How to implement transactional management in a distributed system?

In a distributed system, transaction management is implemented using protocols that ensure consistency and atomicity of operations across multiple nodes. One of the most common approaches is the two-phase commit protocol (2PC).

How 2PC works:

1. The coordinator sends a prepare request to all participants.
2. Each participant performs a local check and responds with 'ready' or 'abort'.
3. If all participants are ready, the coordinator sends a commit command; otherwise, it sends a rollback.
4. Participants perform commit or rollback accordingly.

In Go, contexts and channels can be used for coordination and timeouts. There are also libraries and frameworks that implement distributed transactions.

Other approaches include:

• The three-phase commit protocol (3PC) for increased reliability.
• Using idempotent operations and compensating transactions (Sagas) for eventual consistency.

An example of a simplified 2PC scheme in Go (pseudocode):

func coordinator(participants []Participant) error {
    for _, p := range participants {
        if !p.Prepare() {
            rollbackAll(participants)
            return errors.New("prepare failed")
        }
    }
    for _, p := range participants {
        p.Commit()
    }
    return nil
}