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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4223) Support the ability to return a set of rows using Coprocessors
Date Thu, 18 Aug 2011 16:16:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13087091#comment-13087091

Andrew Purtell commented on HBASE-4223:

Another option could be to spill the result into a temporary file in the region and then allow
clients to scan over them using the normal scanner interface, setting some attribute on the
Scan object to indicate what you want? There wouldn't be a result set size limitation in this

> Support the ability to return a set of rows using Coprocessors
> --------------------------------------------------------------
>                 Key: HBASE-4223
>                 URL: https://issues.apache.org/jira/browse/HBASE-4223
>             Project: HBase
>          Issue Type: Improvement
>          Components: coprocessors
>    Affects Versions: 0.92.0
>            Reporter: Nichole Treadway
>            Priority: Minor
>         Attachments: HBASE-4223.patch
> Currently HBase supports returning the results of aggregation operations using coprocessors
with the AggregationClient. It would be useful to include a client and implementation which
would return a set of rows which match a certain criteria using coprocessors as well. We have
a use case in our business process for this. 
> We have an initial implementation of this, which I've attached. The only limitation that
we've found is that it cannot be used to return very large sets of rows. If the result set
is very large, it would probably require some sort of pagination.

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