Return-Path: X-Original-To: archive-asf-public-internal@cust-asf2.ponee.io Delivered-To: archive-asf-public-internal@cust-asf2.ponee.io Received: from cust-asf.ponee.io (cust-asf.ponee.io [163.172.22.183]) by cust-asf2.ponee.io (Postfix) with ESMTP id 92704200AF6 for ; Sat, 28 May 2016 02:34:17 +0200 (CEST) Received: by cust-asf.ponee.io (Postfix) id 9165A160A37; Sat, 28 May 2016 00:34:17 +0000 (UTC) Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by cust-asf.ponee.io (Postfix) with SMTP id DA7B9160A12 for ; Sat, 28 May 2016 02:34:16 +0200 (CEST) Received: (qmail 74192 invoked by uid 500); 28 May 2016 00:34:16 -0000 Mailing-List: contact dev-help@phoenix.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@phoenix.apache.org Delivered-To: mailing list dev@phoenix.apache.org Received: (qmail 74181 invoked by uid 99); 28 May 2016 00:34:16 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd1-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 28 May 2016 00:34:16 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd1-us-west.apache.org (ASF Mail Server at spamd1-us-west.apache.org) with ESMTP id A17F6C374F for ; Sat, 28 May 2016 00:34:15 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd1-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: -4.646 X-Spam-Level: X-Spam-Status: No, score=-4.646 tagged_above=-999 required=6.31 tests=[KAM_ASCII_DIVIDERS=0.8, KAM_LAZY_DOMAIN_SECURITY=1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-1.426] autolearn=disabled Received: from mx2-lw-eu.apache.org ([10.40.0.8]) by localhost (spamd1-us-west.apache.org [10.40.0.7]) (amavisd-new, port 10024) with ESMTP id o0EAUc1b9y7u for ; Sat, 28 May 2016 00:34:14 +0000 (UTC) Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by mx2-lw-eu.apache.org (ASF Mail Server at mx2-lw-eu.apache.org) with SMTP id E19E25F235 for ; Sat, 28 May 2016 00:34:13 +0000 (UTC) Received: (qmail 73937 invoked by uid 99); 28 May 2016 00:34:13 -0000 Received: from arcas.apache.org (HELO arcas) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 28 May 2016 00:34:13 +0000 Received: from arcas.apache.org (localhost [127.0.0.1]) by arcas (Postfix) with ESMTP id E1C092C033A for ; Sat, 28 May 2016 00:34:12 +0000 (UTC) Date: Sat, 28 May 2016 00:34:12 +0000 (UTC) From: "Samarth Jain (JIRA)" To: dev@phoenix.incubator.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (PHOENIX-2943) Performance of parallel order by query is > 30X slower than serial execution MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 archived-at: Sat, 28 May 2016 00:34:17 -0000 [ https://issues.apache.org/jira/browse/PHOENIX-2943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15305043#comment-15305043 ] Samarth Jain commented on PHOENIX-2943: --------------------------------------- [~mujtabachohan] - does it make a difference if stats aren't available? Makes me think it would be nice to have a NO_STATS hint which would make testing things like these much easier. It would also provide another performance comparison tool in our arsenal including SERIAL and NO_CACHE. > Performance of parallel order by query is > 30X slower than serial execution > ---------------------------------------------------------------------------- > > Key: PHOENIX-2943 > URL: https://issues.apache.org/jira/browse/PHOENIX-2943 > Project: Phoenix > Issue Type: Bug > Reporter: Mujtaba Chohan > Fix For: 4.8.0 > > > {code} > select /*+SERIAL*/ L_DISCOUNT, L_QUANTITY from lineitem_encoded order by (l_discount,L_QUANTITY) limit 1; > +-------------+-------------+ > | L_DISCOUNT | L_QUANTITY | > +-------------+-------------+ > | 0.04 | 17 | > +-------------+-------------+ > 1 row selected (0.129 seconds) > select L_DISCOUNT, L_QUANTITY from lineitem_encoded order by (l_discount,L_QUANTITY) limit 1; > +-------------+-------------+ > | L_DISCOUNT | L_QUANTITY | > +-------------+-------------+ > | 0.04 | 17 | > +-------------+-------------+ > 1 row selected (4.63 seconds) > explain select /*+SERIAL*/ L_DISCOUNT, L_QUANTITY from lineitem_encoded order by (l_discount,L_QUANTITY) limit 1; > +------------------------------------------------------------------------------------------------+ > | PLAN | > +------------------------------------------------------------------------------------------------+ > | CLIENT 417-CHUNK 5978838 ROWS 4150009682 BYTES SERIAL 417-WAY FULL SCAN OVER LINEITEM_ENCODED | > | SERVER TOP 1 ROW SORTED BY [(L_DISCOUNT, L_QUANTITY)] | > | CLIENT MERGE SORT | > +------------------------------------------------------------------------------------------------+ > 3 rows selected (0.016 seconds) > 0: jdbc:phoenix:localhost> explain select L_DISCOUNT, L_QUANTITY from lineitem_encoded order by (l_discount,L_QUANTITY) limit 1; > +--------------------------------------------------------------------------------------------------+ > | PLAN | > +--------------------------------------------------------------------------------------------------+ > | CLIENT 417-CHUNK 5978838 ROWS 4150009682 BYTES PARALLEL 417-WAY FULL SCAN OVER LINEITEM_ENCODED | > | SERVER TOP 1 ROW SORTED BY [(L_DISCOUNT, L_QUANTITY)] | > | CLIENT MERGE SORT | > +--------------------------------------------------------------------------------------------------+ > 3 rows selected (0.015 seconds) > {code} > Profiler information on this to be added soon. -- This message was sent by Atlassian JIRA (v6.3.4#6332)