From mapreduce-issues-return-11796-apmail-hadoop-mapreduce-issues-archive=hadoop.apache.org@hadoop.apache.org Tue Mar 23 01:25:48 2010 Return-Path: Delivered-To: apmail-hadoop-mapreduce-issues-archive@minotaur.apache.org Received: (qmail 47323 invoked from network); 23 Mar 2010 01:25:48 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 23 Mar 2010 01:25:48 -0000 Received: (qmail 2932 invoked by uid 500); 23 Mar 2010 01:25:48 -0000 Delivered-To: apmail-hadoop-mapreduce-issues-archive@hadoop.apache.org Received: (qmail 2900 invoked by uid 500); 23 Mar 2010 01:25:48 -0000 Mailing-List: contact mapreduce-issues-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: mapreduce-issues@hadoop.apache.org Delivered-To: mailing list mapreduce-issues@hadoop.apache.org Received: (qmail 2890 invoked by uid 99); 23 Mar 2010 01:25:48 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 23 Mar 2010 01:25:48 +0000 X-ASF-Spam-Status: No, hits=-1101.6 required=10.0 tests=ALL_TRUSTED,AWL X-Spam-Check-By: apache.org Received: from [140.211.11.140] (HELO brutus.apache.org) (140.211.11.140) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 23 Mar 2010 01:25:47 +0000 Received: from brutus.apache.org (localhost [127.0.0.1]) by brutus.apache.org (Postfix) with ESMTP id 49079234C4AF for ; Tue, 23 Mar 2010 01:25:27 +0000 (UTC) Message-ID: <711843689.423081269307527298.JavaMail.jira@brutus.apache.org> Date: Tue, 23 Mar 2010 01:25:27 +0000 (UTC) From: "Aaron Kimball (JIRA)" To: mapreduce-issues@hadoop.apache.org Subject: [jira] Updated: (MAPREDUCE-1489) DataDrivenDBInputFormat should not query the database when generating only one split In-Reply-To: <1789448629.247171266025047916.JavaMail.jira@brutus.apache.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/MAPREDUCE-1489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Aaron Kimball updated MAPREDUCE-1489: ------------------------------------- Status: Patch Available (was: Open) > DataDrivenDBInputFormat should not query the database when generating only one split > ------------------------------------------------------------------------------------ > > Key: MAPREDUCE-1489 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-1489 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Components: contrib/sqoop > Reporter: Aaron Kimball > Assignee: Aaron Kimball > Attachments: MAPREDUCE-1489.patch > > > DataDrivenDBInputFormat runs a query to establish bounding values for each split it generates; but if it's going to generate only one split (mapreduce.job.maps == 1), then there's no reason to do this. This will remove overhead associated with a single-threaded import of a non-indexed table since it avoids a full table scan. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.