问题
I would like to use EhCache in combination of memory and disk cache. EhCache should move new elements to disk when memory is full. e.g. I have 100 elements in ehCache memory store and tries to put 101st element and if memory is full then put 101st element to disk not 1st element.
Could you please let me know the cache configuration to achieve this?
回答1:
Ehcache no longer works that way. The tiering model introduced in Ehcache 2.6 and used since then will always store ALL mappings into the lower tier, disk in your case.
The reason is predictable latency. If Ehcache waited for the memory tier to be full before using the disk, you would see a latency increase maybe at the worst time for your application. While the model were all mappings are written to disk gives you the upper bound for the write latency, while reads may be faster for hot value that are available in memory directly.
来源：https://stackoverflow.com/questions/36514705/ehcache-to-put-new-element-to-disk-if-memory-store-full