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MOD_OC4J Does Not Failover Properly After Connection With One Node Is Lost (Doc ID 457302.1)

Last updated on NOVEMBER 04, 2022

Applies to:

Oracle HTTP Server - Version to [Release AS10g to AS10gR3]
Information in this document applies to any platform.



The architecture is a AS 10.1.2 architecture on Linux with with 4 midtiers each one running on its own box:

The problem is load balancing is fine but no dead detection is performed by MOD_OC4J and requests to dead OC4J instances are performed, meaning 50% of the requests can not be served if one instance is down.

The tested scenario consists in unplugging the network cable of one of the OC4J boxes from the network.

The problem can not be reproduced if the OC4J instances are shutdown with opmnctl stopall or if we shutdown the whole box instead of unplugging the cable.




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