Return-Path: X-Original-To: apmail-hadoop-hdfs-issues-archive@minotaur.apache.org Delivered-To: apmail-hadoop-hdfs-issues-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 01ED1179C4 for ; Fri, 7 Nov 2014 22:38:35 +0000 (UTC) Received: (qmail 4392 invoked by uid 500); 7 Nov 2014 22:38:34 -0000 Delivered-To: apmail-hadoop-hdfs-issues-archive@hadoop.apache.org Received: (qmail 4278 invoked by uid 500); 7 Nov 2014 22:38:34 -0000 Mailing-List: contact hdfs-issues-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: hdfs-issues@hadoop.apache.org Delivered-To: mailing list hdfs-issues@hadoop.apache.org Received: (qmail 4007 invoked by uid 99); 7 Nov 2014 22:38:34 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 07 Nov 2014 22:38:34 +0000 Date: Fri, 7 Nov 2014 22:38:34 +0000 (UTC) From: "Adam Fuchs (JIRA)" To: hdfs-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Created] (HDFS-7380) unsteady and slow performance when writing to file with block size >2GB MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 Adam Fuchs created HDFS-7380: -------------------------------- Summary: unsteady and slow performance when writing to file with block size >2GB Key: HDFS-7380 URL: https://issues.apache.org/jira/browse/HDFS-7380 Project: Hadoop HDFS Issue Type: Bug Affects Versions: 2.4.0 Reporter: Adam Fuchs Attachments: BenchmarkWrites.java Appending to a large file with block size > 2GB can lead to periods of really poor performance (4X slower than optimal). I found this issue when looking at Accmulo write performance in ACCUMULO-3303. I wrote a small test application to isolate this performance down to some basic API calls (to be attached). A description of the execution can be found here: https://issues.apache.org/jira/browse/ACCUMULO-3303?focusedCommentId=14202830&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14202830 The specific hadoop version was as follows: {code} [root@n1 ~]# hadoop version Hadoop 2.4.0.2.1.2.0-402 Subversion git@github.com:hortonworks/hadoop.git -r 9e5db004df1a751e93aa89b42956c5325f3a4482 Compiled by jenkins on 2014-04-27T22:28Z Compiled with protoc 2.5.0 >From source with checksum 9e788148daa5dd7934eb468e57e037b5 This command was run using /usr/lib/hadoop/hadoop-common-2.4.0.2.1.2.0-402.jar {code} -- This message was sent by Atlassian JIRA (v6.3.4#6332)