Datacache lock problems

Hi,
I am having problems when I use the datacache.
I have set the following properties as explained in the manual:
com.solarmetric.kodo.DataCacheClass:
com.solarmetric.kodo.runtime.datacache.plugins.CacheImpl
com.solarmetric.kodo.RemoteCommitProviderClass:
com.solarmetric.kodo.runtime.event.impl.SingleJVMRemoteCommitProvider
I have 11 threads in my code which do a mixture of reading and writing to
the datastore. Each thread is passed it's own PM using
JDOFactory.getPersistenceManager(). With the data cache on I seem to
sometimes get all my threads locking. I dont understand why. Maybe someone
can tell me what I'm doing wrong.
Stack trace for one thread is:
Object.wait(long) line: not available [native method]
UpgradableReentrantWriterPreferenceRWL$UpgradableWriterLock(Object).wait()
line: 426
UpgradableReentrantWriterPreferenceRWL$UpgradableWriterLock(WriterPreferenceReadWriteLock$WriterLock).acquire()
line: 249
UpgradableReentrantWriterPreferenceRWL$UpgradableWriterLock.acquire()
line: 83
CacheImpl(AbstractCacheImpl).acquireWriteLock() line: 411
TimedDataCache.acquireWriteLock() line: 268
DataCacheStoreManager.commit() line: 270
PersistenceManagerImpl.endTransaction(boolean) line: 796
PersistenceManagerImpl.commit() line: 476
TradeFactory.getTrade(PersistenceManager, ProductType, Currency, long,
double, Date, Date) line: 50
Another is:
Object.wait(long) line: not available [native method]
WriterPreferenceReadWriteLock$ReaderLock(Object).wait() line: 426 [local
variables unavailable]
WriterPreferenceReadWriteLock$ReaderLock.acquire() line: 169
CacheImpl(AbstractCacheImpl).acquireReadLock() line: 384
TimedDataCache.acquireReadLock() line: 256
TimedDataCache.containsKey(Object) line: 176
DataCacheStoreManager.exists(Object, ClassMetaData) line: 478
PersistenceManagerImpl.getObjectByIdFilter(Object, Object, boolean,
boolean, boolean) line: 1243
PersistenceManagerImpl.getObjectById(Object, boolean) line: 1179
CacheAwareQuery$CachedResultList.get(int) line: 432
AbstractList$Itr.next() line: 416 [local variables unavailable]
ProductFactory.getProduct(PersistenceManager, String) line: 43
The other threads are all stopped on the following code
Transaction tx = pm.currentTransaction();
apart from one thread which is locked on iterating through an extent.
Regards,
Menno

Can you post a full thread dump for all threads, including full class
names etc., or send it to [email protected]?
-Patrick
On Tue, 02 Sep 2003 13:56:20 +0000, Menno wrote:
Patrick Linskey wrote:
Also, where is the extent-iteration lock happening?I'm running version 2.5.3 but it also happened with 2.5.2.
The iteration lock is actually on a query.
The stack is:
CachingRandomAccessList.get(int) line: 139
AbstractList$Itr.next() line: 416
LimitFactory.getLimit(PersistenceManager, ProductType, Currency) line: 44
The code is as follows:
          Transaction tx = pm.currentTransaction();
          tx.begin();
          String id = p.getProductname() + ":" + c.getName();
          String Filter = "name == id";
          Query q = pm.newQuery(Limit.class,Filter);
          q.declareParameters("String id");
          Collection res = (Collection) q.execute(id);
          Limit l = null;
          Iterator I = res.iterator();
          if( I.hasNext() )
               l = (Limit)I.next(); // locks here
...more code--
Patrick Linskey
SolarMetric Inc.

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