tasanuma commented on PR #6348:
URL: https://github.com/apache/hadoop/pull/6348#issuecomment-1854136818

   Thanks for reporting the issue and submitting the PR, @zhtttylz.
   
   The main fix looks good. But I have concerns about the unit test because 
they pass even without the main fix. Also, I don't think `...Fixed` or 
`...Origin` are good names for methods. Source code changes all the time, so 
method names should reflect what they do.
   
   I think you can create an overflow situation by passing large numbers as 
arguments into the `verifyPendingRecoveryTasks` method. 
`TestDatanodeManager#testPendingRecoveryTasks` might give you some ideas.


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