Thank you guys for the valuable inputs.
Regards,
Mohammad Tariq
On Thu, Jun 28, 2012 at 10:27 AM, Lars George wrote:
> Yes exactly, this plus what Mohammad says, use the internal scanner to get
> just the data from the region once you are in the coprocessor code. There is
> an example of
Yes exactly, this plus what Mohammad says, use the internal scanner to get just
the data from the region once you are in the coprocessor code. There is an
example of that in the book as well, here the online repo:
https://github.com/larsgeorge/hbase-book/blob/master/ch04/src/main/java/coprocesso
HTable api document shows:
Map coprocessorExec(
Class protocol, byte[] startKey, byte[] endKey, Batch.Call
callable)
throws IOException, Throwable;
startKey && endKey bounds the region of your interest.
On Thu, Jun 28, 2012 at 5:43 AM, Mohammad Tariq wrote:
> Aman, Lars,
>
>
Would it be useful to use InternalScanner in such a scenario??
Regards,
Mohammad Tariq
On Thu, Jun 28, 2012 at 3:13 AM, Mohammad Tariq wrote:
> Aman, Lars,
>
> If I already know in advance that a particular region
> holds the data of my interest, then how can I use Coprocessor
Aman, Lars,
If I already know in advance that a particular region
holds the data of my interest, then how can I use Coprocessor to
operate on that region only and not on all the regions of a particular
table??Thank you.
Regards,
Mohammad Tariq
On Wed, Jun 27, 2012 at 11:57 PM,
Hi Mohammad,
Not sure I follow. :(
Coprocessor is not MapReduce. MapReduce already takes care to run your code
local to the data.
Coprocessors can be seen like lightweight Map-only MapReduce job.
You need to share a few more details for us to be able to help.
Thanks,
Lars
On Jun 26, 2012, a
Mohammad,
Can you describe what you are trying to do a little more? Is this a
endpoint coprocessor you are trying to build? What is the functionality
it'll provide?
-Amandeep
On Tue, Jun 26, 2012 at 12:44 PM, Mohammad Tariq wrote:
> Hello Lars,
>
>Thank you so much for the quick respon
Hello Lars,
Thank you so much for the quick response.Actually, I want to
run my MapReduce jobs on a region that contains a specific set of
data.
Regards,
Mohammad Tariq
On Tue, Jun 26, 2012 at 9:18 PM, Lars George wrote:
> Hi Mohammad,
>
> The code runs on the server which is openi
Hi Mohammad,
The code runs on the server which is opening the region. It sounds to me that
this is not what you want and that you need to have access to some sort of
resources only available on one specific server? Because if that is not the
case, then you are simply using the coprocessors the
Hello list,
Is it possible to use Coprocessors on some specific
regionservers instead of a per-region basis??As per my understanding a
coprocessor allows us to run the code directly on each region
server.Please correct me if I am wrong.Many thanks.
Please correct me if I am wrong.
Regard
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