Hi Simon, On Tue, Jun 2, 2009 at 3:33 PM, Simon Droscher < simon.drosc...@elasticpath.com> wrote:
> > Kevin Sutter wrote: > > > > This topic has come up recently due to some potential > > locking issues (serialized access) when reading the metadata repository > in > > a > > multi-threaded environment. > > > > Do you have any details (JIRA issue?) about the locking issues? We are > seeing a lot of locked threads on MetaDataRepository.getMetaData under load > with data caching enabled (OpenJPA 1.2.1) No JIRA Issue yet. We're not experiencing deadlocks, we're just experiencing some serialized access under certain multi-threaded access. I haven't pushed on it yet since we just haven't nailed down the exact scenario yet. Just not enough time... > Is there anything we can do about this? It is reducing our ability to scale > performance. Sorry, I don't know of any work arounds for your situation. And, looking at your call stack, it looks to be a slightly different problem. I also notice that you are using the WebLogic environment. What version of OpenJPA are you using? You mention 1.2.1 above, but I thought WebLogic used the 1.1.x branch of OpenJPA. Thanks, Kevin Here's some of the stack trace: > > > [TDNum36] "[ACTIVE] ExecuteThread: '56' for queue: 'weblogic.kernel.Default > (self-tuning)'" daemon prio=1 tid=0x36a22b20 nid=0x7c1c runnable > [0x25cea000..0x25cecda0] > [TDNum36] at java.lang.Class.isAssignableFrom(Native Method) > [TDNum36] at > > org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:285) > [TDNum36] - locked <0x72d44cb8> (a > org.apache.openjpa.jdbc.meta.MappingRepository) > [TDNum36] at > > org.apache.openjpa.meta.MetaDataRepository.getMetaData(MetaDataRepository.java:994) > [TDNum36] at > > org.apache.openjpa.kernel.BrokerImpl.newStateManagerImpl(BrokerImpl.java:1179) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.findAll(BrokerImpl.java:964) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.findAll(BrokerImpl.java:913) > [TDNum36] at > > org.apache.openjpa.kernel.AbstractPCData.toRelationFields(AbstractPCData.java:225) > [TDNum36] at > > org.apache.openjpa.kernel.AbstractPCData.toNestedFields(AbstractPCData.java:192) > [TDNum36] at > org.apache.openjpa.kernel.AbstractPCData.toField(AbstractPCData.java:78) > [TDNum36] at > org.apache.openjpa.kernel.PCDataImpl.loadField(PCDataImpl.java:197) > [TDNum36] at > org.apache.openjpa.kernel.PCDataImpl.load(PCDataImpl.java:147) > [TDNum36] at > > org.apache.openjpa.datacache.DataCacheStoreManager.initialize(DataCacheStoreManager.java:347) > [TDNum36] at > > org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111) > [TDNum36] at > > org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:894) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:852) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:774) > [TDNum36] at > > org.apache.openjpa.kernel.AbstractPCData.toRelationField(AbstractPCData.java:216) > [TDNum36] at > > org.apache.openjpa.kernel.AbstractPCData.toNestedField(AbstractPCData.java:150) > [TDNum36] at > org.apache.openjpa.kernel.AbstractPCData.toField(AbstractPCData.java:127) > [TDNum36] at > org.apache.openjpa.kernel.PCDataImpl.loadField(PCDataImpl.java:197) > [TDNum36] at > org.apache.openjpa.kernel.PCDataImpl.load(PCDataImpl.java:147) > [TDNum36] at > > org.apache.openjpa.datacache.DataCacheStoreManager.loadAll(DataCacheStoreManager.java:484) > [TDNum36] at > > org.apache.openjpa.kernel.DelegatingStoreManager.loadAll(DelegatingStoreManager.java:121) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.findAll(BrokerImpl.java:984) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.findAll(BrokerImpl.java:913) > [TDNum36] at > > org.apache.openjpa.kernel.AbstractPCData.toRelationFields(AbstractPCData.java:225) > [TDNum36] at > > org.apache.openjpa.kernel.AbstractPCData.toNestedFields(AbstractPCData.java:192) > [TDNum36] at > org.apache.openjpa.kernel.AbstractPCData.toField(AbstractPCData.java:78) > [TDNum36] at > org.apache.openjpa.kernel.PCDataImpl.loadField(PCDataImpl.java:197) > [TDNum36] at > org.apache.openjpa.kernel.PCDataImpl.load(PCDataImpl.java:147) > [TDNum36] at > > org.apache.openjpa.datacache.DataCacheStoreManager.initialize(DataCacheStoreManager.java:347) > [TDNum36] at > > org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111) > [TDNum36] at > > org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:894) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:852) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:774) > [TDNum36] at > > org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:918) > [TDNum36] at > org.apache.openjpa.jdbc.sql.AbstractResult.load(AbstractResult.java:278) > [TDNum36] at > > org.apache.openjpa.jdbc.sql.SelectImpl$SelectResult.load(SelectImpl.java:2400) > [TDNum36] at > > org.apache.openjpa.jdbc.meta.strats.RelationFieldStrategy.loadEagerJoin(RelationFieldStrategy.java:541) > [TDNum36] at > > org.apache.openjpa.jdbc.meta.FieldMapping.loadEagerJoin(FieldMapping.java:807) > [TDNum36] at > > org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:967) > [TDNum36] at > > org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:948) > [TDNum36] at > > org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:927) > [TDNum36] at > > org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initializeState(JDBCStoreManager.java:364) > [TDNum36] at > > org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(JDBCStoreManager.java:278) > [TDNum36] at > > org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111) > [TDNum36] at > > org.apache.openjpa.datacache.DataCacheStoreManager.initialize(DataCacheStoreManager.java:340) > [TDNum36] at > > org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111) > [TDNum36] at > > org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:894) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:852) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:774) > [TDNum36] at > > org.apache.openjpa.kernel.AbstractPCData.toRelationField(AbstractPCData.java:216) > [TDNum36] at > > org.apache.openjpa.kernel.AbstractPCData.toNestedField(AbstractPCData.java:150) > [TDNum36] at > org.apache.openjpa.kernel.AbstractPCData.toField(AbstractPCData.java:127) > [TDNum36] at > org.apache.openjpa.kernel.PCDataImpl.loadField(PCDataImpl.java:197) > [TDNum36] at > org.apache.openjpa.kernel.PCDataImpl.load(PCDataImpl.java:147) > [TDNum36] at > > org.apache.openjpa.datacache.DataCacheStoreManager.initialize(DataCacheStoreManager.java:347) > [TDNum36] at > > org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111) > [TDNum36] at > > org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:894) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:852) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:774) > [TDNum36] at > > org.apache.openjpa.kernel.AbstractPCData.toRelationField(AbstractPCData.java:216) > [TDNum36] at > > org.apache.openjpa.kernel.AbstractPCData.toNestedField(AbstractPCData.java:150) > [TDNum36] at > org.apache.openjpa.kernel.AbstractPCData.toField(AbstractPCData.java:127) > [TDNum36] at > org.apache.openjpa.kernel.PCDataImpl.loadField(PCDataImpl.java:197) > [TDNum36] at > org.apache.openjpa.kernel.PCDataImpl.load(PCDataImpl.java:147) > [TDNum36] at > > org.apache.openjpa.datacache.DataCacheStoreManager.loadAll(DataCacheStoreManager.java:484) > [TDNum36] at > > org.apache.openjpa.kernel.DelegatingStoreManager.loadAll(DelegatingStoreManager.java:121) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.findAll(BrokerImpl.java:984) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.findAll(BrokerImpl.java:913) > [TDNum36] at > > org.apache.openjpa.kernel.AbstractPCData.toRelationFields(AbstractPCData.java:225) > [TDNum36] at > > org.apache.openjpa.kernel.AbstractPCData.toNestedFields(AbstractPCData.java:192) > [TDNum36] at > org.apache.openjpa.kernel.AbstractPCData.toField(AbstractPCData.java:78) > [TDNum36] at > org.apache.openjpa.kernel.PCDataImpl.loadField(PCDataImpl.java:197) > [TDNum36] at > org.apache.openjpa.kernel.PCDataImpl.load(PCDataImpl.java:147) > [TDNum36] at > > org.apache.openjpa.datacache.DataCacheStoreManager.initialize(DataCacheStoreManager.java:347) > [TDNum36] at > > org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111) > [TDNum36] at > > org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:894) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:852) > [TDNum36] at > org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:774) > [TDNum36] at > > org.apache.openjpa.datacache.QueryCacheStoreQuery.fromObjectId(QueryCacheStoreQuery.java:203) > [TDNum36] at > > org.apache.openjpa.datacache.QueryCacheStoreQuery.access$200(QueryCacheStoreQuery.java:58) > [TDNum36] at > > org.apache.openjpa.datacache.QueryCacheStoreQuery$CachedList.get(QueryCacheStoreQuery.java:461) > [TDNum36] at > > org.apache.openjpa.lib.rop.ListResultObjectProvider.getResultObject(ListResultObjectProvider.java:55) > [TDNum36] at > org.apache.openjpa.lib.rop.EagerResultList.<init>(EagerResultList.java:36) > [TDNum36] at > org.apache.openjpa.kernel.QueryImpl.toResult(QueryImpl.java:1228) > [TDNum36] at > org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:990) > [TDNum36] at > org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:805) > [TDNum36] at > org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:775) > [TDNum36] at > org.apache.openjpa.kernel.DelegatingQuery.execute(DelegatingQuery.java:533) > [TDNum36] at > org.apache.openjpa.persistence.QueryImpl.execute(QueryImpl.java:252) > [TDNum36] at > org.apache.openjpa.persistence.QueryImpl.getResultList(QueryImpl.java:294) > > -- > View this message in context: > http://n2.nabble.com/correct-way-to-load-persistent-metadata-at-startup-tp2865060p3014458.html > Sent from the OpenJPA Users mailing list archive at Nabble.com. > 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