Return-Path: Delivered-To: apmail-hadoop-general-archive@minotaur.apache.org Received: (qmail 98799 invoked from network); 29 Nov 2010 19:57:05 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 29 Nov 2010 19:57:05 -0000 Received: (qmail 74538 invoked by uid 500); 29 Nov 2010 19:57:03 -0000 Delivered-To: apmail-hadoop-general-archive@hadoop.apache.org Received: (qmail 74484 invoked by uid 500); 29 Nov 2010 19:57:03 -0000 Mailing-List: contact general-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: general@hadoop.apache.org Delivered-To: mailing list general@hadoop.apache.org Received: (qmail 74476 invoked by uid 99); 29 Nov 2010 19:57:03 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 29 Nov 2010 19:57:03 +0000 X-ASF-Spam-Status: No, hits=2.2 required=10.0 tests=FREEMAIL_FROM,HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_PASS,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of b.aravinth@gmail.com designates 74.125.82.176 as permitted sender) Received: from [74.125.82.176] (HELO mail-wy0-f176.google.com) (74.125.82.176) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 29 Nov 2010 19:56:56 +0000 Received: by wyf28 with SMTP id 28so5188916wyf.35 for ; Mon, 29 Nov 2010 11:56:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:date:message-id :subject:from:to:content-type; bh=9aGaNugrxXnUiLLGYYiRhJU5JO7cbV+fluD97iyYDEw=; b=YAu0vDBYo0SX1XrH1UruMAy9oGLOd6m3jtC3nPUnQiKWLvoMNM1tnSSaI1okp8h+dV 5WIIn/+2cBQNZnUdwEjYqGDfWjtL0Pb+02BVtIwDAHgtWw7V403VZM+Iul/ArBei9H6e iihcUY7NNdvkhIreiZgES3wfKAfmfVbsIK2qI= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=JndS3eEszbKtLqhGnFyaZoyrLNHKlxzYG3imawk91WhM252knzD/DFB68qrHMHV9nC ix+jUd4ZJdnacdzx5yOHw1yFNevQk/thF+NBurn/FoNP1hdfcGeGjBpfykl9UQiSrVfD TVH6e4c7FTaP6MLdEWQqsKDhnkadaLw7r/3Wc= MIME-Version: 1.0 Received: by 10.216.164.194 with SMTP id c44mr5808443wel.107.1291060595574; Mon, 29 Nov 2010 11:56:35 -0800 (PST) Received: by 10.216.86.203 with HTTP; Mon, 29 Nov 2010 11:56:35 -0800 (PST) Date: Mon, 29 Nov 2010 14:56:35 -0500 Message-ID: Subject: Image as input to M-R in Hadoop From: Aravinth Bheemaraj To: general@hadoop.apache.org Content-Type: multipart/alternative; boundary=0016364267352ecf810496367818 X-Virus-Checked: Checked by ClamAV on apache.org --0016364267352ecf810496367818 Content-Type: text/plain; charset=ISO-8859-1 Hi, I am a beginner to Hadoop and I am looking for some help in implementing the Mapper with an image as input. Is there any predefined Writable class for processing image? If so, how do I use it? Also I have read somewhere that compressed formats cannot be processed in Hadoop. If this is true, am I making any sense in saying that the JPEG images (which are also compressed format) cannot be processed by Hadoop? Please correct me if I have misunderstood this concept. Thanks, -- Aravinth --0016364267352ecf810496367818--