Clusted Cache with Berkeley CacheLoader with a singleton wri

[jivesociety]

I was wondering if a configuration with the following properties is possible:
- clusted cache
- Berkeley CacheLoader
- Singleton writer enabled

I'm getting the following exception and was wondering if there was a way to make this work out of the box without creating a custom cacheloader.

Caused by: com.sleepycat.je.log.LogException: (JE 3.2.44) A je.lck file exists in C:\cache\stats The environment can not be locked for single writer access.
at com.sleepycat.je.log.FileManager.lockEnvironment(FileManager.java:1292)
at com.sleepycat.je.log.FileManager.(FileManager.java:185)
at com.sleepycat.je.dbi.EnvironmentImpl.(EnvironmentImpl.java:296)
at com.sleepycat.je.dbi.DbEnvPool.getEnvironment(DbEnvPool.java:102)
at com.sleepycat.je.dbi.DbEnvPool.getEnvironment(DbEnvPool.java:54)
at com.sleepycat.je.Environment.(Environment.java:100)
at org.jboss.cache.loader.bdbje.BdbjeCacheLoader.start(BdbjeCacheLoader.java:171)
at org.jboss.cache.loader.AbstractDelegatingCacheLoader.start(AbstractDelegatingCacheLoader.java:158)
at org.jboss.cache.loader.CacheLoaderManager.startCacheLoader(CacheLoaderManager.java:378)
... 61 more

[manik]

Is C:\cache\stats on a shared drive? Or perhaps a previous process did not end correctly and left a stale je.lck lock file?

[jivesociety]

C:\cache\stats is not a shared drive. But, I was contemplating going that route as we are planning on deploying this to unix systems with a shared NFS filesystem.

It seems that the first process in the cluster creates the je.lck file to signify it is the writer process. And every other node that starts up afterwards throws this error due to that lock file being present.

I might have misconfigured the CacheLoaderConfig, is this configuration allowable though?

thanks in advance,
ray

[manik]

Read http://www.oracle.com/technology/products/berkeley-db/faq/je_faq.html#1 before you think about BDBJE on NFS! :-)

It may just be that BDBJE in a shared environment may not work due to the way the BDBJE engine implements locks.

Have you tried JDBM instead of BDBJE?