Return-Path: X-Original-To: apmail-hadoop-common-user-archive@www.apache.org Delivered-To: apmail-hadoop-common-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 00A4D9452 for ; Thu, 29 Sep 2011 17:39:59 +0000 (UTC) Received: (qmail 72380 invoked by uid 500); 29 Sep 2011 17:39:56 -0000 Delivered-To: apmail-hadoop-common-user-archive@hadoop.apache.org Received: (qmail 72341 invoked by uid 500); 29 Sep 2011 17:39:56 -0000 Mailing-List: contact common-user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: common-user@hadoop.apache.org Delivered-To: mailing list common-user@hadoop.apache.org Received: (qmail 72332 invoked by uid 99); 29 Sep 2011 17:39:56 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 29 Sep 2011 17:39:56 +0000 X-ASF-Spam-Status: No, hits=2.2 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of lessonz@q.com designates 205.169.121.111 as permitted sender) Received: from [205.169.121.111] (HELO smtp.q.com) (205.169.121.111) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 29 Sep 2011 17:39:48 +0000 X_CMAE_Category: 0,0 Undefined,Undefined X-CNFS-Analysis: v=1.1 cv=Seq0B0CiE5CbxA+gZH9gke2tpQMdeHytIgplYSYLmmc= c=1 sm=0 a=5uzyEDg2IGAA:10 a=dR0fgKqAu26VC3ja5d0A:9 a=wPNLvfGTeEIA:10 a=8ojJce9GCSHr2utyayQA:9 a=hOwYqf/ahnf9P1QP9FLl2g==:117 X-CM-Score: 0 X-Scanned-by: Cloudmark Authority Engine Authentication-Results: smtp03.quartz.synacor.com header.from=lessonz@q.com; sender-id=softfail Authentication-Results: smtp03.quartz.synacor.com smtp.mail=lessonz@q.com; spf=softfail; sender-id=softfail Authentication-Results: smtp03.quartz.synacor.com smtp.user=lessonz@q.com; auth=pass (LOGIN) Authentication-Results: smtp03.quartz.synacor.com x-tls.subject="/C=US/ST=California/L=Mountain View/O=Google Inc/CN=smtp.gmail.com"; auth=fail (cipher=RC4-SHA) Received-SPF: softfail (smtp03.quartz.synacor.com: transitional domain q.com does not designate 74.125.82.48 as permitted sender) Received: from [74.125.82.48] ([74.125.82.48:57630] helo=mail-ww0-f48.google.com) by smtp.q.com (envelope-from ) (ecelerity 2.2.2.40 r(29895/29896)) with ESMTPSA (cipher=RC4-SHA subject="/C=US/ST=California/L=Mountain View/O=Google Inc/CN=smtp.gmail.com") id DC/21-29974-F4DA48E4; Thu, 29 Sep 2011 13:39:27 -0400 Received: by wwe32 with SMTP id 32so1400872wwe.29 for ; Thu, 29 Sep 2011 10:39:25 -0700 (PDT) MIME-Version: 1.0 Received: by 10.216.220.162 with SMTP id o34mr4101704wep.70.1317317965465; Thu, 29 Sep 2011 10:39:25 -0700 (PDT) Received: by 10.216.70.68 with HTTP; Thu, 29 Sep 2011 10:39:25 -0700 (PDT) Date: Thu, 29 Sep 2011 11:39:25 -0600 Message-ID: Subject: Block Size From: lessonz To: common-user Content-Type: multipart/alternative; boundary=0016e65a06c66347e804ae17fd70 --0016e65a06c66347e804ae17fd70 Content-Type: text/plain; charset=ISO-8859-1 I'm new to Hadoop, and I'm trying to understand the implications of a 64M block size in the HDFS. Is there a good reference that enumerates the implications of this decision and its effects on files stored in the system as well as map-reduce jobs? Thanks. --0016e65a06c66347e804ae17fd70--