Table of Contents
Can ehcache be distributed?
Distributed caching is available with BigMemory Max.
What is the use of ehcache?
Ehcache is a standards-based caching API that is used by Integration Server. Caching enables an application to fetch frequently used data from memory (or other nearby resource) rather than having to retrieve it from a database or other back-end system each time the data is needed.
What is Offheap ehcache?
The on-heap store refers to objects that will be present in the Java heap (and also subject to GC). On the other hand, the off-heap store refers to (serialized) objects that are managed by EHCache, but stored outside the heap (and also not subject to GC).
How does ehcache store data?
Data stores supported by Ehcache include: On-Heap Store – Utilizes Java’s on-heap RAM memory to store cache entries. This tier utilizes the same heap memory as your Java application, all of which must be scanned by the JVM garbage collector.
When can you evict a cache?
Cache eviction is a feature where file data blocks in the cache are released when fileset usage exceeds the fileset soft quota, and space is created for new files. The process of releasing blocks is called eviction. However, file data is not evicted if the file data is dirty.
What is Ehcache DiskStore?
DiskStore. The DiskStore provides a disk spooling facility that can be used for additional storage during cache operation and for persisting caches through system restarts. For more information about cache persistence on disk, refer to the Persistence and Restartability page.
What is cache eviction in Ehcache?
A cache eviction algorithm is a way of deciding which element to evict when the cache is full. In Ehcache, the MemoryStore may be limited in size (see How to Size Caches for more information).
How do you evict a cache from a pool?
Removing the common factor of ‘eviction’ which is the same in all caches lead us to evicting from the cache with the minimum value of: When a cache has a zero hit-rate (it is in a pure loading phase) we deviate from this algorithm and allow the cache to occupy 1/n’th of the pool space where ‘n’ is the number of caches using the pool.
What are the effects of cache eviction on replication?
An effect of this is that even if a cache is configured for replication, if eviction is enabled the contents of a cache will be different between peers in the cluster; some may have evicted some data, while others will have evicted different data.
What happens when Ehcache memorystore gets full?
In Ehcache, the MemoryStore may be limited in size (see How to Size Caches for more information). When the store gets full, elements are evicted. The eviction algorithms in Ehcache determine which elements are evicted.