This question was answered here already: http://mail-archives.apache.org/mod_mbox/hbase-user/201101.mbox/%[email protected]%3E
Counters are not idempotent, this can be hard to manage. J-D On Mon, Jun 18, 2012 at 5:49 PM, Sid Kumar <[email protected]> wrote: > Hi everyone, > > I have a use case in HBase that I was wondering if someone may have > stumbled upon. I am maintaining an ad impressions table with columns that > are counters for certain metrics. I started using the incrementColumnValue > method part of the HTable API to update these metrics and that works great. > I was wondering if this function could be used from a MapReduce job. > The TableOutputFormat supports only Delete and Put operations. Using the > Incremental counters saves me from doing any aggregations in my Map Reduce > code. Ideally i would like to just call this function in my mapper and > wouldn't even need a Reducer. > Has anyone run into this use case? I would also love to know if there > are any better alternatives of solving this too. Any info would be great. > > Thanks > Sid
