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 43948D1C3 for ; Wed, 26 Sep 2012 12:36:02 +0000 (UTC) Received: (qmail 85785 invoked by uid 500); 26 Sep 2012 12:09:39 -0000 Delivered-To: apmail-accumulo-user-archive@accumulo.apache.org Received: (qmail 85692 invoked by uid 500); 26 Sep 2012 12:09:35 -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 85503 invoked by uid 99); 26 Sep 2012 12:09:26 -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 12:09:26 +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 ctubbsii@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 12:09:16 +0000 Received: by ied10 with SMTP id 10so1329905ied.0 for ; Wed, 26 Sep 2012 05:08:56 -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=b62Tr/8vHxRv47Jouo3Ft9Mc1/iuMs18yqBz+6xeMAU=; b=FEO5u2+sGcz+ibxkua7RySJo2BP8o+lxLfHlg5qJi7iQssY3v+T7SCxY+607wLjsn+ aFM1PmlIz9gCIGeYoGfZEG5IMmbLMMGslEeezLMGtXXkeP2DynT9rt+F7mOIKlrcMKqU VOE+ptoSjY3tzipqrIa5aJHZulHQETvpP2o0tHqDSrzrBBMGqGhyXRMyhZBqtQbrrE6Y h0fn7B6Lqy00EpZPm4CIGcDpV37QY5TD2zeJS6a2FTyWq7Lr6HOxsU5Ds3Z66s4xRhZr 2LjwKzq5aMNYxhUaq8UaZjTCF26eSj6PhG+OcZv2sUbsmHbkcY2fck78HwH1vedblvLC qWqw== MIME-Version: 1.0 Received: by 10.50.214.65 with SMTP id ny1mr294593igc.10.1348661335852; Wed, 26 Sep 2012 05:08:55 -0700 (PDT) Received: by 10.64.61.70 with HTTP; Wed, 26 Sep 2012 05:08:55 -0700 (PDT) In-Reply-To: References: Date: Wed, 26 Sep 2012 08:08:55 -0400 Message-ID: Subject: Re: Accumulo Between Two Centers (DR - disaster recovery) From: Christopher Tubbs To: user@accumulo.apache.org Content-Type: text/plain; charset=ISO-8859-1 X-Virus-Checked: Checked by ClamAV on apache.org 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?