Hi, Am getting below error from Ambari UI i.e., while starting or stopping or restarting the components present in Hadoop cluster. Could any one help please  ______________________________________________________________________________ Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.0.v20120608-r11652): org.eclipse.persistence.exceptions.DatabaseException Internal Exception: java.sql.BatchUpdateException: Batch entry 0 INSERT INTO request (request_id, cluster_id, command_name, create_time, end_time, exclusive_execution, inputs, request_context, request_type, start_time, status, request_schedule_id) VALUES (820, 2, NULL, 1587733705827, -1, 0, NULL, 'Start History Server', 'INTERNAL_REQUEST', -1, NULL, NULL) was aborted. Call getNextException to see the cause. Error Code: 0 Call: INSERT INTO request (request_id, cluster_id, command_name, create_time, end_time, exclusive_execution, inputs, request_context, request_type, start_time, status, request_schedule_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) bind => [12 parameters bound]   ... View more