Return-Path: Delivered-To: apmail-incubator-cassandra-user-archive@minotaur.apache.org Received: (qmail 55814 invoked from network); 25 Feb 2010 14:10:15 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 25 Feb 2010 14:10:15 -0000 Received: (qmail 31007 invoked by uid 500); 25 Feb 2010 14:10:15 -0000 Delivered-To: apmail-incubator-cassandra-user-archive@incubator.apache.org Received: (qmail 30992 invoked by uid 500); 25 Feb 2010 14:10:15 -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 30983 invoked by uid 99); 25 Feb 2010 14:10:15 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 25 Feb 2010 14:10:14 +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 74.125.82.47 as permitted sender) Received: from [74.125.82.47] (HELO mail-ww0-f47.google.com) (74.125.82.47) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 25 Feb 2010 14:10:06 +0000 Received: by wwb22 with SMTP id 22so1842716wwb.6 for ; Thu, 25 Feb 2010 06:09:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=e0fSohVPTKlynPAdxPMtc94vsabwXvf+fF5qq8rsdFU=; b=KjCWXJxWtY1jZUJLPmgeUkm9V9k8DkM/DVOO618+X/H1dsV1UJaJrpadprChlyKOXD XxNS7m/bBNmDtMuQEQnTFBe1JEC4hXylOudWOKpW5sAzXmlIg6QxPi8Ive1MNLfHPrY7 8DzE7KWDcZaAd3v01fK2x8wPJn1MqfMky+eQk= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; b=FGUtStruxpORZMoNfwE2JfyzydGPLjm+DdlsafuxPOhiXpWjmWvd1vnpIEaj/NRUgC q/bOedzCaJATecjc9JDeTGQfIEfzb4/5ujUmyxOC37Ch2n+q7GiULgDv6N2XXDUGXBPu SovAYyiraTyMRpK6gFet5ypGlCwKf0m+Ecljw= MIME-Version: 1.0 Received: by 10.216.87.197 with SMTP id y47mr737919wee.8.1267106986553; Thu, 25 Feb 2010 06:09:46 -0800 (PST) In-Reply-To: References: <5f7770581002161028s21c54cdfk846e2c973d06aaf6@mail.gmail.com> <5f7770581002201047o460920eaof123002783fcfbb9@mail.gmail.com> Date: Thu, 25 Feb 2010 16:09:46 +0200 Message-ID: Subject: Re: cassandra freezes From: Boris Shulman To: cassandra-user@incubator.apache.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Virus-Checked: Checked by ClamAV on apache.org In these tests I perform only write operations, no reads. On Thu, Feb 25, 2010 at 4:07 PM, Jonathan Ellis wrote: > The only kind of "freeze" that makes sense there is your reads are i/o > bound and the extra disk activity is killing you. =A0In that case the > fix is to add more RAM, or give less to the JVM so the OS can use more > for buffer cache. > > On Thu, Feb 25, 2010 at 8:01 AM, Boris Shulman wrote= : >> In my case the cassandra node freezes while memtable flush operation >> is performed or compactation operation is performed. How can I >> optimize the cassandra configuration in order to avoid this behavior? >> I've tried both using large memtable size (1G) and small (128M) but in >> every case I have some sort of freezes when the data is flushed to the >> disk. >> >> Please advice. >> >