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 4F4DD11E93 for ; Wed, 10 Sep 2014 19:11:35 +0000 (UTC) Received: (qmail 47207 invoked by uid 500); 10 Sep 2014 19:11:34 -0000 Delivered-To: apmail-hive-dev-archive@hive.apache.org Received: (qmail 47096 invoked by uid 500); 10 Sep 2014 19:11:34 -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 46905 invoked by uid 500); 10 Sep 2014 19:11:34 -0000 Delivered-To: apmail-hadoop-hive-dev@hadoop.apache.org Received: (qmail 46864 invoked by uid 99); 10 Sep 2014 19:11:34 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 10 Sep 2014 19:11:34 +0000 Date: Wed, 10 Sep 2014 19:11:34 +0000 (UTC) From: "Prasanth J (JIRA)" To: hive-dev@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (HIVE-7859) Tune zlib compression in ORC to account for the encoding strategy 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-7859?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Prasanth J updated HIVE-7859: ----------------------------- Status: Patch Available (was: Open) > Tune zlib compression in ORC to account for the encoding strategy > ----------------------------------------------------------------- > > Key: HIVE-7859 > URL: https://issues.apache.org/jira/browse/HIVE-7859 > Project: Hive > Issue Type: Bug > Components: File Formats > Reporter: Gopal V > Assignee: Gopal V > Attachments: HIVE-7859.1.patch, HIVE-7859.2.patch > > > Currently ORC Zlib is slow because several compression strategies ZLib uses is already done by ORC in itself (dictionary, RLE, bit-packing). > We need to pick between Z_FILTERED, Z_HUFFMAN_ONLY, Z_RLE, Z_FIXED and Z_DEFAULT_STRATEGY according to column stream type. > For instance an RLE_V2 stream could a use Z_FILTERED compression without invoking the rest of the strategies. > The string streams can use Z_FIXED compression strategies and so on. > The core limitation to stick to retain compatibility with the default decompressor, so that these are automatically backward compatible. -- This message was sent by Atlassian JIRA (v6.3.4#6332)