Return-Path: X-Original-To: apmail-hbase-issues-archive@www.apache.org Delivered-To: apmail-hbase-issues-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 6873217515 for ; Tue, 4 Nov 2014 23:11:37 +0000 (UTC) Received: (qmail 55844 invoked by uid 500); 4 Nov 2014 23:11:35 -0000 Delivered-To: apmail-hbase-issues-archive@hbase.apache.org Received: (qmail 55773 invoked by uid 500); 4 Nov 2014 23:11:35 -0000 Mailing-List: contact issues-help@hbase.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Delivered-To: mailing list issues@hbase.apache.org Received: (qmail 55760 invoked by uid 99); 4 Nov 2014 23:11:35 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 04 Nov 2014 23:11:35 +0000 Date: Tue, 4 Nov 2014 23:11:35 +0000 (UTC) From: "stack (JIRA)" To: issues@hbase.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HBASE-12219) Cache more efficiently getAll() and get() in FSTableDescriptors 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/HBASE-12219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14197081#comment-14197081 ] stack commented on HBASE-12219: ------------------------------- I applied HBASE-12219-0.99.v1.patch Lets see if branch-1 stays stable. If so, will apply 0.98. > Cache more efficiently getAll() and get() in FSTableDescriptors > --------------------------------------------------------------- > > Key: HBASE-12219 > URL: https://issues.apache.org/jira/browse/HBASE-12219 > Project: HBase > Issue Type: Bug > Components: master > Affects Versions: 0.94.24, 0.99.1, 0.98.6.1 > Reporter: Esteban Gutierrez > Assignee: Esteban Gutierrez > Labels: scalability > Fix For: 2.0.0, 0.98.8, 0.99.2 > > Attachments: HBASE-12219-0.98.patch, HBASE-12219-0.98.v1.addendum.patch, HBASE-12219-0.98.v1.patch, HBASE-12219-0.99.addendum.patch, HBASE-12219-0.99.patch, HBASE-12219-0.99.v1.patch, HBASE-12219-v1.patch, HBASE-12219-v1.patch, HBASE-12219.v0.txt, HBASE-12219.v2.patch, HBASE-12219.v3.patch, list.png > > > Currently table descriptors and tables are cached once they are accessed for the first time. Next calls to the master only require a trip to HDFS to lookup the modified time in order to reload the table descriptors if modified. However in clusters with a large number of tables or concurrent clients and this can be too aggressive to HDFS and the master causing contention to process other requests. A simple solution is to have a TTL based cached for FSTableDescriptors#getAll() and FSTableDescriptors#TableDescriptorAndModtime() that can allow the master to process those calls faster without causing contention without having to perform a trip to HDFS for every call. to listtables() or getTableDescriptor() -- This message was sent by Atlassian JIRA (v6.3.4#6332)