GCP: GAE - Memcache best practices

Memcache is a distributed in-memory data cache in front of or in place of robust persistent storage for some tasks.
GAE includes a memory cache service for this purpose.

Best practices for using memcache:
1. Handling memcache API failures gracefully; Do not expose errors to the end users
2. Use batching capability of the API when possible
3. Distribute load across your memcache keyspace

• Use sharding and aggregating for improving performance efficiency.
• Use TTL (expiration policy) to make sure the memcache does not fill-up indefinitely
• Use getIdentifiable() and putIfUntouched() for managing the values that may get affected by concurrent updates
• Use batching (getMulti ("comments", "commented_by") ) to fetch related values together instead of one by one
• Use graceful error handling