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HBase >> mail # user >> passing a parameter to an observer coprocessor


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RE: passing a parameter to an observer coprocessor
We would like to avoid such interruption. A global hashmap storing such a
setting would be more desirable.
Thanks,
Wei

---------------------------------
Wei Tan, PhD
Research Staff Member
IBM T. J. Watson Research Center
http://researcher.ibm.com/person/us-wtan

From:   Vladimir Rodionov <[EMAIL PROTECTED]>
To:     "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>,
Cc:     "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
Date:   08/22/2013 05:19 PM
Subject:        RE: passing a parameter to an observer coprocessor

This is not so flexible and dynamic. Changing table level attributes
will require disabling/enabling table (20-30 seconds for large tables)
Is OK with your use case?

Best regards,
Vladimir Rodionov
Principal Platform Engineer
Carrier IQ, www.carrieriq.com
e-mail: [EMAIL PROTECTED]

________________________________________
From: Wei Tan [[EMAIL PROTECTED]]
Sent: Thursday, August 22, 2013 1:32 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: Re: passing a parameter to an observer coprocessor

Hi Anoop and Vladimir,

   Thanks for your reply. I think adding an attribute to each Mutation is
not the flexibility level we want -- also we do not want that level of
overhead. Having a singleton class acting as a global variable for a
table, using endpoint to set and letting observer to read, is more
desirable.

Wei
From:   Anoop John <[EMAIL PROTECTED]>
To:     [EMAIL PROTECTED],
Cc:     "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
Date:   08/22/2013 03:03 PM
Subject:        Re: passing a parameter to an observer coprocessor

This will need you have to pass the attr with every Mutation. If this
level
of dynamic nature you dont want, then as Andy said can impl Observer and
Endpoint and some Singleton object which both can share..

-Anoop-

On Fri, Aug 23, 2013 at 12:18 AM, Anoop John <[EMAIL PROTECTED]>
wrote:

> Can use Mutation#setAttribute(String name, byte[] value)  ?    Based on
> this attr value can decide in CP which flow it should go with?
>
> -Anoop-
>
>  On Thu, Aug 22, 2013 at 11:33 PM, Vladimir Rodionov <
> [EMAIL PROTECTED]> wrote:
>
>> Sorry, CF must not be fake, I suppose (because its region coprocessor)
>>
>> put.add(REAL_COLUMN_FAMILY, "flag".getBytes(),"true".getBytes());
>>
>> 'flag' is the fake column. You have to process these columns in your
>> Coprocessor and extract them.
>>
>> Best regards,
>> Vladimir Rodionov
>> Principal Platform Engineer
>> Carrier IQ, www.carrieriq.com
>> e-mail: [EMAIL PROTECTED]
>>
>> ________________________________________
>> From: Vladimir Rodionov
>> Sent: Thursday, August 22, 2013 10:53 AM
>> To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
>> Subject: RE: passing a parameter to an observer coprocessor
>>
>> Add fake cf + column to your Put operation
>>
>> Put put = new Put(row);
>>
>> put.addFamily("COMMAND".getBytes(),
"flag".getBytes(),"true".getBytes());
>>
>> Best regards,
>> Vladimir Rodionov
>> Principal Platform Engineer
>> Carrier IQ, www.carrieriq.com
>> e-mail: [EMAIL PROTECTED]
>>
>> ________________________________________
>> From: Wei Tan [[EMAIL PROTECTED]]
>> Sent: Thursday, August 22, 2013 9:36 AM
>> To: [EMAIL PROTECTED]
>> Subject: passing a parameter to an observer coprocessor
>>
>> Hi all,
>>
>>    I want to add some dynamic behavior to my observer cp, say:
>>
>> postPut(){
>>
>> if(flag) {do function1()};
>> else {do function2()}
>>
>> }
>>
>>   Is there a way to dynamically change the value of flag? One Feasible
>> approaches is to change a value in table descriptor, but then I need to
>> restart the table. Is there a way to pass a parameter using an API,
say,
>> from an endpoint, to an observer? Another way to ask this question is,
is
>> there a shared variable between an observer, and an endpoint, in a
common
>> table?
>>
>> Thanks,
>> Wei
>>
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB