Question: Does restarting Memcached clear cache?

Answer

However, there are some techniques that can be used to minimize the impact of restarting Memcached on your application's cache. One such technique is known as "cache warming". Cache warming involves preloading the cache with frequently accessed data before restarting Memcached. This can help reduce the time it takes for the cache to become fully operational after a restart.

Here is an example of how to use cache warming with Memcached:

import memcache

# Initialize a new Memcached client instance
mc = memcache.Client(['127.0.0.1:11211'], debug=0)

# Preload the cache with frequently accessed data
mc.set('key1', 'value1')
mc.set('key2', 'value2')
mc.set('key3', 'value3')

# Restart Memcached
# ...

# Access the cached data
value1 = mc.get('key1')
value2 = mc.get('key2')
value3 = mc.get('key3')

In the above example, we initialize a new Memcached client instance and preload it with some frequently accessed data using the set() method. After restarting Memcached, we can then access the cached data using the get() method. By preloading the cache with frequently accessed data, we minimize the impact of the cache being empty after a restart.

It's also worth noting that some Memcached clients support automatic cache reloading when a cache miss occurs. This means that if you try to access data that is not currently cached, the client will automatically reload the data from the backend data store and add it to the cache. This can help reduce the impact of restarting Memcached on your application's cache.