Return-Path: X-Original-To: apmail-hadoop-hdfs-user-archive@minotaur.apache.org Delivered-To: apmail-hadoop-hdfs-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 722D4DFA7 for ; Fri, 14 Sep 2012 06:04:27 +0000 (UTC) Received: (qmail 91786 invoked by uid 500); 14 Sep 2012 06:04:22 -0000 Delivered-To: apmail-hadoop-hdfs-user-archive@hadoop.apache.org Received: (qmail 91585 invoked by uid 500); 14 Sep 2012 06:04:22 -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 91560 invoked by uid 99); 14 Sep 2012 06:04:21 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 14 Sep 2012 06:04:21 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=FSL_RCVD_USER,HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of lin.yang.jason@gmail.com designates 209.85.220.176 as permitted sender) Received: from [209.85.220.176] (HELO mail-vc0-f176.google.com) (209.85.220.176) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 14 Sep 2012 06:04:13 +0000 Received: by vcbfl11 with SMTP id fl11so5778728vcb.35 for ; Thu, 13 Sep 2012 23:03:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:from:date:message-id:subject:to:content-type; bh=+HdGfHlDfiKWk9BKgUbQmtgJAuQISeSo8E6+I5b3bL4=; b=El+E/s10PR75JO5lMWlzAQYUBUqdedMbBsfunMnn4iPWbAUKPgkq4b9V90fmcjO7BI 5Hj1FYuuLTH+JRv5tUFOAA9WPZvT4kVhLS5+40FMcehRhgiccomn2FobHc0xcxK02wOo aJmV7DzwmU3WvI6u5jV/65TuKr8Fj81XdsnZbHiyNM5XPwJ672E77VEi8jW9yfT0jIyc Tc+hmaP4HOa3U65fKDsrT1iv9bSYnETKAluNbpYmSsS+RT2YFI/5+lpLaEMcfbIu6nch Z/TVgfEEPxENY+OC5rNy4Iyuhw1oEhajuXZ+ngvkC+2k6/oRiFFnt50CdjQopx+sIjjB j83Q== Received: by 10.58.12.231 with SMTP id b7mr1144574vec.28.1347602632939; Thu, 13 Sep 2012 23:03:52 -0700 (PDT) MIME-Version: 1.0 Received: by 10.58.132.176 with HTTP; Thu, 13 Sep 2012 23:03:32 -0700 (PDT) From: Jason Yang Date: Fri, 14 Sep 2012 14:03:32 +0800 Message-ID: Subject: What's the basic idea of pseudo-distributed Hadoop ? To: user@hadoop.apache.org Content-Type: multipart/alternative; boundary=047d7b41bf323c16a304c9a330d9 --047d7b41bf323c16a304c9a330d9 Content-Type: text/plain; charset=ISO-8859-1 Hi, all I have a question about how does the pseudo-distributed Hadoop cluster work: As many map tasks are submitted to the pseudo-distributed Hadoop cluster, does the hadoop run each mapper in sequence ? or does it run these mappers in different threads or something could be parallel? -- YANG, Lin --047d7b41bf323c16a304c9a330d9 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi, all

I have a question about how does the pseudo-dist= ributed Hadoop cluster work:

As many map tasks are= submitted to the pseudo-distributed Hadoop cluster, does the hadoop run ea= ch mapper in sequence ? or does it run these mappers in different threads o= r something could be parallel?

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YANG, Lin

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