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After Kerberos has been enabled, I was not able to open Hive View from Ambari.

I would get the following error message:

Issue detected

Service 'userhome' check failed: Usernames not matched: name=root != expected=ambari-server-<clusterName>

Service 'userhome' check failed:
java.io.IOException: Usernames not matched: name=root != expected=ambari-server-<clusterName>
	at sun.reflect.GeneratedConstructorAccessor248.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) 

Root cause

Ambari server is running as root so it tries to authenticate with a proxy user as 'root' where as the ambari.service.keytab expects a principal as ambari-server-<clusterName>@REALM. Hence the mismatch.

Solution

1. Edit the view settings

Go to Edit View page on Ambari :

Manage Ambari > Views > Hive > Hive View

Or simply:

http://<ambariHost:port>/views/ADMIN_VIEW/<ambari.version>/INSTANCE/#/views/HIVE/versions/<view.vers...

Substitute the values of <ambariHost:port> , <ambari.version> , <view.version> as needed for example:

http://my.ambari.com:8080/views/ADMIN_VIEW/2.5.2.0/INSTANCE/#/views/HIVE/versions/1.5.0/instances/AU...

Under Settings section:

Update the value: WebHDFS Authentication to auth=KERBEROS;proxyuser=ambari-server-<clusterName>

Save the changes.

2. Update configs:

Navigate to Hive and YARN Configs in Ambari UI and change as below and restart respective services.

<AMBARI_SERVER_PRINCIPAL_USER> should be replaced by ambari-server-<clusterName>

A) Custom webhcat-site

webhcat.proxyuser.<AMBARI_SERVER_PRINCIPAL_USER>.groups=*

webhcat.proxyuser.<AMBARI_SERVER_PRINCIPAL_USER>.hosts=*

B) Custom yarn-site

yarn.timeline-service.http-authentication.<AMBARI_SERVER_PRINCIPAL_USER>.groups=*

yarn.timeline-service.http-authentication.<AMBARI_SERVER_PRINCIPAL_USER>.hosts=*

yarn.timeline-service.http-authentication.<AMBARI_SERVER_PRINCIPAL_USER>.users=*
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Last update:
‎09-13-2017 08:17 PM
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