Return-Path: X-Original-To: apmail-hadoop-mapreduce-user-archive@minotaur.apache.org Delivered-To: apmail-hadoop-mapreduce-user-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 8E76BD578 for ; Tue, 18 Dec 2012 20:57:06 +0000 (UTC) Received: (qmail 38226 invoked by uid 500); 18 Dec 2012 20:57:02 -0000 Delivered-To: apmail-hadoop-mapreduce-user-archive@hadoop.apache.org Received: (qmail 38126 invoked by uid 500); 18 Dec 2012 20:57:01 -0000 Mailing-List: contact user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@hadoop.apache.org Delivered-To: mailing list user@hadoop.apache.org Received: (qmail 38116 invoked by uid 99); 18 Dec 2012 20:57:01 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 18 Dec 2012 20:57:01 +0000 X-ASF-Spam-Status: No, hits=1.7 required=5.0 tests=FREEMAIL_ENVFROM_END_DIGIT,HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of jayunit100@gmail.com designates 209.85.212.53 as permitted sender) Received: from [209.85.212.53] (HELO mail-vb0-f53.google.com) (209.85.212.53) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 18 Dec 2012 20:56:56 +0000 Received: by mail-vb0-f53.google.com with SMTP id b23so1435705vbz.40 for ; Tue, 18 Dec 2012 12:56:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=Iv5XqMA82djFEH47ja8r+k8t+pa0mJGAgEf8dPOPZrs=; b=FgG/A56vwZ0P5YLUm8/lh0DlshPe/8q0RKO190i39GYAVJIh9x8KmLm+bAHrzoNO9m aO1Q2ugyMA/u3bo77SZSlQgfs6Dpi9SCpuwdibpAMV2CQkl30kEd60V+02UdAploZHlt H7D0Mk355BerVhLl4h77sDc61o15bBSLmoCFVDGR0pw9hG6uhfd/6Nt2Y4TnYXfyEcIv D9IN1FG5TF1xbh27IvMnLKVfSOz7gQORtfF1tVyzyr6Z4T/wH7XRDAqHw/hJPxV1o/tz AxLothyR3SzG26Ss4hvFoJWsBGP6++5KlIBh8VJrk3yZoEtIXOoRyf89ppRHqddAZgfV 6GEg== MIME-Version: 1.0 Received: by 10.52.177.103 with SMTP id cp7mr4543318vdc.113.1355864195190; Tue, 18 Dec 2012 12:56:35 -0800 (PST) Received: by 10.58.46.68 with HTTP; Tue, 18 Dec 2012 12:56:35 -0800 (PST) Date: Tue, 18 Dec 2012 15:56:35 -0500 Message-ID: Subject: datanode write forwarding From: Jay Vyas To: "common-user@hadoop.apache.org" Content-Type: multipart/alternative; boundary=20cf3071cf30b7d0f504d126bbc6 X-Virus-Checked: Checked by ClamAV on apache.org --20cf3071cf30b7d0f504d126bbc6 Content-Type: text/plain; charset=ISO-8859-1 Hi : Do data nodes, when they receive write requests, forward the request to the next datanode in the chain after appending to a file? Or rather, do the write and forward asynchronously and at the same time? -- Jay Vyas http://jayunit100.blogspot.com --20cf3071cf30b7d0f504d126bbc6 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Hi :

Do data nodes, when they receive w= rite requests, forward the request to the next datanode in the chain after= appending to a file? Or rather, do the write and forward asynchronously an= d at the same time?
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