[jira] [Created] (HBASE-16668) Admin class should have a synchronous Admin#mergeRegions* method

["Jonathan Hsieh (JIRA)" <ji...@apache.org>]

Jonathan Hsieh created HBASE-16668:
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             Summary: Admin class should have a synchronous Admin#mergeRegions* method 
                 Key: HBASE-16668
                 URL: https://issues.apache.org/jira/browse/HBASE-16668
             Project: HBase
          Issue Type: Bug
          Components: hbase
    Affects Versions: 2.0.0
            Reporter: Jonathan Hsieh
             Fix For: 2.0.0


In trunk from HBASE-14552, we have deprecated {{void Admin#mergeRegions}} (in 1.x this was an asynchronous call) and replaced it with {{Future<Void> Admin#mergeRegionsAsync}} which is clearly async.    

This leaves us only with the async version.

We should have an easy way to make {{mergeRegions}} or an equivalant behave synchronously.  

For normal java Futures, we could just call the future's {{get()}} method. Unforutnately, the future this method returns doesn't follow java Future convention and throws Unimplemented operation when a  plain {{get()}} is called and makes the api harder to use and read.  We could make this future act more normally, and have the timeout throw an InterruptedException.

Alternately, we could expose a new method in {{Admin}} that behaves synchronously such as {{HBaseAdmin#mergeRegionsSync}}. The caveat here is that we shouldn't use the name {{#mergeRegions}} since it exists in 1.x with async semantics. 






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