ZanderXu opened a new pull request, #4360:
URL: https://github.com/apache/hadoop/pull/4360

   In our production environment, when DN needs to delete a large number 
blocks, we find that many deletion tasks are backlogged in the queue of 
threadPoolExecutor in FsDatasetAsyncDiskService. We can't improve its 
throughput because the number of core threads is hard coded.
   
   So DN needs to support the number of core threads of 
FsDatasetAsyncDiskService can be configured.


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