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From Arun C Murthy <...@hortonworks.com>
Subject Re: [VOTE] Release Apache Hadoop 2.4.1
Date Fri, 20 Jun 2014 18:29:00 GMT
On Jun 20, 2014, at 11:23 AM, Vinod Kumar Vavilapalli <vinodkv@apache.org> wrote:

> 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..


Actually, that is a reasonable expectation - particularly because we should all be migrating
towards MAPREDUCE-4421 and should stop installing MR on every node.

Arun

> 
> +Vinod
> 
> On Wed, Jun 18, 2014 at 6:52 PM, Zhijie Shen <zshen@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.
>> 
> 
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--
Arun C. Murthy
Hortonworks Inc.
http://hortonworks.com/hdp/



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