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 A9A4AF9BC for ; Wed, 10 Apr 2013 17:12:19 +0000 (UTC) Received: (qmail 44784 invoked by uid 500); 10 Apr 2013 17:12:19 -0000 Delivered-To: apmail-hbase-issues-archive@hbase.apache.org Received: (qmail 44749 invoked by uid 500); 10 Apr 2013 17:12:19 -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 44679 invoked by uid 99); 10 Apr 2013 17:12:19 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 10 Apr 2013 17:12:19 +0000 Date: Wed, 10 Apr 2013 17:12:19 +0000 (UTC) From: "Ted Yu (JIRA)" To: issues@hbase.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Assigned] (HBASE-8316) JoinedHeap for non essential column families should reseek instead of seek 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-8316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Ted Yu reassigned HBASE-8316: ----------------------------- Assignee: Lars Hofhansl (was: Ted Yu) > JoinedHeap for non essential column families should reseek instead of seek > -------------------------------------------------------------------------- > > Key: HBASE-8316 > URL: https://issues.apache.org/jira/browse/HBASE-8316 > Project: HBase > Issue Type: Sub-task > Components: Filters, Performance, regionserver > Reporter: Lars Hofhansl > Assignee: Lars Hofhansl > Fix For: 0.98.0, 0.94.7, 0.95.1 > > Attachments: 8316-0.94.txt, 8316-trunk.txt, 8316-trunk.txt > > > This was raised by the Phoenix team. During a profiling session we noticed that catching the joinedHeap up to the current rows via seek causes a performance regression, which makes the joinedHeap only efficient when either a high or low percentage is matched by the filter. > (High is fine, because the joinedHeap will not get behind as often and does not need to be caught up, low is fine, because the seek isn't happening frequently). > In our tests we found that the solution is quite simple: Replace seek with reseek. Patch coming soon. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira