Harsh J created HDFS-4509:
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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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