Can you explain what is meant by 'consistent caching'?

Consistent caching is an approach to cache organization where data in the cache is always synchronized with the data source (e.g., a database). This means that when data in the source changes, the cache is either updated or invalidated to prevent discrepancies.

The main ways to ensure cache consistency are:

• Write-through: data is updated in both the cache and the database simultaneously during a write.
• Write-back: changes are first made in the cache and then periodically synchronized with the database.
• Cache invalidation: when data in the database changes, the cache is marked as stale and updated upon the next request.

In Go, this can be implemented using data structures and synchronization mechanisms to guarantee atomic updates and prevent data races.