Details
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Type:
New Feature
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Status: Resolved
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Priority:
Major
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Resolution: Not A Problem
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Affects Version/s: None
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Fix Version/s: None
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Component/s: None
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Labels:None
Description
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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Why would we never allow filter state across regions? Makes sense in MR context where all regions running in parallel, but could use cases of single-threaded client wanting a stateful filter?
Don't think this is a high priority but does seem legitimate (simple row paging, for example, cannot be done correctly without it).
We'll never allow this happen, not if we want to be scalable.