[infinispan-dev] atomic operations for Lucene's LockManager on Infinispan

[Mircea Markus]

On Oct 21, 2009, at 9:50 PM, Sanne Grinovero wrote:

> Hello,
> I've spoken with Manik in IRC about this, so wanted to share this,
> especially because he mentioned to ask someone to help me.
  I've applied the patch and reproduced the failure. Looking into it  
right now.
>
>
> I've been busy writing a lock-stress-test for our implementation for
> Lucene's Lock and Lockfactory, and got some trouble using
>
> cache.putIfAbsent(Object key, Object value);
>
> It appears to not behave atomically as it should.
> I've confirmed the test is working when mocking the cache with a plain
> ConcurrentHashMap, so next step for me is having someone
> with better knowledge of Infinispan core have a look into the code; I
> might have some configuration problem.
>
> My test is attached to ISPN-227, here are some instructions:
> the test to run is
> org.infinispan.lucene.InfinispanLockFactoryStressTest, which creates
> and uses several org.infinispan.lucene.InfinispanLock.
>
> mvn test -Dtest=org.infinispan.lucene.InfinispanLockFactoryStressTest
> -Dbind.address=127.0.0.1 -Djava.net.preferIPv4Stack=true
>
> The test defines 3 different cacheFactory, only one is not commented,
> so please edit the code to try against a different ConcurrentMap
> implementation and see what happens.
> Some status will be sent to system.out.
>
>   * MultiNodeTestCacheFactory emulates different nodes sharing state,
> and each node is having n threads (using Core Infinispan's
> MultipleCacheManagersTest)
>
>   * ConcurrentHashMapCacheTestFactory uses Java's ConcurrentHashMap
>
>   * LocalISPNCacheTestFactory (using
> TestCacheManagerFactory.createLocalCacheManager(false))
>
> This is not intended to be committed for now, just to find out what's
> wrong. Also this is not the Lock implementation as we need it, but
> first this step should be fixed.
>
> thanks,
>
> Sanne
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