Failed to Start WebHCat

Symptom

WebHCat fails to be started after the hostname is changed.

The following error is reported in the WebHCat startup log (/var/log/Bigdata/hive/webhcat/hive.log) of the corresponding node:

Cause Analysis

1. The server account of the MRS WebHCat role involves the hostname. If you change the hostname after the installation, WebHCat fails to start.
2. The one-to-many or many-to-one association between IP addresses and hostnames is configured in the /etc/hosts file. As a result, the IP address and hostname cannot be obtained correctly after the hostname and hostname -i commands are executed.

Solution

1. Change the hostname of the modified node to the hostname before the cluster is installed.
2. Check whether the /etc/hosts of the node where WebHCat is located is correctly configured.
3. Restart WebHCat.