Return-Path: X-Original-To: apmail-hive-dev-archive@www.apache.org Delivered-To: apmail-hive-dev-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 5247417635 for ; Tue, 7 Oct 2014 22:51:34 +0000 (UTC) Received: (qmail 60504 invoked by uid 500); 7 Oct 2014 22:51:33 -0000 Delivered-To: apmail-hive-dev-archive@hive.apache.org Received: (qmail 60432 invoked by uid 500); 7 Oct 2014 22:51:33 -0000 Mailing-List: contact dev-help@hive.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@hive.apache.org Delivered-To: mailing list dev@hive.apache.org Received: (qmail 60421 invoked by uid 500); 7 Oct 2014 22:51:33 -0000 Delivered-To: apmail-hadoop-hive-dev@hadoop.apache.org Received: (qmail 60418 invoked by uid 99); 7 Oct 2014 22:51:33 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 07 Oct 2014 22:51:33 +0000 Date: Tue, 7 Oct 2014 22:51:33 +0000 (UTC) From: "Prasanth J (JIRA)" To: hive-dev@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HIVE-7832) Do ORC dictionary check at a finer level and preserve encoding across stripes 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/HIVE-7832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14162730#comment-14162730 ] Prasanth J commented on HIVE-7832: ---------------------------------- [~leftylev] Added the new configuration to https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-ORCFileFormat > Do ORC dictionary check at a finer level and preserve encoding across stripes > ----------------------------------------------------------------------------- > > Key: HIVE-7832 > URL: https://issues.apache.org/jira/browse/HIVE-7832 > Project: Hive > Issue Type: Improvement > Affects Versions: 0.14.0 > Reporter: Prasanth J > Assignee: Prasanth J > Labels: TODOC14 > Fix For: 0.14.0 > > Attachments: HIVE-7832.1.patch, HIVE-7832.2.patch, HIVE-7832.3.patch, HIVE-7832.4.patch, HIVE-7832.5.patch, HIVE-7832.6.patch, HIVE-7832.7.patch, HIVE-7832.8.patch, HIVE-7832.9.patch > > > Currently ORC dictionary check happens while writing the stripe. Just before writing stripe if ratio of dictionary entries to total non-null rows is greater than threshold then the dictionary is discarded. Also, the decision of using dictionary or not is preserved across stripes. This sometimes leads to costly insertion cost of O(logn) for each stripes when there are too many distinct keys. -- This message was sent by Atlassian JIRA (v6.3.4#6332)