clarax opened a new pull request #3723:
URL: https://github.com/apache/hbase/pull/3723


   …f list
   
   There is a reason for the bias of the server pick. LoadCandidate generator 
always pick the first server of the same region count. For large cluster, it 
often gets stuck and also causes drifting. This fix will use reservoir sampling 
(http://gregable.com/2007/10/reservoir-sampling.html) to randomize the pick.


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