tree afec0630d76a6fda8fe26bf68e35472685a6bb1b
parent 0cac9b20c60989b34d82655c096e75b11be9c301
author Stefano Galarraga <galarragas@gmail.com> 1552070044 +0000
committer Stefano Galarraga <galarragas@gmail.com> 1552316190 +0000

Add embrional support for split brain detection

Adds a RefOperationValidationListener to intercept and block operations
if they might cause a split brain, i.e. if the oldId of the refs
they are based on is not the currently most recent in the cluster.
The current code doesn't provide a real implementation of the
centralised DB but just an in memory implementation and a no-op one.
The in memory implementation is probably useless but shows the mechanics
of the centralised one.

The Integration Tests are currently just validating that the new code doesn't
introduce any regression.

Configuration for the in-memory module has not been exposed.

Feature: Issue 10554
Change-Id: I8351ddb386a9528721c1c9670e3304b40f88a67c