Return-Path: Delivered-To: apmail-cassandra-commits-archive@www.apache.org Received: (qmail 28034 invoked from network); 6 Jul 2010 20:51:46 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 6 Jul 2010 20:51:46 -0000 Received: (qmail 3273 invoked by uid 500); 6 Jul 2010 20:51:46 -0000 Delivered-To: apmail-cassandra-commits-archive@cassandra.apache.org Received: (qmail 3253 invoked by uid 500); 6 Jul 2010 20:51:46 -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 3245 invoked by uid 99); 6 Jul 2010 20:51:46 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 06 Jul 2010 20:51:46 +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; Tue, 06 Jul 2010 20:51:43 +0000 Received: from thor (localhost [127.0.0.1]) by thor.apache.org (8.13.8+Sun/8.13.8) with ESMTP id o66Khrk0021544 for ; Tue, 6 Jul 2010 20:43:53 GMT Message-ID: <2900104.222831278449033058.JavaMail.jira@thor> Date: Tue, 6 Jul 2010 16:43:53 -0400 (EDT) From: "Matthew F. Dennis (JIRA)" To: commits@cassandra.apache.org Subject: [jira] Assigned: (CASSANDRA-1123) Allow tracing query details In-Reply-To: <31163049.20601274738065474.JavaMail.jira@thor> 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-1123?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Matthew F. Dennis reassigned CASSANDRA-1123: -------------------------------------------- Assignee: (was: Matthew F. Dennis) > Allow tracing query details > --------------------------- > > Key: CASSANDRA-1123 > URL: https://issues.apache.org/jira/browse/CASSANDRA-1123 > Project: Cassandra > Issue Type: New Feature > Components: Core > Reporter: Jonathan Ellis > Fix For: 0.8 > > > In the spirit of CASSANDRA-511, it would be useful to tracing on queries to see where latency is coming from: how long did row cache lookup take? key search in the index? merging the data from the sstables? etc. > The main difference vs setting debug logging is that debug logging is too big of a hammer; by turning on the flood of logging for everyone, you actually distort the information you're looking for. This would be something you could set per-query (or more likely per connection). > We don't need to be as sophisticated as the techniques discussed in the following papers but they are interesting reading: > http://research.google.com/pubs/pub36356.html > http://www.usenix.org/events/osdi04/tech/full_papers/barham/barham_html/ > http://www.usenix.org/event/nsdi07/tech/fonseca.html -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.