Hi there-
Here is a comment in the RefGuide on joins in the HBase data model.
http://hbase.apache.org/book.html#joins
Short answer, you need to do it yourself (e.g., either with an in-memory
hashmap or instantiating an HTable of the other table, depending on your
situation).
For other MR
The O'Reilly book, MapReduce Design Patterns also covers joins. It's
pretty easy to follow and it gives some good examples. This doesn't cover
the HBase use case, but if you understand how to do a basic set of joins in
map/reduce, you can apply HBase to that model.
On Thu, Jan 24, 2013 at 5:35
