Hi, I want to groupby hbase data by some columns and again I want to group the resultant data by some columns and check the size of each group if greater than 1 it will be written to hdfs. Initially we are doing this in mapreduce but we got some issue in reducer. So we thought we can move this group by operation to hbase using coprocessor. Hence using this coprocessor we will scan and group data by some columns . Then again I want to group the resultant data how to achieve this in coprocessor?? whether this use case fits in coprocessor??
Thanks On Wed, May 17, 2017 at 1:28 PM, Ted Yu <[email protected]> wrote: > Can you clarify your use case ? > > If your mapper calls Table#coprocessorService(), the recipient may not be > on the same region server as the mapper. > > On Tue, May 16, 2017 at 10:58 PM, Rajeshkumar J < > [email protected] > > wrote: > > > Hi, > > > > whether I can call hase coprocessor in the map function of mapreduce > > job? > > > > Thanks > > >
