[hibernate-issues] [Hibernate-JIRA] Created: (HHH-5478) Update Ehcache capabilities in the section [21.2. The Second Level Cache] of the documentation

[Pascal Thivent (JIRA)]

Update Ehcache capabilities in the section [21.2. The Second Level Cache] of the documentation
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                 Key: HHH-5478
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5478
             Project: Hibernate Core
          Issue Type: Improvement
          Components: documentation
            Reporter: Pascal Thivent
            Priority: Minor


According to the [Hibernate Second Level Cache|http://ehcache.org/documentation/hibernate.html] documentation on the Ehcache website, Ehcache 2.0+ is cluster safe:

{quote}
h3. [Is Ehcache Cluster Safe?|http://ehcache.org/documentation/hibernate.html#Is_Ehcache_Cluster_Safe]

hibernate.org maintains a table listing the providers. While ehcache works as a distributed cache for Hibernate, it is not listed as "Cluster Safe". What this means is that `Hibernate's lock and unlock methods are not implemented. Changes in one node will be applied without locking. This may or may not be a noticeable problem.

In Ehcache 1.7 when using Terracotta, this cannot happen as access to the clustered cache itself is controlled with read locks and write locks.

In Ehcache 2.0 when using Terracotta, the lock and unlock methods tie-in to the underlying clustered cache locks. We expect Ehcache 2.0 to be marked as cluster safe in new versions of the Hibernate documentation.
{quote}

And as of Ehcache 2.1.0, Ehcache now supports the transactional strategy. From the [JPA|http://ehcache.org/documentation/jta.html] page:

{quote}
h3. Hibernate Transactions

Ehcache is a "transactional" cache for Hibernate purposes. The <<<net.sf.ehcache.hibernate.EhCacheRegionFactory>>>
has support for Hibernate entities configured with <cache usage="transactional"/>.
{quote}

Shouldn't the cache provider table of the section [21.2. The Second Level Cache|http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html/performance.html#performance-cache] and the cache compatibility matrix of the section [21.2.6. Cache-provider/concurrency-strategy compatibility|http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html/performance.html#performance-cache-compat-matrix] be updated to reflect this (or at least make it clear that this is possible, be it through third party support)?


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