Return-Path: Delivered-To: apmail-hadoop-core-dev-archive@www.apache.org Received: (qmail 10607 invoked from network); 15 May 2008 06:30:23 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 15 May 2008 06:30:23 -0000 Received: (qmail 92159 invoked by uid 500); 15 May 2008 06:30:22 -0000 Delivered-To: apmail-hadoop-core-dev-archive@hadoop.apache.org Received: (qmail 92130 invoked by uid 500); 15 May 2008 06:30:22 -0000 Mailing-List: contact core-dev-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: core-dev@hadoop.apache.org Delivered-To: mailing list core-dev@hadoop.apache.org Received: (qmail 92118 invoked by uid 99); 15 May 2008 06:30:22 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 14 May 2008 23:30:22 -0700 X-ASF-Spam-Status: No, hits=-2000.0 required=10.0 tests=ALL_TRUSTED 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; Thu, 15 May 2008 06:29:35 +0000 Received: from brutus (localhost [127.0.0.1]) by brutus.apache.org (Postfix) with ESMTP id B5BD6234C11F for ; Wed, 14 May 2008 23:29:55 -0700 (PDT) Message-ID: <1175804606.1210832995743.JavaMail.jira@brutus> Date: Wed, 14 May 2008 23:29:55 -0700 (PDT) From: "Subramaniam Krishnan (JIRA)" To: core-dev@hadoop.apache.org Subject: [jira] Reopened: (HADOOP-3387) Custom Splitter for handling many small files In-Reply-To: <1100579783.1210750315788.JavaMail.jira@brutus> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Virus-Checked: Checked by ClamAV on apache.org [ https://issues.apache.org/jira/browse/HADOOP-3387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Subramaniam Krishnan reopened HADOOP-3387: ------------------------------------------ > Custom Splitter for handling many small files > --------------------------------------------- > > Key: HADOOP-3387 > URL: https://issues.apache.org/jira/browse/HADOOP-3387 > Project: Hadoop Core > Issue Type: Improvement > Components: mapred > Reporter: Subramaniam Krishnan > Assignee: Subramaniam Krishnan > Fix For: 0.18.0 > > > Hadoop by default allocates a Map to a file irrespective of size. This is not optimal if you have a large number of small files, for e.g:- If you 2000 100KB files, 2000 Maps will be allocated for the job. > The Custom Multi File Splitter collapses all the small files to a single split till the DFS Block Size is hit. > It also take care of handling big files by splitting them on Block Size and adding up all the reminders(if any) to a further splits of Block Size. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.