Let's consider branching for HBase 1.5. The new feature justifying a minor increment is storage class aware placement (HBASE-19858), and a required update in Hadoop minimum version. It would be marked experimental. However, some of our Chinese colleagues have been running equivalent changes in production for a couple of years and all tests I've done with it look positive.
Hadoop hasn't released 2.6 or below in ages. In all recent discussions I have found on their public lists, there are no plans to do so. They are still releasing 2.7. Therefore, I think it fair to conclude the earliest supported version of Hadoop by the Hadoop community is 2.7, and we can adopt this position too. When putting together a 1.5.0 release I would update documentation to reflect that the minimum supported Hadoop version is now 2.7.0, and put a note to this effect in the release notes. Are there any concerns? Related, a nice to have for the new HBase 1.5 code line would be successful compilation against Hadoop 2.9, 3.0 and 3.1. -- Best regards, Andrew Words like orphans lost among the crosstalk, meaning torn from truth's decrepit hands - A23, Crosstalk
