Return-Path: Delivered-To: apmail-cassandra-commits-archive@www.apache.org Received: (qmail 11185 invoked from network); 9 Dec 2010 22:24:26 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 9 Dec 2010 22:24:26 -0000 Received: (qmail 24848 invoked by uid 500); 9 Dec 2010 22:24:26 -0000 Delivered-To: apmail-cassandra-commits-archive@cassandra.apache.org Received: (qmail 24776 invoked by uid 500); 9 Dec 2010 22:24:26 -0000 Mailing-List: contact commits-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@cassandra.apache.org Delivered-To: mailing list commits@cassandra.apache.org Received: (qmail 24768 invoked by uid 99); 9 Dec 2010 22:24:26 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 09 Dec 2010 22:24:26 +0000 X-ASF-Spam-Status: No, hits=-2000.0 required=10.0 tests=ALL_TRUSTED X-Spam-Check-By: apache.org Received: from [140.211.11.22] (HELO thor.apache.org) (140.211.11.22) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 09 Dec 2010 22:24:23 +0000 Received: from thor (localhost [127.0.0.1]) by thor.apache.org (8.13.8+Sun/8.13.8) with ESMTP id oB9MO2Cu025576 for ; Thu, 9 Dec 2010 22:24:02 GMT Message-ID: <4665650.47211291933442174.JavaMail.jira@thor> Date: Thu, 9 Dec 2010 17:24:02 -0500 (EST) From: "Jonathan Ellis (JIRA)" To: commits@cassandra.apache.org Subject: [jira] Commented: (CASSANDRA-1470) use direct io for compaction MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 X-Virus-Checked: Checked by ClamAV on apache.org [ https://issues.apache.org/jira/browse/CASSANDRA-1470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12969973#action_12969973 ] Jonathan Ellis commented on CASSANDRA-1470: ------------------------------------------- Also: sounds like we should have an executor in charge of doing the write, so the compaction thread can start filling the next buffer immediately > use direct io for compaction > ---------------------------- > > Key: CASSANDRA-1470 > URL: https://issues.apache.org/jira/browse/CASSANDRA-1470 > Project: Cassandra > Issue Type: Improvement > Components: Core > Reporter: Jonathan Ellis > Assignee: Pavel Yaskevich > Fix For: 0.7.1 > > Attachments: 1470-v2.txt, 1470.txt, CASSANDRA-1470-for-0.6.patch, CASSANDRA-1470-v10-for-0.7.patch, CASSANDRA-1470-v11-for-0.7.patch, CASSANDRA-1470-v12-0.7.patch, CASSANDRA-1470-v2.patch, CASSANDRA-1470-v3-0.7-with-LastErrorException-support.patch, CASSANDRA-1470-v4-for-0.7.patch, CASSANDRA-1470-v5-for-0.7.patch, CASSANDRA-1470-v6-for-0.7.patch, CASSANDRA-1470-v7-for-0.7.patch, CASSANDRA-1470-v8-for-0.7.patch, CASSANDRA-1470-v9-for-0.7.patch, CASSANDRA-1470.patch, use.DirectIORandomAccessFile.for.commitlog.against.1022235.patch > > > When compaction scans through a group of sstables, it forces the data in the os buffer cache being used for hot reads, which can have a dramatic negative effect on performance. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.