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 80F0518572 for ; Wed, 12 Aug 2015 19:02:47 +0000 (UTC) Received: (qmail 66309 invoked by uid 500); 12 Aug 2015 19:02:47 -0000 Delivered-To: apmail-accumulo-notifications-archive@accumulo.apache.org Received: (qmail 66262 invoked by uid 500); 12 Aug 2015 19:02:47 -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 66038 invoked by uid 99); 12 Aug 2015 19:02:47 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 12 Aug 2015 19:02:47 +0000 Date: Wed, 12 Aug 2015 19:02:47 +0000 (UTC) From: "Josh Elser (JIRA)" To: notifications@accumulo.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (ACCUMULO-3957) Consider moving off getContentSummary in the monitor 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-3957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14694016#comment-14694016 ] Josh Elser commented on ACCUMULO-3957: -------------------------------------- HDFS-8046 may be related. > Consider moving off getContentSummary in the monitor > ---------------------------------------------------- > > Key: ACCUMULO-3957 > URL: https://issues.apache.org/jira/browse/ACCUMULO-3957 > Project: Accumulo > Issue Type: Bug > Components: monitor > Reporter: Josh Elser > Assignee: Josh Elser > Priority: Critical > Fix For: 1.6.4, 1.7.1, 1.8.0, 1.5.4 > > > Recently heard about an issue where a large Hadoop installation which had Accumulo running was experiencing long pauses in the Namenode. Inspecting NN audit logs, it was found that the user running Accumulo issues a {{getContentSummary("/")}} call just before the NN pauses were experienced. > In {{DefaultServlet.java}}, we use this call to compute the total HDFS disk usage and present a ratio of space that Accumulo uses relative to the total available space. > It's still unclear why this was causing issues in this case (as this operation should only be acquiring a read-lock in the namenode), it was recommended to me that Accumulo use the JMX metrics for the NN instead of making this call. -- This message was sent by Atlassian JIRA (v6.3.4#6332)