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
