Thanks Yu. My understanding is, this coprocessor is available as part of Hbase
server components. So I should be able to attach this coprocessor to any of my
tables by using alter table command.
alter 'demo-table','COPROCESSOR' =>'<XXXX.jar>|class|priority|args'
Then from hbase shell, I should be able to call this coprocessor with command.
Same like how we do scan and filter. Is there any command like below(filter
command) calling a coprocessor. So that it will run in region server and return
back results?.
scan 'demo-table', {FILTER =>
org.apache.hadoop.hbase.filter.RowFilter.new(CompareFilter::CompareOp.valueOf('EQUAL'),SubstringComparator.new("10001|1395309600"))}
I am trying to figure out a simple call mechanism(client) of coprocessor. If by
default those classes and calling mechanism not available from hbase shell.
Then planning to use java client code to invoke coprocessor.
Any pointers to java client to invoke
aggregation<http://search-hadoop.com/c/HBase:hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/AggregateImplementation.java||Hbase+aggregation+endpoint>
coprocessor will be helpful.
Thanks,
Chandra
-----Original Message-----
From: Ted Yu [mailto:[email protected]]
Sent: Friday, April 11, 2014 10:42 PM
To: [email protected]
Subject: Re: endpoint coprocessor
Please take a look at :
hbase-shell/src/main/ruby/hbase/security.rb
for example on how coprocessor is activated from shell.
Cheers
On Fri, Apr 11, 2014 at 11:06 AM, Bogala, Chandra Reddy <
[email protected]<mailto:[email protected]>> wrote:
> Thank you. I am aware of this challenge. How to call below coprocessor
> from client. Can I call this coprocessor from hbase shell?. I am new
> to Hbase. So may be asking very dumb questions.
>
> Thanks,
> Chandra
>
> -----Original Message-----
> From: Asaf Mesika [mailto:[email protected]]
> Sent: Friday, April 11, 2014 12:10 PM
> To: [email protected]<mailto:[email protected]>
> Subject: Re: endpoint coprocessor
>
> Bear in mind each region will return its top n, then you will have to
> run another top n in your client code. This introduce a numerical
> error : top on top.
>
> On Thursday, April 10, 2014, Bogala, Chandra Reddy
> <[email protected]<mailto:[email protected]>>
> wrote:
>
> > Hi,
> > I am planning to write endpoint coprocessor to calculate TOP N
> > results for my usecase. I got confused with old apis and new apis.
> > I followed below links and try to implement. But looks like api's
> > changed a lot. I don't see many of these classes in hbase jars. We
> > are using Hbase 0.96.
> > Can anyone point to the latest document/apis?. And if possible
> > sample code to calculate top N.
> >
> > https://blogs.apache.org/hbase/entry/coprocessor_introduction
> > HBase Coprocessors - Deploy shared functionality directly on the
> > cluster<https://www.youtube.com/watch?v=xHvJhuGGOKc>
> >
> > Thanks,
> > Chandra
> >
> >
> >
>
