From issues-return-20021-archive-asf-public=cust-asf.ponee.io@kylin.apache.org Tue Sep 18 18:26:04 2018 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 10BBF180677 for ; Tue, 18 Sep 2018 18:26:03 +0200 (CEST) Received: (qmail 15050 invoked by uid 500); 18 Sep 2018 16:26:03 -0000 Mailing-List: contact issues-help@kylin.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@kylin.apache.org Delivered-To: mailing list issues@kylin.apache.org Received: (qmail 15039 invoked by uid 99); 18 Sep 2018 16:26:03 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd2-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 18 Sep 2018 16:26:03 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd2-us-west.apache.org (ASF Mail Server at spamd2-us-west.apache.org) with ESMTP id 9AFCC1A2F90 for ; Tue, 18 Sep 2018 16:26:02 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd2-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-eu.apache.org ([10.40.0.8]) by localhost (spamd2-us-west.apache.org [10.40.0.9]) (amavisd-new, port 10024) with ESMTP id spz-TBaUqVdT for ; Tue, 18 Sep 2018 16:26:01 +0000 (UTC) Received: from mailrelay1-us-west.apache.org (mailrelay1-us-west.apache.org [209.188.14.139]) by mx1-lw-eu.apache.org (ASF Mail Server at mx1-lw-eu.apache.org) with ESMTP id 2086A5F3E3 for ; Tue, 18 Sep 2018 16:26:01 +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 55444E0D27 for ; Tue, 18 Sep 2018 16:26:00 +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 0BC5523F9C for ; Tue, 18 Sep 2018 16:26:00 +0000 (UTC) Date: Tue, 18 Sep 2018 16:26:00 +0000 (UTC) From: "Ted Yu (JIRA)" To: issues@kylin.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (KYLIN-3095) Use ArrayDeque instead of LinkedList for queue implementation 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/KYLIN-3095?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Ted Yu updated KYLIN-3095: -------------------------- Description: Use ArrayDeque instead of LinkedList for queue implementation where thread safety is not needed. From https://docs.oracle.com/javase/7/docs/api/java/util/ArrayDeque.html {quote} Resizable-array implementation of the Deque interface. Array deques have no capacity restrictions; they grow as necessary to support usage. They are not thread-safe; in the absence of external synchronization, they do not support concurrent access by multiple threads. Null elements are prohibited. This class is likely to be faster than Stack when used as a stack, and *faster than LinkedList when used as a queue.* {quote} was: Use ArrayDeque instead of LinkedList for queue implementation where thread safety is not needed. From https://docs.oracle.com/javase/7/docs/api/java/util/ArrayDeque.html {quote} Resizable-array implementation of the Deque interface. Array deques have no capacity restrictions; they grow as necessary to support usage. They are not thread-safe; in the absence of external synchronization, they do not support concurrent access by multiple threads. Null elements are prohibited. This class is likely to be faster than Stack when used as a stack, and *faster than LinkedList when used as a queue.* {quote} > Use ArrayDeque instead of LinkedList for queue implementation > ------------------------------------------------------------- > > Key: KYLIN-3095 > URL: https://issues.apache.org/jira/browse/KYLIN-3095 > Project: Kylin > Issue Type: Improvement > Reporter: Ted Yu > Assignee: Kaige Liu > Priority: Minor > Labels: parallel > Fix For: Backlog > > > Use ArrayDeque instead of LinkedList for queue implementation where thread safety is not needed. > From https://docs.oracle.com/javase/7/docs/api/java/util/ArrayDeque.html > {quote} > Resizable-array implementation of the Deque interface. Array deques have no capacity restrictions; they grow as necessary to support usage. They are not thread-safe; in the absence of external synchronization, they do not support concurrent access by multiple threads. Null elements are prohibited. This class is likely to be faster than Stack when used as a stack, and *faster than LinkedList when used as a queue.* > {quote} -- This message was sent by Atlassian JIRA (v7.6.3#76005)