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HBase >> mail # user >> Unbalanced region server

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Unbalanced region server

What can make a region server unbalanced when it comes to space ? (and
possibly requests too).

For example; I have 5 node cluster (replication factor of 3); and in which
all 4 has same size; where as one node is almost double in size for /hbase.

Any help will be appreciated; esp what makes the skew and how to fix it ?