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From "Dhodapkar, Chinmay" <chinm...@qualcomm.com>
Subject Hbase + mapreduce -- operational design question
Date Fri, 09 Sep 2011 21:54:45 GMT
Hello,
I have a setup where a bunch of clients store 'events' in an Hbase table . Also, periodically(once
a day), I run a mapreduce job that goes over the table and computes some reports.

Now my issue is that the next time I don't want mapreduce job to process the 'events' that
it has already processed previously. I know that I can mark processed event in the hbase table
and the mapper can filter them them out during the next run. But what I would really like/want
is that previously processed events don't even hit the mapper.

One solution I can think of is to backup the hbase table after running the job and then clear
the table. But this has lot of problems..
1) Clients may have inserted events while the job was running.
2) I could disable and drop the table and then create it again...but then the clients would
complain about this short window of unavailability.


What do people using Hbase (live) + mapreduce typically do. ?

Thanks!
Chinmay


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