one thing to keep in mind with zing. on the hardware side they recommend the following.
minimum of 6 cores minimum of 32GB of RAM I got an open source license of zing and plan to do some testing this month comparing jdk6, jdk7 and zing. On Thu, Feb 7, 2013 at 1:45 AM, Viktor Jevdokimov < viktor.jevdoki...@adform.com> wrote: > A year ago they asked $10-12k per server – crazy people. With much lower > price they could sell much more.**** > > ** ** > > There’s no advantage for such overpriced product for Cassandra, with some > exceptions.**** > > ** ** > > With RF>1 it is possible for client to early timeout the request and try > on another replica.**** > > ** ** > > For example, for our load, Young Gen GC pauses are ~150ms every 4-5 sec > and requirement for reads is <=40ms.**** > > With RF=4 (average local reads are <1ms), we timeout in 10ms and try form > other replica.**** > > Requests are fulfilled by 1 node in 90%, by 2 nodes in 98%, by 3 nodes in > >99%. SLA keeps at 99.9%, while 98% is acceptable.**** > > Sure we’d like to increase 10ms timeout on client per 1 node request > keeping SLA >99%, but it is impossible without Zing or something else.**** > > ** ** > > We’d like to try latest JRockit JVM, which claims a better GC performance > than HotSpot JVM.**** > > ** ** > > ** ** > > ** ** > Best regards / Pagarbiai > *Viktor Jevdokimov* > Senior Developer > > Email: viktor.jevdoki...@adform.com > Phone: +370 5 212 3063, Fax +370 5 261 0453 > J. Jasinskio 16C, LT-01112 Vilnius, Lithuania > Follow us on Twitter: @adforminsider <http://twitter.com/#!/adforminsider> > Take a ride with Adform's Rich Media Suite<http://vimeo.com/adform/richmedia> > [image: Adform News] <http://www.adform.com> > [image: Adform awarded the Best Employer 2012] > <http://www.adform.com/site/blog/adform/adform-takes-top-spot-in-best-employer-survey/> > > Disclaimer: The information contained in this message and attachments is > intended solely for the attention and use of the named addressee and may be > confidential. If you are not the intended recipient, you are reminded that > the information remains the property of the sender. You must not use, > disclose, distribute, copy, print or rely on this e-mail. If you have > received this message in error, please contact the sender immediately and > irrevocably delete this message and any copies. > > *From:* Wei Zhu [mailto:wz1...@yahoo.com] > *Sent:* Wednesday, February 06, 2013 19:56 > > *To:* user@cassandra.apache.org > *Subject:* Re: Why do Datastax docs recommend Java 6?**** > > ** ** > > 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 <edlinuxg...@gmail.com> > *To:* user@cassandra.apache.org > *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 < > viktor.jevdoki...@adform.com> 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**** > > ** ** > > Email: viktor.jevdoki...@adform.com**** > > Phone: +370 5 212 3063, Fax +370 5 261 0453**** > > J. Jasinskio 16C, LT-01112 Vilnius, Lithuania**** > > Follow us on Twitter: @adforminsider <http://twitter.com/#!/adforminsider> > **** > > Take a ride with Adform's Rich Media Suite<http://vimeo.com/adform/richmedia> > **** > > [image: Adform News] <http://www.adform.com/>**** > > [image: Adform awarded the Best Employer > 2012]<http://www.adform.com/site/blog/adform/adform-takes-top-spot-in-best-employer-survey/> > **** > > > Disclaimer: The information contained in this message and attachments is > intended solely for the attention and use of the named addressee and may be > confidential. If you are not the intended recipient, you are reminded that > the information remains the property of the sender. You must not use, > disclose, distribute, copy, print or rely on this e-mail. If you have > received this message in error, please contact the sender immediately and > irrevocably delete this message and any copies. **** > > ** ** > > *From:* jef...@gmail.com [mailto:jef...@gmail.com] > *Sent:* Wednesday, February 06, 2013 02:23 > *To:* user@cassandra.apache.org > *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" <i...@metricshub.com> **** > > *Date: *Tue, 5 Feb 2013 14:09:33 -0800**** > > *To: *<user@cassandra.apache.org>**** > > *ReplyTo: *user@cassandra.apache.org **** > > *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:mkjell...@barracuda.com<mkjell...@barracuda.com>] > > *Sent:* Tuesday, February 05, 2013 7:29 AM > *To:* user@cassandra.apache.org > *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 <ba...@xaprb.com> > *Reply-To: *"user@cassandra.apache.org" <user@cassandra.apache.org> > *Date: *Tuesday, February 5, 2013 7:21 AM > *To: *"user@cassandra.apache.org" <user@cassandra.apache.org> > *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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