Oracle Coherence and Split-Brain FAQ
(Doc ID 1069132.1)
Last updated on SEPTEMBER 01, 2023
Applies to:
Oracle Coherence - Version 3.7.1.1 and laterInformation in this document applies to any platform.
Purpose
This FAQ is a high level description of "Split-Brain" and how it applies to Oracle Coherence. See <Note 1069429.1> for a specific example of a Split-Brain occurrence in Oracle Coherence.
Questions and Answers
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In this Document
| Purpose |
| Questions and Answers |
| What is Split-Brain? |
| What does "co-operating" mean? |
| What's at risk? |
| What if the processes aren't co-operating? |
| I thought Split-Brain was all about physical network infrastructure and connectivity failures. Can it really occur at the process level, on the same physical server? |
| Garbage Collection can't cause a Split-Brain. Right? |
| Split-Brain will only ever occur when a system has two processes. With three or more processes it can easily be detected and resolved. Right? |
| Splits always occur "down-the-middle". Right? |
| Stateless architectures don't suffer from Split-Brain. Right? |
| Client+Server architectures don't suffer from Split-Brain. Right? |
| All Stateful architectures suffer from Split-Brain. Right? |
| The solution is simple - completely avoid Split-Brains by waiting longer for communication to recover, doing more checks and avoiding assumptions. Right? |
| Split-Brain only occurs in systems that use unreliable network protocols (ie: protocols other than TCP/IP). Right? |
| TCP/IP decreases the chances of a Split-Brain occurring. Right? |
| Having all processes in a distributed system connected via a single physical switch will help prevent Split-Brain. Right? |
| Can Split-Brain be solved? |
| What are the best practices for dealing with Split-Brain? |
| How can a Split-Brain event be detected? How are they defined? |
| How does Oracle Coherence deal with Split-Brain? |
| References |