MySql Multi Master Active Active Mutli Write

I am establishing Multi Master Replication [All mater can write to their database], Initially I started with two server. After establishing connection and sync data on both servers. There are some questions which are bothering me like 1. If there is connection lost between two server and at that time both updates the same row or create a row with same primary. There will be collision between them and sync will break. 2. Can we implement same things for Multiple Master configuration? 3. Is there any monitoring and conflict resolution tools which can I use?