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https://issues.apache.org/jira/browse/HBASE-695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12969081#action_12969081
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Jonathan Gray commented on HBASE-695:
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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).
> Add passing of filter state across regions
> ------------------------------------------
>
> Key: HBASE-695
> URL: https://issues.apache.org/jira/browse/HBASE-695
> Project: 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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