Hibernate Search不释放数据库会话

Question

我们使用Hibernate搜索（版本3.1）和Lucene（版本2.4）来索引Jboss 7.2上运行的内容。数据库团队报告了巨大的数据库会话峰值。他们报告说，在提供少量请求后，db会话进入空闲状这是代码：

public void updateDocumentByIds(IndexMessage indexMessage, java.io.Serializable[] entityPKs,FullTextSession session, boolean isSelfRebuild) throws AAException
{
if (indexMessage.getServProvCode() == null && indexMessage.getSourceNumber() == null) {
logger.error("Agency Code and Source Number are null!");
return;
}
TransactionManager transactionManager = null;
boolean isNewTransaction = false;
FullTextSession searchSession = session;
try
{
IIndexAdapter indexAdapter = IndexAdapter.getIndexAdapter(indexMessage.getEntityType());

IndexDirectoryManager directoryManager = IndexDirectoryManager.getInstance();
String specifyIndexName = directoryManager.getSpecifyIndexName(indexMessage.getServProvCode());

if (searchSession == null)
{
transactionManager = getTransactionManager();
transactionManager.begin();
entityManager = getEntityManager();
Session hibernateSession = (Session) entityManager.getDelegate();
searchSession = SwitchSession.getFullTextSession(hibernateSession, specifyIndexName);
searchSession.setFlushMode(FlushMode.MANUAL); // disable flush operations
searchSession.setCacheMode(CacheMode.IGNORE); // disable 2nd level cache operations
isNewTransaction = true;
}
AgencyModel agencyModel = null;
if (indexMessage.getServProvCode() != null)
{
agencyModel = getAgencyByAgencyCode(searchSession, indexMessage.getServProvCode().toUpperCase());

if (agencyModel == null)
{
logger.warn("No such agency:" + indexMessage.getServProvCode());
return;
}
}
else if (indexMessage.getSourceNumber() == null)
{
logger.warn("Please specify one Agency Code or Source Number!");
return;
}

directoryManager.chooseSyncOrSearchDirectory(specifyIndexName, indexMessage.getEntityType(),
ActionType.SYNC);

for (java.io.Serializable entityPK : entityPKs)
{
try
{
logger.info("========Start Update Index==========");
logger.info("Entity Type: " + indexMessage.getEntityType());
logger.info("Primary Key: " + entityPK.toString());
Object object = indexAdapter.getObjectByPK(searchSession, entityPK, agencyModel);
if (object == null)
{
// Remove index when the data was deleted from DB
searchSession.purge(EntityMapHelper.getEntityClass(indexMessage.getEntityType()), entityPK);
}
else
{
// Update Index when this entity can be found in DB
searchSession.index(object);
}

// While the related index is rebuilding, this record need be tracked into a LOG table.
if (!isSelfRebuild
&& directoryManager.needTrackForSync(searchSession, specifyIndexName, indexMessage
.getEntityType()))
{
saveToUnindexedData(indexMessage, indexMessage.getServProvCode(), entityPK);
}

logger.info("============ End Now =================\n");
}
catch (Exception e)
{
logger.error("Exception occured during update index for " + specifyIndexName + "/"
+ entityPK.toString(), e);

continue;
}
}
searchSession.flushToIndexes();
searchSession.clear();
if (isNewTransaction)
{
commit(entityManager, searchSession, transactionManager);
transactionManager = null;
}
}
catch (Exception e)
{
throw new SyncIndexException("", e);
}
finally
{
if (transactionManager != null)
{
try
{
transactionManager.rollback();
}
catch (Exception e)
{
;
}
}
IndexDirectoryThreadLocal.remove();
}
}

注意：这下面用于单元测试的Hibernate EntityManagerFactory配置

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="packagesToScan" value="com.comp" />
<property name="persistenceProviderClass" value="com.comp.orm.hibernate3.compHibernatePersistence" />   
<property name="dataSource" ref="dataSource" />
<property name="persistenceUnitName" value="AAPU"/>
<property name="jpaPropertyMap">
<map>
<entry key="hibernate.show_sql"
value="false"/>
<entry key="hibernate.format_sql"
value="true"/>
<entry key="use_sql_comments"
value="true"/>   
<entry key="hibernate.bytecode.use_reflection_optimizer"
value="true"/>
<entry key="hibernate.max_fetch_depth"
value="1"/>
<entry key="hibernate.default_batch_fetch_size"
value="30"/>   
<entry key="hibernate.jdbc.fetch_size"
value="30"/>  
<entry key="hibernate.jdbc.batch_size"
value="15"/> 
<entry key="hibernate.cache.use_second_level_cache"
value="false"/>     
<entry key="hibernate.jdbc.use_scrollable_resultset"
value="true"/> 
<entry key="hibernate.temp.use_jdbc_metadata_defaults"
value="false"/> 
<entry key="hibernate.jdbc.factory_class"
value="org.hibernate.jdbc.BatchingBatcherFactory"/> 
<entry key="hibernate.c3p0.min_size"
value="50"/>    
<entry key="hibernate.c3p0.max_size"
value="100"/> 
<entry key="hibernate.c3p0.timeout"
value="120"/> 
<entry key="hibernate.c3p0.max_statements"
value="100"/> 
<entry key="hibernate.c3p0.idle_test_period"
value="3000"/>

<entry key="hibernate.search.default.directory_provider"
value="com.comp.aa.globalsearch.directory.IndexDirectoryProvider"/>
<entry key="hibernate.search.default.indexBase"
value="/index"/>
<entry key="hibernate.search.reader.strategy"
value="com.comp.aa.globalsearch.directory.SwitchReaderProvider"/>
<entry key="hibernate.jdbc.factory_class"
value="org.hibernate.jdbc.BatchingBatcherFactory"/>

<entry key="hibernate.transaction.manager_lookup_class"
value="org.hibernate.transaction.JBossTransactionManagerLookup"/>
<entry key="hibernate.current_session_context_class"
value="jta"/>              
</map>
</property>


<property name="persistenceUnitPostProcessors">
<list>
<bean class="com.comp.orm.util.JtaPersistenceUnitPostProcessor">
<property name="jtaDataSource" ref="dataSource"/>
</bean>             
</list>
</property>
</bean>

在某些论坛中，我看到hibernate.c3p0.idle_test_period应该小于或等于hibernate.c3p0.timeout。我们将这两个值都更改为5分钟，但问题仍然存在

知道为什么db会话空闲吗？