Unfortunately even though we documented wire compatiblity, cross-version client/server support doesn't yet really work for YARN and MapReduce. We can only do that once we have wire-compatibility and eventually rolling upgrades. No fix is in sight for MAPREDUCE-5831 - for now both clients and AMs have to upgrade together in the MapReduce land..
+Vinod On Wed, Jun 18, 2014 at 6:52 PM, Zhijie Shen <zs...@hortonworks.com> wrote: > Point to another MR compatibility issue marked for 2.4.1: MAPREDUCE-5831 > Old MR client is not compatible with new MR application, though it happens > since 2.3. > > It would be good to figure out whether we include it now or later. It seems > that we're going to be in a better position once we have versioning for MR > components. > -- CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.
