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From Wei Zhu <>
Subject Re: Why do Datastax docs recommend Java 6?
Date Wed, 06 Feb 2013 17:56:27 GMT
Anyone has first hand experience with Zing JVM which is claimed to be pauseless? How do they
charge, per CPU?


 From: Edward Capriolo <>
Sent: Wednesday, February 6, 2013 7:07 AM
Subject: Re: Why do Datastax docs recommend Java 6?

Oracle already did this once, It was called jrockit :)

Typically oracle acquires they technology and then the bits are merged with the standard JVM. 

On Wed, Feb 6, 2013 at 2:13 AM, Viktor Jevdokimov <> wrote:

I would prefer Oracle to own an Azul’s Zing JVM over any other (GC) to provide it for free
for anyone :)
>Best regards / Pagarbiai
>Viktor Jevdokimov
>Senior Developer
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>Sent: Wednesday, February 06, 2013 02:23
>Subject: Re: Why do Datastax docs recommend Java 6?
>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.
>Sent from my Verizon Wireless BlackBerry
>From: "Ilya Grebnov" <> 
>Date: Tue, 5 Feb 2013 14:09:33 -0800
>To: <>
>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.
>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 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!
>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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