Return-Path: X-Original-To: apmail-hadoop-hdfs-user-archive@minotaur.apache.org Delivered-To: apmail-hadoop-hdfs-user-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 13465110DC for ; Mon, 9 Jun 2014 09:15:41 +0000 (UTC) Received: (qmail 63045 invoked by uid 500); 9 Jun 2014 09:15:36 -0000 Delivered-To: apmail-hadoop-hdfs-user-archive@hadoop.apache.org Received: (qmail 62911 invoked by uid 500); 9 Jun 2014 09:15:35 -0000 Mailing-List: contact user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@hadoop.apache.org Delivered-To: mailing list user@hadoop.apache.org Received: (qmail 62904 invoked by uid 99); 9 Jun 2014 09:15:35 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 09 Jun 2014 09:15:35 +0000 X-ASF-Spam-Status: No, hits=0.9 required=5.0 tests=HK_RANDOM_ENVFROM,HK_RANDOM_FROM,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of trtrmitya@gmail.com designates 209.85.215.50 as permitted sender) Received: from [209.85.215.50] (HELO mail-la0-f50.google.com) (209.85.215.50) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 09 Jun 2014 09:15:31 +0000 Received: by mail-la0-f50.google.com with SMTP id b8so2920661lan.9 for ; Mon, 09 Jun 2014 02:15:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:content-type:content-transfer-encoding:subject:message-id:date :to:mime-version; bh=xk9jEWuNlsI0jJrTv5R+M0Fw3POTGq6iaG+yhwa+on4=; b=ZDy5XJuAs4LCGieH/zES48Ma81IJLR1wCRjyVHTAmTLUY5YOcRef26hXioQ0/BE4Fi UuFfldG3g1WDm7kAKyX3y2ARiiA4OBXGi3wuu+xYQ82kQKPW/RVHtp8Z6N/97vsXBaqj 9lFDnBuxwjJ35uQ80YaXxjXPXFb52f6HnnlL70V3tZbIjW0wMZZlVsvQRl1MG139i2mN 2lJx4VGQkvg7Ge55DnKOuWNNTOLkwN3/+R3iOTHdZFiBLzXIyiV06025yWahZnvxcgeX MihlfyRCdvOcBv9MR9SaINxvE9nLnesdpAjFubTXLMdgqiLTuRM6GVpXq+nuNbys/Gfw BUEA== X-Received: by 10.112.34.49 with SMTP id w17mr337832lbi.84.1402305307758; Mon, 09 Jun 2014 02:15:07 -0700 (PDT) Received: from 95.108.173.189-red.dhcp.yndx.net (95.108.173.189-red.dhcp.yndx.net. [95.108.173.189]) by mx.google.com with ESMTPSA id aa1sm17589125lbd.12.2014.06.09.02.15.06 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 09 Jun 2014 02:15:07 -0700 (PDT) From: Dmitry Sivachenko Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Subject: Idle tasktracker eats CPU Message-Id: <6C662AEB-8949-4502-A46C-5C2BD238F36F@gmail.com> Date: Mon, 9 Jun 2014 13:15:06 +0400 To: user@hadoop.apache.org Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.2\)) X-Mailer: Apple Mail (2.1878.2) X-Virus-Checked: Checked by ClamAV on apache.org Hello! I set up hadoop-1.2.1 on FreeBSD-10/stable with openjdk version = 1.7.0_60. On the first glance it is doing well except one annoying thing: after = executing some tasks, tasktracker process starts to eat CPU when idle. Sometimes it is 10-20% (numbers from top(1) output), sometimes it is = 100-150%. In tasktrackers's log I see numerious records like this: 2014-06-09 13:08:29,858 INFO org.mortbay.log: = org.mortbay.io.nio.SelectorManager$SelectSet@abdcc1c JVM BUG(s) - = injecting delay59 times 2014-06-09 13:08:29,859 INFO org.mortbay.log: = org.mortbay.io.nio.SelectorManager$SelectSet@abdcc1c JVM BUG(s) - = recreating selector 59 times, canceled keys 944 times 2014-06-09 13:09:29,862 INFO org.mortbay.log: = org.mortbay.io.nio.SelectorManager$SelectSet@abdcc1c JVM BUG(s) - = injecting delay58 times 2014-06-09 13:09:29,862 INFO org.mortbay.log: = org.mortbay.io.nio.SelectorManager$SelectSet@abdcc1c JVM BUG(s) - = recreating selector 58 times, canceled keys 928 times 2014-06-09 13:10:29,901 INFO org.mortbay.log: = org.mortbay.io.nio.SelectorManager$SelectSet@abdcc1c JVM BUG(s) - = injecting delay58 times 2014-06-09 13:10:29,901 INFO org.mortbay.log: = org.mortbay.io.nio.SelectorManager$SelectSet@abdcc1c JVM BUG(s) - = recreating selector 58 times, canceled keys 928 times Is it a known thing? Is there any workaround available? Thanks in advance.=