Hi @luobo2019 , Can you please try the below 2 things and let me know how it goes - Resolution 1 - Step 1: cat /etc/ambari-server/conf/ambari.properties | grep ambari-server.user. Know the user from above command. Step 2: change user /var/run/ambari-server chown -R <output of above command> /var/run/ambari-server Resolution 2 - Take Ambari DB backup 1. Query the ambari.alert_current and ambari.alert_history tables, look at the 'definition_id' and 'alert_definition' columns in these tables. 2. Look at the alert_definitions table select definition_id from ambari.alert_definition; and check the definition IDs. 3. Look for any definition IDs referenced in the alert_current and alert_history tables that are not present in alert_definition. 4. In ambari.alert_current, remove any row that references a definition ID that is not present in alert_definition 5. In ambari.alert_history, remove any row that references a definition ID that is not present in alert_definition
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