From hdfs-dev-return-16220-apmail-hadoop-hdfs-dev-archive=hadoop.apache.org@hadoop.apache.org Mon Nov 10 01:45:52 2014 Return-Path: X-Original-To: apmail-hadoop-hdfs-dev-archive@minotaur.apache.org Delivered-To: apmail-hadoop-hdfs-dev-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 76969177D4 for ; Mon, 10 Nov 2014 01:45:52 +0000 (UTC) Received: (qmail 80539 invoked by uid 500); 10 Nov 2014 01:45:51 -0000 Delivered-To: apmail-hadoop-hdfs-dev-archive@hadoop.apache.org Received: (qmail 80440 invoked by uid 500); 10 Nov 2014 01:45:51 -0000 Mailing-List: contact hdfs-dev-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: hdfs-dev@hadoop.apache.org Delivered-To: mailing list hdfs-dev@hadoop.apache.org Received: (qmail 80429 invoked by uid 99); 10 Nov 2014 01:45:51 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 10 Nov 2014 01:45:51 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of hmai@hortonworks.com designates 209.85.213.180 as permitted sender) Received: from [209.85.213.180] (HELO mail-ig0-f180.google.com) (209.85.213.180) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 10 Nov 2014 01:45:25 +0000 Received: by mail-ig0-f180.google.com with SMTP id h3so8323977igd.7 for ; Sun, 09 Nov 2014 17:43:54 -0800 (PST) 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:date :message-id:subject:from:to:cc:content-type; bh=semUC50HmJqqLgh1ic+jFEf7WicQbcIIeLZlri0SrEo=; b=AlMq60FokPHBgBV7cGM2OvvuSdSGW4tyIoANctIexwLvf2KMtkUuW2dwIir1WhWTp3 ttSPqG3NpZau/QyMB4f/AD3NlavofeAqL/0r2c/yAKCVqouU7dqzMt1cjWCIn9TNjLa9 bYXcVETkiN+O/HkvwHQeHyYU9LTVnYLcw+kYkd54HUepPgcrhe14RdWRpYnpQU1la6zR nI6S9DsGn8hPUt6vLqJ4tC5DK9kDVt9UCAz/qMsrvjw0fsEYscHjFIOdi5GNzqj8jcH/ GkxCtEtAOmE+5+IJ/6MtAB22NaqkmleKaDQ5QbB+Itzc3H6zdir2JPKsXz9aTzhTusO4 gGuA== X-Gm-Message-State: ALoCoQnQbU+Y9hD/OLlMlQQGCZaZLvJWYf06o3q6eawa4m0OiRtl8yBhK3joboBkMAQLYd6PbWrtM35nFDXvUvXroofgFJ0zrWPhGgN37LOZdvF1Iw6ZJFi0G4uFEDLAjq4cm7bxCRVp MIME-Version: 1.0 X-Received: by 10.50.154.33 with SMTP id vl1mr21645539igb.48.1415583834320; Sun, 09 Nov 2014 17:43:54 -0800 (PST) Received: by 10.107.133.205 with HTTP; Sun, 9 Nov 2014 17:43:54 -0800 (PST) In-Reply-To: <55972FD0-71D1-4CAB-9237-57C300D6E6AB@hortonworks.com> References: <55972FD0-71D1-4CAB-9237-57C300D6E6AB@hortonworks.com> Date: Sun, 9 Nov 2014 17:43:54 -0800 Message-ID: Subject: Re: Guava From: Haohui Mai To: "common-dev@hadoop.apache.org" Cc: "hdfs-dev@hadoop.apache.org" , "yarn-dev@hadoop.apache.org" , "mapreduce-dev@hadoop.apache.org" Content-Type: multipart/alternative; boundary=047d7bd756b0984d3a0507774b36 X-Virus-Checked: Checked by ClamAV on apache.org --047d7bd756b0984d3a0507774b36 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Guava did make the lives of Hadoop development easier in many cases -- What I've been consistently hearing is that the version of Guava used is Hadoop is so old that it starts to hurt the application developers. I appreciate the value of Guava -- things like CacheMap are fairly difficult to implement efficiently and correctly. I think that creating separate client libraries for Hadoop can largely alleviate the problem -- obviously these libraries cannot use Guava, but it allows us to use Guava's help on the server side. For example, HDFS-6200 is one of the initiatives. Just my two cents. Regards, Haohui On Sun, Nov 9, 2014 at 4:42 PM, Arun C Murthy wrote: > =E2=80=A6 has been a constant pain w.r.t compatibility etc. > > Should we consider adopting a policy to not use guava in Common/HDFS/YARN= ? > > MR doesn't matter too much since it's application-side issue, it does hur= t > end-users though since they still might want a newer guava-version, but a= t > least they can modify MR. > > Thoughts? > > thanks, > Arun > > > -- > CONFIDENTIALITY NOTICE > NOTICE: This message is intended for the use of the individual or entity = to > which it is addressed and may contain information that is confidential, > privileged and exempt from disclosure under applicable law. If the reader > of this message is not the intended recipient, you are hereby notified th= at > any printing, copying, dissemination, distribution, disclosure or > forwarding of this communication is strictly prohibited. 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