I'm opening this to continue the discussion I started a while back: http://mail-archives.apache.org/mod_mbox/hbase-user/201405.mbox/%3CCAMUu0w_XooxeG779rRFjTuRAU+UxeAvuNzxKw9dxFO-gh5yVUw@mail.gmail.com%3E.
To summarize, I think the MapReduce classes used by clients (like TableMapper, TableReducer, etc) don't belong in hbase-server. This forces the user to pull in a rather large artifact for a relatively small number of classes. These should either be put in hbase-client, or possibly an artifact of their own (like the hbase-mapreduce idea Enis suggested).
|Create base hbase-mapred and hbase-io modules, move HTableInputFormat and HTableOutputFormat||Resolved||Unassigned|