Mailing-List: contact hdfs-dev-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: hdfs-dev@hadoop.apache.org
Date: Sun, 17 Feb 2013 19:55:12 +0000 (UTC)
From: "Harsh J (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Message-ID: <JIRA.12632762.1361130809972.299564.1361130912416@arcas>
In-Reply-To: <JIRA.12632762.1361130809972@arcas>
References: <JIRA.12632762.1361130809972@arcas>
Subject: [jira] [Created] (HDFS-4509) Provide a way to ask Balancer to
 exclude certain DataNodes in its computation and/or work.
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

Harsh J created HDFS-4509:
-----------------------------

             Summary: Provide a way to ask Balancer to exclude certain DataNodes in its computation and/or work.
                 Key: HDFS-4509
                 URL: https://issues.apache.org/jira/browse/HDFS-4509
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: balancer
            Reporter: Harsh J
            Priority: Minor


This comes particularly useful in clusters that have a split between DNs used for regular purpose and DNs used for HBase RSes specifically. By asking the balancer to exclude the DNs that RSes run on, its possible to avoid impacting HBase's local reads performance, and the balancing of these nodes can be deferred to a later time.

An alternate, and perhaps simpler approach would be to make the Balancer file-aware and ask it to skip a specific directory's file's blocks (i.e. that of /hbase for example).

--
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