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Oracle Coherence, Split-Brain, and Recovery Protocols In Detail (Doc ID 1069429.1)

Last updated on SEPTEMBER 01, 2023

Applies to:

Oracle Coherence - Version 3.7.1.1 and later
Oracle WebLogic Server - Version 10.3.6 and later
Information in this document applies to any platform.

Goal

This document is a continuation of <Note 1069132.1> which provides a high-level conceptual overview of Split-Brain scenarios in distributed systems.  This document will focus on a specific example of cluster communication failure and recovery in Oracle Coherence.  This includes a discussion on the witness protocol (used to remove failed cluster members) and the panic protocol (used to resolve Split-Brain scenarios.)

Note that the removal of cluster members does not necessarily indicate a Split-Brain condition!  Oracle Coherence does not (and cannot) detect a Split-Brain as it occurs; the condition is only detected when cluster members that previously lost contact with each other regain contact.

Solution

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In this Document
Goal
Solution
 Details
 Cluster Setup
 Switch Disconnect
 Switch Reconnect
References

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