Ambari User's Guide
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Rebalancing HDFS

This topic describes how you can initiate an HDFS rebalance from Ambari. HDFS provides a “balancer” utility to help balance the blocks across DataNodes in the cluster.

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

  2. Select Service Actions, then choose Rebalance HDFS.

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

  4. Click Start to begin the rebalance. You can check rebalance progress or cancel a rebalance in process by opening the Background Operations dialog in Ambari.