Return-Path: X-Original-To: apmail-accumulo-notifications-archive@minotaur.apache.org Delivered-To: apmail-accumulo-notifications-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id DE0FD100BB for ; Tue, 9 Dec 2014 18:38:12 +0000 (UTC) Received: (qmail 47345 invoked by uid 500); 9 Dec 2014 18:38:12 -0000 Delivered-To: apmail-accumulo-notifications-archive@accumulo.apache.org Received: (qmail 47312 invoked by uid 500); 9 Dec 2014 18:38:12 -0000 Mailing-List: contact notifications-help@accumulo.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: jira@apache.org Delivered-To: mailing list notifications@accumulo.apache.org Received: (qmail 47263 invoked by uid 99); 9 Dec 2014 18:38:12 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 09 Dec 2014 18:38:12 +0000 Date: Tue, 9 Dec 2014 18:38:12 +0000 (UTC) From: "Eric Newton (JIRA)" To: notifications@accumulo.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (ACCUMULO-3396) HDFS reads are hanging 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/ACCUMULO-3396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Eric Newton updated ACCUMULO-3396: ---------------------------------- Summary: HDFS reads are hanging (was: HDFS reads are haning) > HDFS reads are hanging > ---------------------- > > Key: ACCUMULO-3396 > URL: https://issues.apache.org/jira/browse/ACCUMULO-3396 > Project: Accumulo > Issue Type: Bug > Components: tserver > Affects Versions: 1.6.0, 1.6.1 > Environment: rhel6 linux 2.6.32-279 (x86_64) > java 1.7.0_67-b01 > hadoop CDH5.1.2, HA (2) federated (2) NN configuration > large production cluster > Reporter: Eric Newton > Assignee: Eric Newton > Priority: Blocker > > On large clusters we are seeing various forms of HDFS reads hanging: > Queries that never return. > Major compactions that hang. > Accumulo 1.6.1 incorporates detectors that report hanging major compactions and a monitor display that reports scans by age. > Stack traces show readers in sun.nio.ch.EPollArrayWrapper.epollWait and in org.apache.hadoop.ipc.Client.Call(Client.java:1362). > Netstat results for the tablet server shows many connections with a single byte waiting on the Recv-Q of the process, and no bytes waiting on the Send-Q. > strace of the jvm shows the typical jvm thread noise (futex calls) > jstack shows lots of read-requests to the NN. > long-running MajC's do complete, albeit slowly. -- This message was sent by Atlassian JIRA (v6.3.4#6332)