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HBase >> mail # user >> Hbase MapReduce


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Dalia Sobhy 2012-11-24, 17:15
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Marcos Ortiz 2012-11-24, 17:32
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tom 2012-11-24, 17:46
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Re: Hbase MapReduce
Do you think it would be a good idea to temper the use of CoProcessors?

This kind of reminds me of when people first started using stored procedures...
Sent from a remote device. Please excuse any typos...

Mike Segel

On Nov 24, 2012, at 11:46 AM, tom <[EMAIL PROTECTED]> wrote:

> Hi, but you do not need to us M/R. You could also use coprocessors.
>
> See this site:
> https://blogs.apache.org/hbase/entry/coprocessor_introduction
> -> in the section "Endpoints"
>
> An aggregation coprocessor ships with hbase that should match your requirements.
> You just need to load it and eventually you can access it from HTable:
>
> HTable.coprocessorExec(..) <http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/HTable.html#coprocessorExec%28java.lang.Class,%20byte[],%20byte[],%20org.apache.hadoop.hbase.client.coprocessor.Batch.Call,%20org.apache.hadoop.hbase.client.coprocessor.Batch.Callback%29>
>
> Regards
> tom
>
> Am 24.11.2012 18:32, schrieb Marcos Ortiz:
>> Regards, Dalia.
>> You have to use MapReduce for that.
>> In the HBase in Practice´s book, there are lot of great examples for this.
>>
>> On 11/24/2012 12:15 PM, Dalia Sobhy wrote:
>>> Dear all,
>>> I wanted to ask a question..
>>> Do Hbase Aggregate Functions such as rowcount, getMax, get Average use MapReduce to execute those functions?
>>> Thanks :D
>
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Dalia Sobhy 2012-11-24, 18:32
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Wei Tan 2012-11-25, 06:26
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Adrian Acosta Mitjans 2013-04-20, 16:12