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From "Ilya Grebnov" <>
Subject RE: Why do Datastax docs recommend Java 6?
Date Tue, 05 Feb 2013 22:09:33 GMT
Also, what is particular reason to use Oracle JDK over Open JDK? Sorry, I
could not find this information online.




From: Michael Kjellman [] 
Sent: Tuesday, February 05, 2013 7:29 AM
Subject: Re: Why do Datastax docs recommend Java 6?


There have been tons of threads/convos on this.


In the early days of Java 7 it was pretty unstable and there was pretty much
no convincing reason to use Java 7 over Java 6.


Now that Java 7 has stabilized and Java 6 is EOL it's a reasonable decision
to use Java 7 and we do it in production with no issues to speak of.


That being said there was one potential situation we've seen as a community
where bootstrapping new node was using 3x more CPU and getting significantly
less throughput. However, reproducing this consistently never happened


I think until more people use Java 7 in production and prove it doesn't
cause any additional bugs/performance issues Datastax will update their
docs. Until now I'd say it's a safe bet to use Java 7 with Vanilla C* 1.2.1.
I hope this helps!





From: Baron Schwartz <>
Reply-To: "" <>
Date: Tuesday, February 5, 2013 7:21 AM
To: "" <>
Subject: Why do Datastax docs recommend Java 6?


The Datastax docs repeatedly say (e.g. that Java 7 is not
recommended, but they don't say why. It would be helpful to know this. Does
anyone know? 


The same documentation is referenced from the Cassandra wiki, for example,


- Baron

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