Return-Path: 
 <hdfs-dev-return-8836-apmail-hadoop-hdfs-dev-archive=hadoop.apache.org@hadoop.apache.org>
X-Original-To: apmail-hadoop-hdfs-dev-archive@minotaur.apache.org
Delivered-To: apmail-hadoop-hdfs-dev-archive@minotaur.apache.org
Received: from mail.apache.org (hermes.apache.org [140.211.11.3])
	by minotaur.apache.org (Postfix) with SMTP id B5095DC54
	for <apmail-hadoop-hdfs-dev-archive@minotaur.apache.org>;
 Fri, 18 Jan 2013 12:28:20 +0000 (UTC)
Received: (qmail 36550 invoked by uid 500); 18 Jan 2013 12:28:20 -0000
Delivered-To: apmail-hadoop-hdfs-dev-archive@hadoop.apache.org
Received: (qmail 36209 invoked by uid 500); 18 Jan 2013 12:28:15 -0000
Mailing-List: contact hdfs-dev-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
List-Help: <mailto:hdfs-dev-help@hadoop.apache.org>
List-Unsubscribe: <mailto:hdfs-dev-unsubscribe@hadoop.apache.org>
List-Post: <mailto:hdfs-dev@hadoop.apache.org>
List-Id: <hdfs-dev.hadoop.apache.org>
Reply-To: hdfs-dev@hadoop.apache.org
Delivered-To: mailing list hdfs-dev@hadoop.apache.org
Received: (qmail 36141 invoked by uid 99); 18 Jan 2013 12:28:12 -0000
Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28)
    by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 18 Jan 2013 12:28:12 +0000
Date: Fri, 18 Jan 2013 12:28:12 +0000 (UTC)
From: "Max Lapan (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Message-ID: <JIRA.12628198.1358512003825.158290.1358512092572@arcas>
In-Reply-To: <JIRA.12628198.1358512003825@arcas>
References: <JIRA.12628198.1358512003825@arcas>
Subject: [jira] [Created] (HDFS-4420) Provide a way to exclude subtree from
 balancing process
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394

Max Lapan created HDFS-4420:
-------------------------------

             Summary: Provide a way to exclude subtree from balancing process
                 Key: HDFS-4420
                 URL: https://issues.apache.org/jira/browse/HDFS-4420
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: balancer
    Affects Versions: 0.20.2
            Reporter: Max Lapan
            Priority: Minor
             Fix For: 0.20.2


During balancer operation, it balances all blocks, regardless of their filesystem hierarchy. Sometimes, it would be usefull to exclude some subtree from balancing process.

For example, regionservers data locality is cruical for HBase performance. Region's data is tied to regionservers, which reside on specific machines in cluster. During operation, regionservers reads and writes region's data, and after some time, all this data are reside on local machine, so, all reads become local, which is great for performance. Balancer breaks this locality during opertation by moving blocks around.

This patch adds [-exclude <path>] switch, and, if path is provided,
balancer will not move blocks under this path during operation.

Attached patch have tested for 0.90.2.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira