Return-Path: X-Original-To: apmail-accumulo-user-archive@www.apache.org Delivered-To: apmail-accumulo-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 325FED3C1 for ; Wed, 26 Sep 2012 13:47:23 +0000 (UTC) Received: (qmail 24244 invoked by uid 500); 26 Sep 2012 13:47:23 -0000 Delivered-To: apmail-accumulo-user-archive@accumulo.apache.org Received: (qmail 23674 invoked by uid 500); 26 Sep 2012 13:47:19 -0000 Mailing-List: contact user-help@accumulo.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@accumulo.apache.org Delivered-To: mailing list user@accumulo.apache.org Received: (qmail 23631 invoked by uid 99); 26 Sep 2012 13:47:17 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 26 Sep 2012 13:47:17 +0000 X-ASF-Spam-Status: No, hits=-0.7 required=5.0 tests=FSL_RCVD_USER,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of eric.newton@gmail.com designates 209.85.223.169 as permitted sender) Received: from [209.85.223.169] (HELO mail-ie0-f169.google.com) (209.85.223.169) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 26 Sep 2012 13:47:11 +0000 Received: by ied10 with SMTP id 10so1655366ied.0 for ; Wed, 26 Sep 2012 06:46:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=35bUTTVssSivAoLV2/yISuOU/nTDej9nTuPXbOITE54=; b=MJZHiuQyYBM/6dYZhjAuoZ8mN8LIay0sX3/k+8dXVo6rhXl2HeCDQBb1P46dOPR4JP ADDlhd9se83OMjIGIkZmpFYF5S4XJmxa+BBzFWHPkvau8fQFDEOVT92ofM5Ulcav/8VJ lGpxh7gjrmVRGsXwIitRkprbYWnru97IsQopwaSZ9h74gtBg7CtdNRMwnv4cZ/sckr/J x+7uMnUiSbqmJGbL8Ia3kjGLfFycch2N1S3W03zdhPtN7RwffcN5ixHvfB1CtybpeXsI 7GDe/c1AaXZuxSLhvhdxOTtitSEw3pWH+9WR719UKqhrhcUMmUmbjVgHn2SmCJznEO5B ZHOw== MIME-Version: 1.0 Received: by 10.50.41.164 with SMTP id g4mr447260igl.71.1348667210457; Wed, 26 Sep 2012 06:46:50 -0700 (PDT) Received: by 10.50.25.66 with HTTP; Wed, 26 Sep 2012 06:46:50 -0700 (PDT) In-Reply-To: References: Date: Wed, 26 Sep 2012 09:46:50 -0400 Message-ID: Subject: Re: Accumulo Between Two Centers (DR - disaster recovery) From: Eric Newton To: user@accumulo.apache.org Content-Type: text/plain; charset=ISO-8859-1 X-Virus-Checked: Checked by ClamAV on apache.org I think you're talking about 2 different things. Accumulo is architected to run on fast connections. If you add one slowly connected computer, generally speaking, it will make everything run slowly. Replication is typically used to send copies from one data center to another, so that each has a local copy. Typically, the trick uses extra latency in updates to the copies to compensate for the relatively slow connections between data centers. Accumulo does not presently support replication. See ACCUMULO-378. -Eric On Wed, Sep 26, 2012 at 8:08 AM, Christopher Tubbs wrote: > I believe Accumulo can work across data centers, if the underlying DFS > span data centers. I also believe the latency tolerance is > configurable, and matters for servers holding locks in Zookeeper and > heartbeat messages to the Master. I'm not sure what the defaults for > these are, though. > > On Wed, Sep 26, 2012 at 8:00 AM, David Medinets > wrote: >> I recall a conversation in which people were pointed to Cassandra for >> its ability to replicate between data centers. I have forgotten what >> Accumulo offers on this topic. And does latency matter? If latency >> matters, what is the highest acceptable latency?