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From Josh Elser <>
Subject Re: Hadoop 2.0 Support for Accumulo 1.4 Branch
Date Tue, 12 Nov 2013 21:49:20 GMT
On 11/12/13, 1:26 PM, Sean Busbey wrote:
> On Tue, Nov 12, 2013 at 2:48 PM, Josh Elser <> wrote:
>> What about the other half: "encouraging" users to lag (soon to be) two
>> major releases behind?
> I don't think our current user base needs to be encouraged strongly to
> upgrade. And as I said previously I think this change provides them with an
> upgrade path that's easier to stomach, but I suspect this is a point we
> disagree on.

Yes, I believe that disagreement to be accurate :). IMO, HDFS WALs are 
themselves a sufficient feature to strongly encourage users to upgrade 
from 1.4 to 1.5 when running Accumulo in a production environment.

However, I do want to say that my feelings are not solely influenced by 
1.5 features that 1.4 does not have. Providing avenues for users to use 
old versions of code is extremely degrading to the morale of developers 
who are trying to innovate and make things better upstream.

Having to repeatedly answer questions about why things are the way they 
are or why they are sub-optimal with "If you upgraded, it wouldn't be an 
issue" can be very depressing to a growing community. There are multiple 
amazing devs who have invested crazy units of effort into making 1.5 and 
(soon) 1.6 be a reality -- I want to make sure as a community we 
encourage our users to reap the benefits of that work, and let 
aforementioned devs see successes from their effort.

Also, users still aren't precluded from using 1.4 if they so choose (and 
if critical bugs are found, it's very likely for them to be patched in 
1.4). I don't see it as unreasonable to force users to upgrade to a 
newer version of Accumulo to use a newer version of Hadoop.

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