Troubleshooting multiple Content Deployers

The number of Content Deployers is typically 1, but under specific circumstances, your system can have multiple Content Deployers.

Multiple Content Deployers with multiple databases
You can implement a scenario in which each of your outscaled Web and Application servers has its own Content Deployer. But this can only work if each Deployer deploys to its own database, and external software handles the synchronization of those databases.
Multiple Content Deployers for multiple code pages
If you publish content in multiple code pages to the same destination, you need a separate Content Deployer for each code page.