Scaling Namespaces and Optimizing Data Storage
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Balancing data across an HDFS cluster

The HDFS Balancer is a tool for balancing the data across the storage devices of a HDFS cluster.

You can also specify the source DataNodes, to free up the spaces in particular DataNodes. You can use a block distribution application to pin its block replicas to particular DataNodes so that the pinned replicas are not moved for cluster balancing.