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) Is there anything we can do about this? It is reducing our ability to scale performance. 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.
