jcongithub commented on PR #7519:
URL: https://github.com/apache/hbase/pull/7519#issuecomment-3679474667

   @guluo2016 
   It seems difficult to add a clean unit test for this scenario. I explored 
options to simulate a slow region move using SingleProcessHBaseCluster, but 
there doesn’t appear to be a straightforward way to “hook” into the cluster and 
delay the region movement without making significant structural changes.
   
   I also looked into mocking MoveWithAck to force a delay/timeout, but I 
haven’t found a reliable approach there either.
   
   If you know of an existing mechanism or have suggestions on how to simulate 
a slow region move in the current test framework, I’m happy to add a unit test. 
Otherwise, adding one may require non-trivial changes to the testing 
infrastructure.


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