Re: Why do Datastax docs recommend Java 6?

Wed, 06 Feb 2013 09:56:55 -0800

Anyone has first hand experience with Zing JVM which is claimed to be pauseless? How do they charge, per CPU?

Thanks
-Wei
From: Edward Capriolo <[email protected]>
To: [email protected]
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 :)
http://www.oracle.com/technetwork/middleware/jrockit/overview/index.html

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 <[email protected]> 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

J. Jasinskio 16C, LT-01112 Vilnius, Lithuania
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From: [email protected] [mailto:[email protected]]
Sent: Wednesday, February 06, 2013 02:23
To: [email protected]
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" <[email protected]>
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.
 
Thanks,
Ilya
From: Michael Kjellman [mailto:[email protected]]
Sent: Tuesday, February 05, 2013 7:29 AM
To: [email protected]
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!
 
Best,
Michael
 
From: Baron Schwartz <[email protected]>
Reply-To: "[email protected]" <[email protected]>
Date: Tuesday, February 5, 2013 7:21 AM
To: "[email protected]" <[email protected]>
Subject: Why do Datastax docs recommend Java 6?
 
The Datastax docs repeatedly say (e.g. http://www.datastax.com/docs/1.2/install/install_jre) 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, http://wiki.apache.org/cassandra/GettingStarted
 
- Baron



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