redesign 
the tests to include more parallelized operations (tree renames?)


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