Apache Ambari Operations
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Rebalancing HDFS

HDFS provides a “balancer” utility to help balance the blocks across DataNodes in the cluster. To initiate a balancing process, follow these steps:

  1. In Ambari Web, browse to Services > HDFS > Summary.

  2. Click Service Actions, and then click Rebalance HDFS.

  3. Enter the Balance Threshold value as a percentage of disk capacity.

  4. Click Start.

You can monitor or cancel a rebalance process by opening the Background Operations window in Ambari.

More Information

Monitoring Background Operations

Tuning Garbage Collection