Return-Path: X-Original-To: apmail-hbase-issues-archive@www.apache.org Delivered-To: apmail-hbase-issues-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 7A528112C0 for ; Wed, 23 Jul 2014 18:57:42 +0000 (UTC) Received: (qmail 39309 invoked by uid 500); 23 Jul 2014 18:57:42 -0000 Delivered-To: apmail-hbase-issues-archive@hbase.apache.org Received: (qmail 39274 invoked by uid 500); 23 Jul 2014 18:57:42 -0000 Mailing-List: contact issues-help@hbase.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Delivered-To: mailing list issues@hbase.apache.org Received: (qmail 39231 invoked by uid 99); 23 Jul 2014 18:57:42 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 23 Jul 2014 18:57:42 +0000 Date: Wed, 23 Jul 2014 18:57:42 +0000 (UTC) From: "Jean-Marc Spaggiari (JIRA)" To: issues@hbase.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (HBASE-11562) CopyTable should provide an option to shuffle the mapper tasks 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/HBASE-11562?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jean-Marc Spaggiari updated HBASE-11562: ---------------------------------------- Attachment: HBASE-11562-v2-trunk.patch > CopyTable should provide an option to shuffle the mapper tasks > -------------------------------------------------------------- > > Key: HBASE-11562 > URL: https://issues.apache.org/jira/browse/HBASE-11562 > Project: HBase > Issue Type: Bug > Components: mapreduce > Affects Versions: 0.99.0, 0.94.20, 0.98.4 > Reporter: Jean-Marc Spaggiari > Assignee: Jean-Marc Spaggiari > Attachments: HBASE-11562-v0-trunk.patch, HBASE-11562-v2-trunk.patch > > > When doing a copy table from a table with a lot of regions to a table to way less regions, on a cluster with limited number of mappers, since map tasks are ordered by key, tasks will first run for the few first regions and will hotspot a single region server on the destination side. > To avoid this, we should submit the map tasks in a random order. > This JIRA is to add this option to CopyTable and TableInputFormat -- This message was sent by Atlassian JIRA (v6.2#6252)