Rebalance the cluster

Let us see how we can rebalance the cluster.

  • Rebalancing is typically related to HDFS.
  • We have a component called as balancer as part of HDFS.
  • The balancer can run by itself, however, we can kickoff balancer by ourselves.
    • We can use Cloudera Manager Web Interface to rebalance the cluster. Go to Actions -> Rebalance the Cluster
    • We can also use hdfs balancer command to balance data in all data nodes in the cluster.
    • To balance data within disks on a given node, we can use hdfs diskbalancer command. However, this is not used that common.

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