Fwd: Non-blocking DataRowStore - need help to test

[Andrus Adamchik <an...@objectstyle.org>]

FYI. 

Figured I'd expand the scope of this pre-announcement to find some volunteers to test the new code. If anyone wants to do it, but can't build Cayenne trunk for some reason ( http://cayenne.apache.org/building-cayenne.html ), let me know. I'll assemble the binaries.

Thanks,
Andrus

Begin forwarded message:
> From: Andrus Adamchik <an...@objectstyle.org>
> Date: February 22, 2012 9:54:41 PM GMT+03:00
> To: dev@cayenne.apache.org
> Subject: Non-blocking DataRowStore - need help to test
> Reply-To: dev@cayenne.apache.org
> 
> Here is a potentially disruptive change to Cayenne core:
> 
> http://svn.apache.org/viewvc?view=revision&revision=1292437
> (also see https://issues.apache.org/jira/browse/CAY-1670 )
> 
> This removes the major global lock and has a potential to significantly increase throughput (which is an issue, see CAY-1124 by Tore for instance). The implementation is based on a previously untried by us data structure - ConcurrentLinkedHashMap - http://code.google.com/p/concurrentlinkedhashmap/ . It is used by Apache Cassandra, so presumably it works and can handle the load. I internalized this code, placing it under org.apache.cayenne.util.concurrentlinkedhashmap.
> 
> I need help with testing though... Maybe someone has any kind of load tests that can emulate multiple DataContexts attached to a single ServerRuntime and performing various select/modify operations? Or maybe you are daring enough to place this in production? I will do the same on my end.
> 
> To give some reassurance, our single-threaded unit tests pass 100% with no changes after I swapped commons-collections LRUMap to ConcurrentLinkedHashMap. 
> 
> Appreciate feedback on this feature!
> 
> Thanks,
> Andrus