From user-return-2393-apmail-couchdb-user-archive=couchdb.apache.org@couchdb.apache.org Sun Dec 28 14:55:02 2008 Return-Path: Delivered-To: apmail-couchdb-user-archive@www.apache.org Received: (qmail 4853 invoked from network); 28 Dec 2008 14:55:02 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 28 Dec 2008 14:55:02 -0000 Received: (qmail 10606 invoked by uid 500); 28 Dec 2008 14:55:01 -0000 Delivered-To: apmail-couchdb-user-archive@couchdb.apache.org Received: (qmail 10577 invoked by uid 500); 28 Dec 2008 14:55:00 -0000 Mailing-List: contact user-help@couchdb.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@couchdb.apache.org Delivered-To: mailing list user@couchdb.apache.org Received: (qmail 10566 invoked by uid 99); 28 Dec 2008 14:55:00 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 28 Dec 2008 06:55:00 -0800 X-ASF-Spam-Status: No, hits=0.2 required=10.0 tests=RCVD_IN_DNSWL_LOW,SPF_HELO_PASS,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (athena.apache.org: 216.86.168.178 is neither permitted nor denied by domain of geir@pobox.com) Received: from [216.86.168.178] (HELO mxout-03.mxes.net) (216.86.168.178) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 28 Dec 2008 14:54:53 +0000 Received: from [10.0.1.194] (unknown [67.86.14.166]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by smtp.mxes.net (Postfix) with ESMTPSA id 7AA9F23E3F3 for ; Sun, 28 Dec 2008 09:54:29 -0500 (EST) Message-Id: <57F0DD6D-45D2-4A27-A32F-D1808C388379@pobox.com> From: "Geir Magnusson Jr." To: user@couchdb.apache.org In-Reply-To: Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (Apple Message framework v929.2) Subject: Re: newbie question #1 Date: Sun, 28 Dec 2008 09:54:29 -0500 References: <98979283-BB61-4D15-AF05-196979FA42BC@pobox.com> <7127C806-65EA-4C3E-94A4-EE9E1390C38C@pobox.com> <9D00C4A1-189E-4263-8978-DC86FFDB6691@pobox.com> X-Mailer: Apple Mail (2.929.2) X-Virus-Checked: Checked by ClamAV on apache.org On Dec 28, 2008, at 9:36 AM, Paul Davis wrote: > [snip] >> I read the view docs (and have other questions there, like if the M/ >> R is >> distributed across a cluster - I've used M/R w/ Hadoop, so I come >> w/ a set >> of assumptions...) and I saw that it doesn't *appear* that the key >> or id is >> injected in the view doc, which of course brings up an obvious >> question :) > > The CouchDB implementation of Map/Reduce (specifically reduce) is a > bit different the the canonical implementation. Mostly this is a > result of being stored in a btree and Damien's cleverness. > Does the work get distributed across nodes, or does each node do the same thing? geir