Specifying racks for hosts
HDFS uses the network location of your deployment, such as hosts and racks, to place block replicas more intelligently and trade off performance and resilience. When placing jobs on hosts, CDP prefers within-rack transfers, where there is more bandwidth available, to off-rack transfers. These computations are performed with the assistance of rack awareness scripts. Cloudera Manager includes internal rack awareness scripts, but you must specify the racks where the hosts in your cluster are located.
- In Cloudera Manager, go to .
- Select the checkboxes corresponding to the hosts for which you want to specify the racks.
- Select .
Enter a rack name or ID that begins with a slash (
/); for example,
/aisle1/rack123, and click Confirm.
- Restart the affected services.