Authentication required 401 - after disabling kerberos

[#1]

Sometimes, after disabling Kerberos successfully, you can get below error while accessing NN or RM UIs.

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Because of this, all the alerts, Ambari metrics data can be broken because JMX data won't be available to Ambari Metrics or Alerts via HTTP.

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Resolution:

Modify below propery in core-site.xml via Ambari and restart required services.

hadoop.http.authentication.simple.anonymous.allowed=true

Note - Most of the times issue happens because of this property being set as false after disabling Kerberos

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Please also compare below property and see if it is correct.

hadoop.security.authentication=simple

.Issue is simple but it takes lot of time to troubleshoot. Hence posting this article to reduce someone's time 🙂

Please comment if you face any issues or need any further help on this.

Happy Hadooping!! 🙂