From user-return-31671-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org Tue Feb 5 22:10:05 2013 Return-Path: X-Original-To: apmail-cassandra-user-archive@www.apache.org Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id EC28FEA33 for ; Tue, 5 Feb 2013 22:10:04 +0000 (UTC) Received: (qmail 79855 invoked by uid 500); 5 Feb 2013 22:10:01 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 79800 invoked by uid 500); 5 Feb 2013 22:10:01 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 79724 invoked by uid 99); 5 Feb 2013 22:10:01 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 05 Feb 2013 22:10:01 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of ilya@metricshub.com designates 209.85.210.48 as permitted sender) Received: from [209.85.210.48] (HELO mail-da0-f48.google.com) (209.85.210.48) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 05 Feb 2013 22:09:56 +0000 Received: by mail-da0-f48.google.com with SMTP id v40so269759dad.21 for ; Tue, 05 Feb 2013 14:09:35 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:from:to:references:in-reply-to:subject:date:message-id :mime-version:content-type:x-mailer:thread-index:content-language :x-gm-message-state; bh=SIySV92S227tnNZONXtHESvJFtyLPRucEtoQc+GwfqU=; b=TJbY3oeXE0YVtQ6GnTaxCerO2OVUEusPj3VYuA4d+BZVt/X/LVSF6apFNB1MWZzl7b ppFLEv5fg0SIT3EDT5m+YmfonqEYt+OnapRRFyRs6m3YtgatghoBQOjsEhRpjGDuTPht 9sMxIyg9lfGJpSYKttRAn06VvDjs+CBAHiR3HLCHDHWUJO6aqVQjYWO1UegM0AmMehul F3O9ALElRicTk0VYuAwrVXK9dGBm5IXFT9OwjJ/JvY+jDNWLdZ6LWScYmWSS2mfxpndw PB+8JNkqJ2r8HLSIWKcc7xqLH7Du3rqeq7nIEIEx+tCntWNUeJbBeMGbRRCxFPOHgHPJ Uh1w== X-Received: by 10.66.86.71 with SMTP id n7mr68572386paz.77.1360102174824; Tue, 05 Feb 2013 14:09:34 -0800 (PST) Received: from ilyadev ([131.107.192.131]) by mx.google.com with ESMTPS id w2sm26981495pax.22.2013.02.05.14.09.33 (version=TLSv1 cipher=RC4-SHA bits=128/128); Tue, 05 Feb 2013 14:09:34 -0800 (PST) From: "Ilya Grebnov" To: References: In-Reply-To: Subject: RE: Why do Datastax docs recommend Java 6? Date: Tue, 5 Feb 2013 14:09:33 -0800 Message-ID: <18f701ce03ed$7ac22780$70467680$@metricshub.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_18F8_01CE03AA.6CA13170" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQGkf458UNmEOI7bcDJt8RyZ/IlWSpi+2ynQ Content-Language: en-us X-Gm-Message-State: ALoCoQkeuHOwpUN8BsCRU9oASPYqXjHZIYIDKvh+yO42Kj9GM0VnZZkLSv6iHktqhvEq4nJGGLZD X-Virus-Checked: Checked by ClamAV on apache.org This is a multipart message in MIME format. ------=_NextPart_000_18F8_01CE03AA.6CA13170 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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:mkjellman@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 Reply-To: "user@cassandra.apache.org" Date: Tuesday, February 5, 2013 7:21 AM To: "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 ------=_NextPart_000_18F8_01CE03AA.6CA13170 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

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:mkjellman@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 <baron@xaprb.com>
Reply-To: = "user@cassandra.apache.org&q= uot; <user@cassandra.apache.org&g= t;
Date: Tuesday, February 5, 2013 7:21 AM
To: = "user@cassandra.apache.org&q= uot; <user@cassandra.apache.org&g= t;
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.apac= he.org/cassandra/GettingStarted

 

- = Baron

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