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From Vladimir Rodionov <vrodio...@carrieriq.com>
Subject RE: Coprocessor
Date Sun, 03 Jun 2012 18:24:28 GMT
I think the combination of a Scanner on a client side  and Coprocessor (RegionObserver) on
HBase side will provide
streaming functionality you need.

Your coprocessor can intercept all scanner operations (preScannerOpen, postScannerOpen, preScannerClose,
postScannerClose, preScannerNext, postScannerNext)
and you can add your logic on these hooks.

Best regards,
Vladimir Rodionov
Principal Platform Engineer
Carrier IQ, www.carrieriq.com
e-mail: vrodionov@carrieriq.com

From: amir [askovron@akamai.com]
Sent: Sunday, June 03, 2012 7:30 AM
To: hbase-dev@hadoop.apache.org
Subject: Coprocessor


I am new to Hbase Coprocessor.
After doing some reading and code inspection its look like there is no way
to stream the coprocessor results to the client during coprocessor run on
the region server.

Am i missing something here?

I may need to process TB in each region server, if the client will have to
wait till start getting results for a coprocessor to end its run, it may be
very inefficient more over the results size may be huge and holding all of
them in the memory either on the region server or in the client may cause
one of them to crush - the result must then be stream base.


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