This is the documentation for CDH 4.7.1. Documentation for other versions is available at Cloudera Documentation.

Cloudera Manager 4 and CDH 4 have reached End of Maintenance (EOM) on August 9, 2015. Cloudera will not support or provide patches for any of the Cloudera Manager 4 or CDH 4 releases after that date.

Step 12: Start up a DataNode

Begin by starting one DataNode only to make sure it can properly connect to the NameNode. Use the service command to run the /etc/init.d script.

$ sudo service hadoop-hdfs-datanode start

You'll see some extra information in the logs such as:

10/10/25 17:21:41 INFO security.UserGroupInformation:
Login successful for user hdfs/ using keytab file /etc/hadoop/conf/hdfs.keytab

If you can get a single DataNode running and you can see it registering with the NameNode in the logs, then start up all the DataNodes. You should now be able to do all HDFS operations.

This page last updated August 5, 2015