Return-Path: Delivered-To: apmail-incubator-cassandra-user-archive@minotaur.apache.org Received: (qmail 53926 invoked from network); 16 Feb 2010 14:26:01 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 16 Feb 2010 14:26:01 -0000 Received: (qmail 4134 invoked by uid 500); 16 Feb 2010 14:26:00 -0000 Delivered-To: apmail-incubator-cassandra-user-archive@incubator.apache.org Received: (qmail 4108 invoked by uid 500); 16 Feb 2010 14:26:00 -0000 Mailing-List: contact cassandra-user-help@incubator.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: cassandra-user@incubator.apache.org Delivered-To: mailing list cassandra-user@incubator.apache.org Received: (qmail 4099 invoked by uid 99); 16 Feb 2010 14:26:00 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 16 Feb 2010 14:26:00 +0000 X-ASF-Spam-Status: No, hits=-0.0 required=10.0 tests=SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of shulmanb@gmail.com designates 209.85.219.228 as permitted sender) Received: from [209.85.219.228] (HELO mail-ew0-f228.google.com) (209.85.219.228) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 16 Feb 2010 14:25:52 +0000 Received: by mail-ew0-f228.google.com with SMTP id 28so1584367ewy.28 for ; Tue, 16 Feb 2010 06:25:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:content-type; bh=+cQABMcHyAg5Xv7S1dNnzHbNrYi6sxsv0zGZZgWajCg=; b=uDEpwK8wR3o3qoUVemYYeXOQ9rOkR10d7N/jFiyU26TI9UZva2fv3ZBqOVoou2Nf+j LLnyJ6kd1TkuAdXknySy9vSzjha7xkkm69weFJ05uqWsv5tD3mZgTpseaW0TJapao3mA BweVNZRqA01MEi2KZ5Tph2jLkgeKzHShMk6KY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=oOExcC1izyqEUMxs50LuSlnLt8BSdMtZhqwGeyVD6fJE5n0LDBGFSxQtg26s0aiMut rUhMhrIOKvP+ugiWI/4ZOUXwsB0yzWrFCE/50GZWIVB0GI7lY0r8hH8E5cesNJE9YimJ 0c7/dX2g4+09txAoqerFTVpFFeCPeVLzAqbqQ= MIME-Version: 1.0 Received: by 10.216.89.12 with SMTP id b12mr317452wef.93.1266330332700; Tue, 16 Feb 2010 06:25:32 -0800 (PST) Date: Tue, 16 Feb 2010 16:25:32 +0200 Message-ID: Subject: cassandra freezes From: Boris Shulman To: cassandra-user@incubator.apache.org Content-Type: text/plain; charset=ISO-8859-1 X-Virus-Checked: Checked by ClamAV on apache.org Hello, I'm running some benchmarks on 2 cassandra nodes each running on 8 cores machine with 16G RAM, 10G for Java heap. I've noticed that during benchmarks with numerous writes cassandra just freeze for several minutes (in those benchmarks I'm writing batches of 10 columns with 1K data each for every key in a single CF). Usually after performing 50K writes I'm getting a TimeOutException and cassandra just freezes. What configuration changes can I make in order to prevent this? Is it possible that my setup just can't handle the load? How can I calculate the number of casandra nodes for a desired load?