Can you explain the concept of Sharing Delta and how it is used in data synchronization systems?

Sharing Delta is a concept used in data synchronization systems to transmit only changes (deltas), rather than the full dataset. This helps save bandwidth and speeds up the update process.

In the context of synchronization systems, such as database replication or file synchronization, Sharing Delta represents a set of changes that occurred since the last synchronization. Instead of sending the entire object or file, the system sends only the difference — added, modified, or deleted parts.

In Go (Golang), this can be implemented through structures describing changes and methods that apply these deltas to local data.

An example of a simplified delta structure:

Type Delta struct {
    Added   []Item
    Removed []ItemID
    Updated []Item
}

func ApplyDelta(data map[ItemID]Item, delta Delta) {
    for _, id := range delta.Removed {
        delete(data, id)
    }
    for _, item := range delta.Added {
        data[item.ID] = item
    }
    for _, item := range delta.Updated {
        data[item.ID] = item
    }
}

Thus, Sharing Delta helps efficiently synchronize state between nodes, minimizing the volume of transmitted data.