Disk/Memory Caching

When the cache is full, cache puts (or writes) push the oldest element out of the cache. Elements are then put into the backing disk cache or removed entirely. This makes the caches, LRU caches. You can configure the size of the local cache and the size of the backing disk cache:

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In the driver.properties file, for Drivers.

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In the Engine configuration, for Engines.

If you configure disk caching, then any puts into the memory cache when the memory cache is full force the oldest element out of the memory cache into the disk cache. Any access to a cache element that has to get the element from the disk cache brings the element into the memory cache. CPP Drivers do not have disk-backed cache.