How was the reference data updated in Redis?

Updating reference data in Redis usually involves several steps:

1. Retrieving current data — from a database or another source.
2. Preparing data — converting it into the required format (e.g., serialization into JSON or storing in hashes).
3. Updating keys in Redis — using commands like SET, HSET, or others, depending on the data structure.

To ensure consistency, atomic operations or Redis transactions (MULTI/EXEC) are often used. A common approach is to use temporary keys: first write the new data under a temporary key, then rename the key to replace the old one, avoiding a state with partially updated data.

Example in Go using the go-redis library:

ctx := context.Background()
// Fetch data from DB (conditionally)
data := map[string]string{"key1": "value1", "key2": "value2"}

// Update the reference data in Redis as a hash
err := rdb.HSet(ctx, "reference_data", data).Err()
if err != nil {
    // handle error
}

This approach allows quick updates of reference data and ensures their freshness in the cache.