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 1D1AC186D7 for ; Tue, 24 Nov 2015 21:29:12 +0000 (UTC) Received: (qmail 73215 invoked by uid 500); 24 Nov 2015 21:29:11 -0000 Delivered-To: apmail-hadoop-hdfs-issues-archive@hadoop.apache.org Received: (qmail 73139 invoked by uid 500); 24 Nov 2015 21:29:11 -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 72863 invoked by uid 99); 24 Nov 2015 21:29:11 -0000 Received: from arcas.apache.org (HELO arcas) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 24 Nov 2015 21:29:11 +0000 Received: from arcas.apache.org (localhost [127.0.0.1]) by arcas (Postfix) with ESMTP id 3A1872C1F75 for ; Tue, 24 Nov 2015 21:29:11 +0000 (UTC) Date: Tue, 24 Nov 2015 21:29:11 +0000 (UTC) From: "Hudson (JIRA)" To: hdfs-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HDFS-9434) Recommission a datanode with 500k blocks may pause NN for 30 seconds 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/HDFS-9434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15025449#comment-15025449 ] Hudson commented on HDFS-9434: ------------------------------ FAILURE: Integrated in Hadoop-Mapreduce-trunk #2658 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/2658/]) Move HDFS-9434 to 2.6.3 in CHANGES.txt. (szetszwo: rev 56493cda04e30ab737fc6cecc8c43a87d5b006b7) * hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt > Recommission a datanode with 500k blocks may pause NN for 30 seconds > -------------------------------------------------------------------- > > Key: HDFS-9434 > URL: https://issues.apache.org/jira/browse/HDFS-9434 > Project: Hadoop HDFS > Issue Type: Improvement > Components: namenode > Reporter: Tsz Wo Nicholas Sze > Assignee: Tsz Wo Nicholas Sze > Fix For: 2.6.3 > > Attachments: h9434_20151116.patch > > > In BlockManager, processOverReplicatedBlocksOnReCommission is called within the namespace lock. There is a (not very useful) log message printed in processOverReplicatedBlock. When there is a large number of blocks stored in a storage, printing the log message for each block can pause NN to process any other operations. We did see that it could pause NN for 30 seconds for a storage with 500k blocks. > I suggest to change the log message to trace level as a quick fix. -- This message was sent by Atlassian JIRA (v6.3.4#6332)