Ehcache size configuration

Since Ehcache 2.5, you’ve got Automatic Resource Control (ARC), which help you to easily tune your cache.

When you think that software is constantly changing, let’s say you have a class that takes 1Kb when instantiated, then you put 1000000 elements in a cache, it takes 1Gb. After a few releases, the class has been modified, it has more fields, and it takes now 2Kb when instantiated, the exact same cache definition will take 2Gb…

ARC helps you to define a cache by memory size. In this example you say you want your cache to use 1Gb of heap memory, it will first hold 1M elements, then 500000… Your tuning is automatically handled…

In case you want to have a look at ARC vs count-based config, here is a summary of options you can use:

Standalone – Cache Configuration

Count-based Count-based – legacy pre-2.5 Size-based (ARC)
Heap maxEntriesLocalHeap maxElementsInMemory (deprecated) maxBytesLocalHeap
Off heap maxMemoryOffHeap maxMemoryOffHeap maxBytesLocalOffHeap
Disk maxEntriesLocalDisk maxElementsOnDisk maxBytesLocalDisk

Clustered – Cache Configuration

Count-based Count-based – legacy pre-2.5 Size-based (ARC)
Heap maxEntriesLocalHeap maxElementsInMemory (deprecated) maxBytesLocalHeap
Off heap maxMemoryOffHeap maxMemoryOffHeap maxBytesLocalOffHeap
Disk NA maxElementsOnDisk NA

more info on Ehcache ARC

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