Terracotta Discussion Forums (LEGACY READ-ONLY ARCHIVE)

向大家请教一个问题，我使用2.5.7和2.6.3的时候发现一个问题，当我缓存的元素没有达到maxElementsInMemory参数所配置的数量时，ehcache仍会缓存到磁盘，也就是说，缓存到内存的同时，也会缓存到磁盘一份。可是查看网上的资料，不是应该达到maxElementsInMemory的数量以后，才会缓存至磁盘的吗？还是说我配置的有问题？我配置如下：
<cache name="shiro-activeSession"
maxElementsInMemory="5"
eternal="false"
timeToIdleSeconds="120"
timeToLiveSeconds="120"
overflowToDisk="true"
diskPersistent="false"
diskExpiryThreadIntervalSeconds="120"
/>

补充一下，overflowToDisk="false"时，就不会出现上面所描述的问题，overflowToDisk="true" 就会出现。难道说overflowToDisk="true" 时，ehcache有这样的机制，及时没有到达maxElementsInMemory配置的数量，也会把缓存到内存的元素也同时缓存至磁盘一份？

Can you please post in English.

When I use Ehcache(version 2.5.7 and 2.6.3)，the amount of elements is not reach parameter of [maxElementsInMemory] , Ehcache also put each of element to disk .That is to say,Ehcache put element in memory, alse put the same of element on disk.
But i found information from document, only when the amount of elements reach [maxElementsInMemory]，Ehcache will put element on disk，isn't it? Maybe my ehcache.xml has some error?
My ehcache.xml below:

<cache name="shiro-activeSession"
maxElementsInMemory="5"
eternal="false"
timeToIdleSeconds="120"
timeToLiveSeconds="120"
overflowToDisk="true"
diskPersistent="false"
diskExpiryThreadIntervalSeconds="120"
/>

PS:my english is poor! I wish you understand!Thanks for your reply!

Hello wangjin

Please use the following cache configuration:

<cache name="shiro-activeSession"
maxBytesLocalHeap ="some size"
timeToIdleSeconds="120"
timeToLiveSeconds="120"
overflowToDisk="true"
diskPersistent="false"
/>

Please replace "some size" in the above xml to a number that you expect to cache ex. 10M or 1G etc. Please read about sizing ehcache here: http://ehcache.org/documentation/configuration/cache-size