From common-issues-return-154647-archive-asf-public=cust-asf.ponee.io@hadoop.apache.org Wed Jul 11 10:51:05 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 89896180676 for ; Wed, 11 Jul 2018 10:51:04 +0200 (CEST) Received: (qmail 92842 invoked by uid 500); 11 Jul 2018 08:51:03 -0000 Mailing-List: contact common-issues-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Delivered-To: mailing list common-issues@hadoop.apache.org Received: (qmail 92552 invoked by uid 99); 11 Jul 2018 08:51:03 -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; Wed, 11 Jul 2018 08:51:03 +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 E7ADC1A2C27 for ; Wed, 11 Jul 2018 08:51:02 +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-us.apache.org ([10.40.0.8]) by localhost (spamd2-us-west.apache.org [10.40.0.9]) (amavisd-new, port 10024) with ESMTP id Bvt5PUdjNmAU for ; Wed, 11 Jul 2018 08:51:02 +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 9FC905F3F2 for ; Wed, 11 Jul 2018 08:51:01 +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 0F6D6E1311 for ; Wed, 11 Jul 2018 08:51:01 +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 5EEC227146 for ; Wed, 11 Jul 2018 08:51:00 +0000 (UTC) Date: Wed, 11 Jul 2018 08:51:00 +0000 (UTC) From: "Prasanth Jayachandran (JIRA)" To: common-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (HADOOP-15598) DataChecksum calculate checksum is contented on hashtable synchronization 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/HADOOP-15598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Prasanth Jayachandran updated HADOOP-15598: ------------------------------------------- Summary: DataChecksum calculate checksum is contented on hashtable synchronization (was: DataChecksum calculate checksum is contented on hashtable lock) > DataChecksum calculate checksum is contented on hashtable synchronization > ------------------------------------------------------------------------- > > Key: HADOOP-15598 > URL: https://issues.apache.org/jira/browse/HADOOP-15598 > Project: Hadoop Common > Issue Type: Bug > Components: common > Affects Versions: 3.2.0 > Reporter: Prasanth Jayachandran > Priority: Major > Attachments: Screen Shot 2018-07-11 at 1.45.06 AM.png > > > When profiling a multi-threaded hive streaming ingest, observed lock contention on java.util.Properties getProperty() to check if os is "sparc". java.util.Properties internally uses HashTable. HashTable.get() is synchronized method. In the test application, on a 30s profile with 64 threads ~40% CPU time is spent on getProperty() contention. See attached snapshot. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscribe@hadoop.apache.org For additional commands, e-mail: common-issues-help@hadoop.apache.org