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 E690E10A76 for ; Tue, 17 Feb 2015 23:27:11 +0000 (UTC) Received: (qmail 45643 invoked by uid 500); 17 Feb 2015 23:27:11 -0000 Delivered-To: apmail-hadoop-hdfs-issues-archive@hadoop.apache.org Received: (qmail 45583 invoked by uid 500); 17 Feb 2015 23:27:11 -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 45571 invoked by uid 99); 17 Feb 2015 23:27:11 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 17 Feb 2015 23:27:11 +0000 Date: Tue, 17 Feb 2015 23:27:11 +0000 (UTC) From: "Colin Patrick McCabe (JIRA)" To: hdfs-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HDFS-7759) Provide existence-of-a-second-file implementation for pinning blocks on Datanode 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-7759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14325105#comment-14325105 ] Colin Patrick McCabe commented on HDFS-7759: -------------------------------------------- This seems like it will lead to a lot of problems. If blocks can't be moved, then the balancer can't work. It means that if nodes are lost in the cluster, then we can't re-replicate. Why not simply write a pluggable block placement policy instead? > Provide existence-of-a-second-file implementation for pinning blocks on Datanode > -------------------------------------------------------------------------------- > > Key: HDFS-7759 > URL: https://issues.apache.org/jira/browse/HDFS-7759 > Project: Hadoop HDFS > Issue Type: Improvement > Components: datanode > Reporter: zhaoyunjiong > Assignee: zhaoyunjiong > Attachments: HDFS-7759.patch > > > Provide existence-of-a-second-file implementation for pinning blocks on Datanode and let admin choosing the mechanism(use sticky bit or existence-of-a-second-file) to pinning blocks on favored Datanode. -- This message was sent by Atlassian JIRA (v6.3.4#6332)