Return-Path: X-Original-To: apmail-accumulo-notifications-archive@minotaur.apache.org Delivered-To: apmail-accumulo-notifications-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 1BF3117404 for ; Wed, 14 Jan 2015 05:19:34 +0000 (UTC) Received: (qmail 1299 invoked by uid 500); 14 Jan 2015 05:19:35 -0000 Delivered-To: apmail-accumulo-notifications-archive@accumulo.apache.org Received: (qmail 1259 invoked by uid 500); 14 Jan 2015 05:19:35 -0000 Mailing-List: contact notifications-help@accumulo.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: jira@apache.org Delivered-To: mailing list notifications@accumulo.apache.org Received: (qmail 1247 invoked by uid 99); 14 Jan 2015 05:19:35 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 14 Jan 2015 05:19:35 +0000 Date: Wed, 14 Jan 2015 05:19:35 +0000 (UTC) From: "Denis Petrov (JIRA)" To: notifications@accumulo.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (ACCUMULO-3471) Adding a new tserver puts some tables offline for few minutes MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/ACCUMULO-3471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14276494#comment-14276494 ] Denis Petrov commented on ACCUMULO-3471: ---------------------------------------- On the small cluster (which is not used in production and available for experiments) I see similar reassignment and startup speed of 10 tablets/sec. I added some timings in the tserver's code (version 1.6.1). The bottleneck is in MetaDataStateStore.setLocations() executed on each loaded tablet. It takes 50-200ms. I will investigate it further. > Adding a new tserver puts some tables offline for few minutes > ------------------------------------------------------------- > > Key: ACCUMULO-3471 > URL: https://issues.apache.org/jira/browse/ACCUMULO-3471 > Project: Accumulo > Issue Type: Bug > Components: tserver > Affects Versions: 1.6.1 > Environment: Ubuntu 12.04 > Reporter: Denis Petrov > Fix For: 1.6.2, 1.7.0 > > Attachments: ACCUMULO-3471-balance-test.patch > > > I run an Accumulo cluster with 15 tservers with about 6000 tablets on each (disks are quite slow - each node has 2*4Tb SATA) > When a new tserver added to the cluster, the rebalancing procedure starts. > During this procedure some tablets are offline and unreachable during 5-10 minutes. > It is visible in http://monitor:50095/tables and by timeouts on client side. > The rebalancing caused by killing a tserver converges much faster then rebalancing caused by adding a tserver. -- This message was sent by Atlassian JIRA (v6.3.4#6332)