EM13c : Master Agent Switch Happening To Node That Monitors DB Instance Which Is Unhealthy
(Doc ID 2715834.1)
Last updated on SEPTEMBER 30, 2020
Applies to:Enterprise Manager Base Platform - Version 220.127.116.11.0 to 18.104.22.168.0 [Release 13c]
Information in this document applies to any platform.
In Enterprise Manager (EM) Cloud Control, Master Agent switch can happen in the below two scenarios:
1. Agent clean heartbeat post the blackout end:
# When the Agent (A1) comes out of the blackout, It sends the clean heartbeat to OMS.
# As a part of recording the heartbeat flow, there is a validation on the status of the Current Master Agent(A2).
# If the Master Agent status (A2) is not UP and the current agent (A1) status is UP, this would again trigger the Master Agent switch to A1 without
explicitly checking the DB instance status monitored by A1.
2. DB instance Status change:
# When the instance(DB1) status change is received and new status is UP, there is validation to check if the current Master agent(A2)'s instance(DB2) is UP.
# There is no explicit validation in place to check the status of the agents A1 and A2.
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