On Thu, Mar 1, 2018 at 11:03 PM, Andrew Wang <andrew.w...@cloudera.com>

Owen mentioned making a Hadoop subproject; we'd have to
> hash out what exactly this means (I assume a separate repo still managed by
> the Hadoop project), but I think we could make this work if it's more
> attractive than incubation or a new TLP.

Ok, there are multiple levels of sub-projects that all make sense:

   - Same source tree, same releases - examples like HDFS & YARN
   - Same master branch, separate releases and release branches - Hive's
   Storage API vs Hive. It is in the source tree for the master branch, but
   has distinct releases and release branches.
   - Separate source, separate release - Apache Commons.

There are advantages and disadvantages to each. I'd propose that we use the
same source, same release pattern for Ozone. Note that we tried and later
reverted doing Common, HDFS, and YARN as separate source, separate release
because it was too much trouble. I like Daryn's idea of putting it as a top
level directory in Hadoop and making sure that nothing in Common, HDFS, or
YARN depend on it. That way if a Release Manager doesn't think it is ready
for release, it can be trivially removed before the release.

One thing about using the same releases, Sanjay and Jitendra are signing up
to make much more regular bugfix and minor releases in the near future. For
example, they'll need to make 3.2 relatively soon to get it released and
then 3.3 somewhere in the next 3 to 6 months. That would be good for the
project. Hadoop needs more regular releases and fewer big bang releases.

.. Owen

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