follow the progress on DISTRO-393
I am putting this in 1.4 not because I am sure it will be resolved by then but because we need to work on it with the highest urgency. If support for mr1 is dropped we are in trouble.
This may be related as well https://issues.apache.org/jira/browse/MAPREDUCE-1122
this is now RevolutionAnalytics/rmr2#6