Jonathan Lawlor created HBASE-13597:
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Summary: Add ability for Filters to force response back to client
during scans
Key: HBASE-13597
URL: https://issues.apache.org/jira/browse/HBASE-13597
Project: HBase
Issue Type: New Feature
Reporter: Jonathan Lawlor
Currently, the only way for a filter to force a response back to the client
during the execution of a scan is via the use of filter#filterAllRemaining().
When this method call returns true, the region server interprets it as meaning
that all remaining rows should be filtered out. This also signals to the client
that the scanner should close (it's finished...).
It would be nice if there was a mechanism that allowed the filter to force a
response back to the client without actually terminating the scan. The client
would receive the response from the server and could continue the scan from
where it left off.
I would imagine that such a feature would be used primarily in instances where
real-time behavior was a concern. In a sense it would allow filters to
implement their own restrictions on the client-server scan protocol. I think
this feature can now be supported since we started to send back the
moreResultsOnServer flag in the ScanResponse (HBASE-13262) to tell the client
that the current region is not exhausted.
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