3.0 has "off the heap memtable" impl removed and if you have a requirement for 
this,its not available.If you don't have the requirement 3.0.9 can be tried 
out. 3.9 version we did some testing and find lot issues in compaction,hint 
corruption etc.

Regards

Hari


________________________________
From: Discovery <wl_...@qq.com>
Sent: Tuesday, November 29, 2016 5:59 PM
To: user
Subject: Re: Which version is stable enough for production environment?

Why version 3.x is not recommended?  Thanks.


------------------ Original ------------------
From:  "Harikrishnan Pillai";<hpil...@walmartlabs.com>;
Date:  Wed, Nov 30, 2016 09:57 AM
To:  "user"<user@cassandra.apache.org>;
Subject:  Re: Which version is stable enough for production environment?


Cassandra 2.1.16


________________________________
From: Discovery <wl_...@qq.com>
Sent: Tuesday, November 29, 2016 5:42 PM
To: user
Subject: Which version is stable enough for production environment?

Hi Cassandra Experts,

                  We prepare to deploy Cassandra in production env, but we can 
not confirm which version is stable and recommended, could someone in this mail 
list give the suggestion? Thanks in advance!


Best Regards
Discovery
11/30/2016

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