Return-Path: X-Original-To: archive-asf-public-internal@cust-asf2.ponee.io Delivered-To: archive-asf-public-internal@cust-asf2.ponee.io Received: from cust-asf.ponee.io (cust-asf.ponee.io [163.172.22.183]) by cust-asf2.ponee.io (Postfix) with ESMTP id 5A913200B0F for ; Fri, 17 Jun 2016 20:58:53 +0200 (CEST) Received: by cust-asf.ponee.io (Postfix) id 59088160A61; Fri, 17 Jun 2016 18:58:53 +0000 (UTC) Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by cust-asf.ponee.io (Postfix) with SMTP id A42BE160A4C for ; Fri, 17 Jun 2016 20:58:52 +0200 (CEST) Received: (qmail 28330 invoked by uid 500); 17 Jun 2016 18:58:46 -0000 Mailing-List: contact dev-help@arrow.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@arrow.apache.org Delivered-To: mailing list dev@arrow.apache.org Received: (qmail 28318 invoked by uid 99); 17 Jun 2016 18:58:46 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd1-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 17 Jun 2016 18:58:46 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd1-us-west.apache.org (ASF Mail Server at spamd1-us-west.apache.org) with ESMTP id 09FD5C25F3 for ; Fri, 17 Jun 2016 18:58:46 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd1-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: -0.802 X-Spam-Level: X-Spam-Status: No, score=-0.802 tagged_above=-999 required=6.31 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001] autolearn=disabled Authentication-Results: spamd1-us-west.apache.org (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mx2-lw-eu.apache.org ([10.40.0.8]) by localhost (spamd1-us-west.apache.org [10.40.0.7]) (amavisd-new, port 10024) with ESMTP id Zv5qtfjco5Vr for ; Fri, 17 Jun 2016 18:58:43 +0000 (UTC) Received: from mail-io0-f172.google.com (mail-io0-f172.google.com [209.85.223.172]) by mx2-lw-eu.apache.org (ASF Mail Server at mx2-lw-eu.apache.org) with ESMTPS id 2B8DB5F3A1 for ; Fri, 17 Jun 2016 18:58:43 +0000 (UTC) Received: by mail-io0-f172.google.com with SMTP id n127so85110887iof.3 for ; Fri, 17 Jun 2016 11:58:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=7iUf0J3pG0D4lDe2r5VrgAUeJPW+zt/Zh0LL4kOEiwE=; b=Y6dcSKiYolKf17Mlr0038l/9qvZ85VIfEt12sF8qw0nI0U2Xh+ArPmaDjQiGZc803H G3YkvJVJsDi7GU1dHvzZJJT2lTQkUyqGeVsp0NB1nFYkKsB/qEbgZ1Sl9ophBGtDp/q9 aeB7nK5Ewk7eJG3liY4gOmT4W1lsdMVtsvxHf4vzFWTAljCYioJhnNvGhn8HcxGnJOm6 ErbPnHR5EobHZ3vgiNH1aWqV8HDrWxmavuT+WVBaaMabCMYETM/pAFPjsnQvnYMHhwzx 6wsCHFCHCrr/8bDlYJHd5YueGoJlKNRudvFN5OifznSU368cLlbvAcS76B2m5eK970Pm fEQw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=7iUf0J3pG0D4lDe2r5VrgAUeJPW+zt/Zh0LL4kOEiwE=; b=fX46fEvcS49WTng87v0frwdaQWBwvCZIzyIh84SIG+8hdEqiuC6FhrWn3OTMksyukR AyCSEKueCfz+NaaqDhxEbQZnDdMVW/XaPuR1fNZNGVtp/TmCfTo2nAPvUUhpiGWj1Elh VtTjx/7LNaDbp6cR03Fh6skicn13Gnt3IGOxIb0EIAWhq/tuhLmOLvzXzEXC1LSgqrRE G2Lo19SkBOevfZZU9zp5h9q+rUof1hmjwvaVgCyio/k+sDcvcKSxUD/yZFxhJahBQXvf 963Eazvm7NUgceN6yykQod6VY8yZcFp/ErPvpGk8SBTsoV+0+MB1eZa7LXzLO5Fh5Urp eRpQ== X-Gm-Message-State: ALyK8tJiN0f9ASiJGrWLYY31MOU9CyC/U+WD5Vky56Y8yDBD854cKtjqByNSYRrVNGXI4/PkOwUIfr6XS4+Mzg== X-Received: by 10.107.32.148 with SMTP id g142mr5510342iog.117.1466189921979; Fri, 17 Jun 2016 11:58:41 -0700 (PDT) MIME-Version: 1.0 Received: by 10.36.142.68 with HTTP; Fri, 17 Jun 2016 11:58:02 -0700 (PDT) In-Reply-To: References: From: Wes McKinney Date: Fri, 17 Jun 2016 11:58:02 -0700 Message-ID: Subject: Re: Questions about Arrow To: dev@arrow.apache.org Content-Type: text/plain; charset=UTF-8 archived-at: Fri, 17 Jun 2016 18:58:53 -0000 hi Pei, Thanks for your interest in the project! Alluxio (fka Tachyon) is a complementary technology, so it would be interesting to see the two projects working well together. On Fri, Jun 17, 2016 at 10:02 AM, Pei Sun wrote: > Dear Arrow developers, > This is Pei from Alluxio Inc. I am interested in knowing more about > Arrow. I have several questions: > 1. If I want to try it out, is there an instruction? There is not, but you can start with the C++ and Java codebases on GitHub. > 2. How is the columnar format achieved in Arrow? After reading this format > , my feeling > is that it is achieved by the way you represent struct in memory. The > format is a little hard to follow. It will be helpful if you can answer > this question before I read it again and again :) Please see slides 11-14 and 19-22 in our presentation from March, and let me know if it is still unclear: http://www.slideshare.net/wesm/apache-arrow-stratahadoop-world-san-jose-2016-60349194 Two main purposes of the columnar layout is both to facilitate CPU cache- and SIMD-friendly analytics as well as to relocate data structures without performing serialization or some other data structure conversion. Thanks, Wes > > > Thanks a lot! Look forward to trying out this interesting project. > > -- > Pei Sun