Add passing of filter state across regions
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                 Key: HBASE-695
                 URL: https://issues.apache.org/jira/browse/HBASE-695
             Project: Hadoop HBase
          Issue Type: New Feature
            Reporter: stack


Discussion on list arrived at need for filters to carry cross-region state.  
For example, if you are looking for sufficient rows to fill the fifth page of a 
set of results and a particular region only has the first half of page 5, there 
needs to be a mechanism to tell the next region in line, how far the scan has 
gotten.  Clint Morgan suggested some kind of RPC or callback that the 
serverside region could tug on to pass back to the client the state-laden 
filter for passing the next region.

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