Duo Zhang created HBASE-22108:
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             Summary: Avoid passing null in Admin methods
                 Key: HBASE-22108
                 URL: https://issues.apache.org/jira/browse/HBASE-22108
             Project: HBase
          Issue Type: Task
            Reporter: Duo Zhang


For some methods we must pass null if we want specific behaviors, for example, 
move region to a random server, split region without providing an explicit 
split point, etc.

We should provide methods without some parameters so user do not need to pass 
null.

So in the future users do not need to guess whether a method accept null 
parameters, the answer is always no.



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