From issues-return-4494-archive-asf-public=cust-asf.ponee.io@phoenix.apache.org Tue Feb 5 22:40:04 2019 Return-Path: X-Original-To: archive-asf-public@cust-asf.ponee.io Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by mx-eu-01.ponee.io (Postfix) with SMTP id 89A3F180608 for ; Tue, 5 Feb 2019 23:40:03 +0100 (CET) Received: (qmail 60784 invoked by uid 500); 5 Feb 2019 22:40:02 -0000 Mailing-List: contact issues-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 issues@phoenix.apache.org Received: (qmail 60775 invoked by uid 99); 5 Feb 2019 22:40:02 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd3-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 05 Feb 2019 22:40:02 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd3-us-west.apache.org (ASF Mail Server at spamd3-us-west.apache.org) with ESMTP id 51B5D182BFC for ; Tue, 5 Feb 2019 22:40:02 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd3-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: -109.501 X-Spam-Level: X-Spam-Status: No, score=-109.501 tagged_above=-999 required=6.31 tests=[ENV_AND_HDR_SPF_MATCH=-0.5, KAM_ASCII_DIVIDERS=0.8, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, USER_IN_DEF_SPF_WL=-7.5, USER_IN_WHITELIST=-100] autolearn=disabled Received: from mx1-lw-us.apache.org ([10.40.0.8]) by localhost (spamd3-us-west.apache.org [10.40.0.10]) (amavisd-new, port 10024) with ESMTP id ygpnET9xXw8a for ; Tue, 5 Feb 2019 22:40:01 +0000 (UTC) Received: from mailrelay1-us-west.apache.org (mailrelay1-us-west.apache.org [209.188.14.139]) by mx1-lw-us.apache.org (ASF Mail Server at mx1-lw-us.apache.org) with ESMTP id D33B85FACC for ; Tue, 5 Feb 2019 22:40:00 +0000 (UTC) Received: from jira-lw-us.apache.org (unknown [207.244.88.139]) by mailrelay1-us-west.apache.org (ASF Mail Server at mailrelay1-us-west.apache.org) with ESMTP id 667B9E26FD for ; Tue, 5 Feb 2019 22:40:00 +0000 (UTC) Received: from jira-lw-us.apache.org (localhost [127.0.0.1]) by jira-lw-us.apache.org (ASF Mail Server at jira-lw-us.apache.org) with ESMTP id 112BA2441B for ; Tue, 5 Feb 2019 22:40:00 +0000 (UTC) Date: Tue, 5 Feb 2019 22:40:00 +0000 (UTC) From: "Lars Hofhansl (JIRA)" To: issues@phoenix.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (PHOENIX-5123) Avoid using MappedByteBuffers for server side GROUP BY 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/PHOENIX-5123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16761283#comment-16761283 ] Lars Hofhansl commented on PHOENIX-5123: ---------------------------------------- Well... Currently you can't read or write past the buffer, i.e. past the 4k. With my new code a writer writing more than 4k would corrupt the next page. (Pages are retrieved at offsets as multiples of 4k) > Avoid using MappedByteBuffers for server side GROUP BY > ------------------------------------------------------ > > Key: PHOENIX-5123 > URL: https://issues.apache.org/jira/browse/PHOENIX-5123 > Project: Phoenix > Issue Type: Bug > Reporter: Lars Hofhansl > Priority: Major > Attachments: 5123-4.x-W.I.P.txt > > > Like PHOENIX-5120 but for GROUP BY. > Solution is a bit more tricky, since outline for sorting the access here is truly random. > [~apurtell] suggests to perhaps just use a RandomAccessFile for this. > (I'm not sure that uses under the hood, though) -- This message was sent by Atlassian JIRA (v7.6.3#76005)