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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-695) Add passing of filter state across regions
Date Wed, 08 Dec 2010 00:02:02 GMT

    [ 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:
-------------------------------------

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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