Return-Path: 
 <user-return-25486-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org>
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 817239E22
	for <apmail-cassandra-user-archive@www.apache.org>;
 Thu, 12 Apr 2012 07:55:38 +0000 (UTC)
Received: (qmail 65851 invoked by uid 500); 12 Apr 2012 07:55:36 -0000
Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org
Received: (qmail 65739 invoked by uid 500); 12 Apr 2012 07:55:33 -0000
Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm
Precedence: bulk
List-Help: <mailto:user-help@cassandra.apache.org>
List-Unsubscribe: <mailto:user-unsubscribe@cassandra.apache.org>
List-Post: <mailto:user@cassandra.apache.org>
List-Id: <user.cassandra.apache.org>
Reply-To: user@cassandra.apache.org
Delivered-To: mailing list user@cassandra.apache.org
Received: (qmail 65711 invoked by uid 99); 12 Apr 2012 07:55:32 -0000
Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136)
    by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 12 Apr 2012 07:55:32 +0000
X-ASF-Spam-Status: No, hits=2.2 required=5.0
	tests=HTML_MESSAGE,SPF_PASS
X-Spam-Check-By: apache.org
Received-SPF: pass (athena.apache.org: local policy)
Received: from [194.126.128.137] (HELO cer31mx21.cirso.fr) (194.126.128.137)
    by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 12 Apr 2012 07:55:26 +0000
X-PJ: 
In-Reply-To: <7140D00C-77E9-47A6-8375-F827E41B12F0@gmail.com>
To: user@cassandra.apache.org
Subject: Re: Why so many SSTables?
MIME-Version: 1.0
From: Romain HARDOUIN <romain.hardouin@urssaf.fr>
Message-ID: 
 <OFD7F5C67A.784CAD37-ONC12579DE.002B61F9-C12579DE.002B7DC4@urssaf.fr>
Date: Thu, 12 Apr 2012 09:54:04 +0200
Content-Type: multipart/alternative;
 boundary="=_alternative 002B7D6BC12579DE_="
X-Virus-Checked: Checked by ClamAV on apache.org

Message en plusieurs parties au format MIME
--=_alternative 002B7D6BC12579DE_=
Content-Type: text/plain; charset="US-ASCII"

I've just opened a new JIRA: CASSANDRA-4142

I've double checked numbers, 7747 seems to be array list object's capacity 
(Eclipse Memory Analyzer displays "java.lang.Object[7747] @ 0x7d3f3f798").
Actually there are 5757 browsable entries in EMA therefore each object is 
about 140 KB (size varies between 143088 bits and 143768 bits). 

We have no pending compactions tasks. Our cluster is currently 
under-loaded.

Our goal is to handle hundreds of tera bytes which explains 1 TB per node. 
Our need is to archive data so our cluster is not running under a 
read-heavy load.

@Dave Brosius: I made a mistake. To be correct 786 MB is 47% of *leak 
suspects* as reported by Eclipse Memory Analyser.
Our Cassandra nodes are pretty standard: 10 GB of ram with Xmx set to 2,5 
GB.

Regards,

Romain
--=_alternative 002B7D6BC12579DE_=
Content-Type: text/html; charset="US-ASCII"


<br><font size=2><tt>I've just opened a new JIRA: CASSANDRA-4142</tt></font>
<br>
<br><font size=2><tt>I've double checked numbers, 7747 seems to be array
list object's capacity (Eclipse Memory Analyzer displays &quot;java.lang.Object[7747]
@ 0x7d3f3f798&quot;).</tt></font>
<br><font size=2><tt>Actually there are 5757 browsable entries in EMA therefore
each object is about 140 KB (size varies between 143088 bits and 143768
bits). </tt></font>
<br>
<br><font size=2><tt>We have no pending compactions tasks. Our cluster
is currently under-loaded.</tt></font>
<br>
<br><font size=2><tt>Our goal is to handle hundreds of tera bytes which
explains 1 TB per node. Our need is to archive data so our cluster is not
running under a read-heavy load.</tt></font>
<br>
<br><font size=2><tt>@Dave Brosius: I made a mistake. To be correct 786
MB is 47% of *leak suspects* as reported by Eclipse Memory Analyser.</tt></font>
<br><font size=2><tt>Our Cassandra nodes are pretty standard: 10 GB of
ram with Xmx set to 2,5 GB.</tt></font>
<br>
<br><font size=2><tt>Regards,</tt></font>
<br>
<br><font size=2><tt>Romain</tt></font>
--=_alternative 002B7D6BC12579DE_=--