1458451310 opened a new pull request, #6155:
URL: https://github.com/apache/hbase/pull/6155

   Recently, I have been managing the large tables in the HBase cluster by 
enabling the normalizer to set the size of the regions and keep the number of 
regions within a reasonable range.
   The current code retrieves tables from RegionNormalizerWorkQueue and 
performs normalization operations on the tables in series. When there are 
multiple large tables in a cluster that need to be managed, the efficiency will 
be very low.
   I have confirmed that each split or merge plan generated by each table 
during the normalizer process will be limited by RateLimiter, so I think it is 
reasonable to perform table normalizers concurrently.
   In terms of implementation, create a thread pool for executing tasks in 
RegionNormalizerWorker, with a default value of 1 for the number of thread 
pools, and provide a parameter that can be configured to other values.


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