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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4509) Provide a way to ask Balancer to exclude certain DataNodes in its computation and/or work.
Date Sun, 17 Feb 2013 19:55:12 GMT
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).

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