Return-Path: Delivered-To: apmail-couchdb-dev-archive@www.apache.org Received: (qmail 99792 invoked from network); 8 Mar 2011 18:44:24 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 8 Mar 2011 18:44:24 -0000 Received: (qmail 33162 invoked by uid 500); 8 Mar 2011 18:44:23 -0000 Delivered-To: apmail-couchdb-dev-archive@couchdb.apache.org Received: (qmail 33088 invoked by uid 500); 8 Mar 2011 18:44:23 -0000 Mailing-List: contact dev-help@couchdb.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@couchdb.apache.org Delivered-To: mailing list dev@couchdb.apache.org Received: (qmail 32906 invoked by uid 99); 8 Mar 2011 18:44:23 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 08 Mar 2011 18:44:23 +0000 X-ASF-Spam-Status: No, hits=-2000.0 required=5.0 tests=ALL_TRUSTED,T_RP_MATCHES_RCVD X-Spam-Check-By: apache.org Received: from [140.211.11.116] (HELO hel.zones.apache.org) (140.211.11.116) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 08 Mar 2011 18:44:21 +0000 Received: from hel.zones.apache.org (hel.zones.apache.org [140.211.11.116]) by hel.zones.apache.org (Postfix) with ESMTP id 7640E39DB40 for ; Tue, 8 Mar 2011 18:43:59 +0000 (UTC) Date: Tue, 8 Mar 2011 18:43:59 +0000 (UTC) From: "Jan Lehnardt (JIRA)" To: dev@couchdb.apache.org Message-ID: <487525932.5720.1299609839480.JavaMail.tomcat@hel.zones.apache.org> In-Reply-To: <823419600.3437.1299550079623.JavaMail.tomcat@hel.zones.apache.org> Subject: [jira] Commented: (COUCHDB-1084) Remove unnecessary btree lookup inside couch_db_updater 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/COUCHDB-1084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13004131#comment-13004131 ] Jan Lehnardt commented on COUCHDB-1084: --------------------------------------- Relaximation r/w test, on My MacBook & SSD, test and DBs on the same machine: http://graphs.mikeal.couchone.com/#/graph/698bf36b6c64dbd19aa2bef63400268f About 10-20% more req/s and significant lower latency. > Remove unnecessary btree lookup inside couch_db_updater > ------------------------------------------------------- > > Key: COUCHDB-1084 > URL: https://issues.apache.org/jira/browse/COUCHDB-1084 > Project: CouchDB > Issue Type: Improvement > Components: Database Core > Affects Versions: 1.2 > Reporter: Damien Katz > Assignee: Damien Katz > Attachments: remove_btree_lookup.patch > > > The CouchDB update process has an unnecessary btree lookup, where it reads the values in bulks, checks for conflicts, writes the docs to disk, updates the values appropriately and writes them to the btree out in a second step. It's possible to avoid this second step, and instead do all the checking, doc writing and value transformation in a single btree lookup, thereby reducing the number of btree traversals and disk IO. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira