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Oracle now owns the sun hotspot team, which is inarguably the highest powered java vm team in the world. Its still really the epicenter of all java vm development.
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Date: Tue, 5 Feb 2013 14:09:33 -0800
Subject: RE: Why do Datastax docs recommend Java 6?
Also, what is particular reason to use Oracle JDK over Open JDK? Sorry, I could not find this information online.
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 AFAIK.
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!