Return-Path: Delivered-To: apmail-hadoop-core-user-archive@www.apache.org Received: (qmail 79045 invoked from network); 21 Jul 2008 10:06:08 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 21 Jul 2008 10:06:08 -0000 Received: (qmail 57230 invoked by uid 500); 21 Jul 2008 10:06:03 -0000 Delivered-To: apmail-hadoop-core-user-archive@hadoop.apache.org Received: (qmail 57194 invoked by uid 500); 21 Jul 2008 10:06:03 -0000 Mailing-List: contact core-user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: core-user@hadoop.apache.org Delivered-To: mailing list core-user@hadoop.apache.org Received: (qmail 57183 invoked by uid 99); 21 Jul 2008 10:06:03 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 21 Jul 2008 03:06:03 -0700 X-ASF-Spam-Status: No, hits=-0.0 required=10.0 tests=SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: local policy) Received: from [141.76.44.180] (HELO se.inf.tu-dresden.de) (141.76.44.180) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 21 Jul 2008 10:05:08 +0000 Received: from [141.76.44.201] (sedell01.inf.tu-dresden.de [141.76.44.201]) by se.inf.tu-dresden.de (Postfix) with ESMTP id 5D6C18E78B for ; Mon, 21 Jul 2008 12:05:01 +0200 (CEST) Message-ID: <48845F4C.6080808@se.inf.tu-dresden.de> Date: Mon, 21 Jul 2008 12:05:00 +0200 From: Gert Pfeifer Organization: TU Dresden User-Agent: Thunderbird 2.0.0.14 (X11/20080505) MIME-Version: 1.0 To: core-user@hadoop.apache.org Subject: Re: Can a MapReduce task only consist of a Map step? References: In-Reply-To: X-Enigmail-Version: 0.95.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Virus-Checked: Checked by ClamAV on apache.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Did you try to use the IdentityReducer? Zhou, Yunqing wrote: > I only use it to do something in parallel,but the reduce step will cost me > additional several days, is it possible to make hadoop do not use a reduce > step? > > Thanks > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iQIVAwUBSIRfTP4RHiapZN5BAQLIwA/7Bmkza40S/UrFi1JLECppLfFwe7v+WcM1 H5keFsV3xrQ7Pyz8WiR8ERwFbNKc0Men0Msp5CSoZQTRpEiKYhhbQVKTlz9tfc2w qcB23j8pPFWxP11mKYciUZFexDIz9+rNvmHQFFFxiVoib6URve3a6cxbz6zuScac KHSynC/x+2tS4BDCmJ7mhJWUIcTGLhHxig5ruz7rMWJQLXAIg0JP0m1nQCyREmxs FlAgc+SBYdvLBygpE+CkB1JDWDfa6PKS6RqMmzAsiQU6vVQxd603KWkTOSCrDTbd QZkDTntHIcpLDQ2ReCdttM4QoA2k2t3UFfveDzKSJcfnO33gedlZ4uVdu+t7tNUd JLtRQyTpql1k1nFA9TzfWl2S/py913QOhfesfVnZpbGNfrNPh7DI//EsO0BKW80g L2hGzfW386LhgDwG0w9FWrMh1PDQZEvc6NOzW3DbjIzaBkdIxM3+J2tVs7xA9idj H0kXCFVYGzBQ/FgcJtg1qecf9mIQ35xkTbRH9G+HEd/4XK0iQeTnB7I/e3F+OP1h 85pf6JN6do70Cr8YKvTq6n7M4IZ3nbMYcXiNS9isB+VOriJ4qGrJK4DnEQh0eICX L2sPXw7gt7a0r+kUexpprFfscSIm2YljrCKb/2zxR+hYai4+/gZNguYb3g14dP2Q TV1K2XN/VA8= =GWU6 -----END PGP SIGNATURE-----