[jboss-jira] [JBoss JIRA] Commented: (JBCACHE-807) Document limitations of FileCacheLoader

Fri Mar 30 13:16:18 EDT 2007

    [ http://jira.jboss.com/jira/browse/JBCACHE-807?page=comments#action_12357955 ] 

Manik Surtani commented on JBCACHE-807:
---------------------------------------

As a potential section under file cache loaders in the user guide, FCL javadoc and an FAQ:

"The FileCacheLoader has some severe limitations which restrict it's use in a production environment, or if used in such an environment, it should be used with due care and sufficient understanding of these limitations.

* Due to the way the FileCacheLoader represents a tree structure on disk (directories and files) traversal is inefficient for deep trees.
* Usage on shared filesystems like NFS, Windows shares, etc. should be avoided as these do not implement proper file locking and can cause data corruption.
* Usage with an isolation level of NONE can cause corrupt writes as multiple threads attempt to write to the same file.
* File systems are inherently not transactional, so when attempting to use your cache in a transactional context, failures when writing to the file (which happens during the commit phase) cannot be recovered.

As a rule of thumb, it is recommended that the FileCacheLoader not be used in a highly concurrent, transactional or stressful environment, and it's use is restricted to testing."

> Document limitations of FileCacheLoader
> ---------------------------------------
>
>                 Key: JBCACHE-807
>                 URL: http://jira.jboss.com/jira/browse/JBCACHE-807
>             Project: JBoss Cache
>          Issue Type: Task
>      Security Level: Public(Everyone can see) 
>            Reporter: Brian Stansberry
>         Assigned To: Manik Surtani
>             Fix For: 2.0.0.GA, 2.0.0.CR1
>
>
> We often discuss that FileCacheLoader is not appropriate for many production use cases.  But this is not indicated in the formal docs.  We need to discuss this in the docbook docs, and at least touch on it in the class javadoc for FileCacheLoader.

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: http://jira.jboss.com/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira