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From "aliaksandr shpak (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JCR-2822) Deadlock on cluster during making changes on content repository
Date Thu, 25 Nov 2010 15:25:13 GMT

     [ https://issues.apache.org/jira/browse/JCR-2822?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

aliaksandr shpak updated JCR-2822:
----------------------------------

    Description: 
Deadlock is possible on cluster during making changes on content repository.
The steps for deadlock are following:

Thread 1 - making some changes on content repository. Code:
  public static void move(final Node node, final Node destNode, final Session session,
            final Boolean versionable) throws ItemNotFoundException, RepositoryException {
        final String path = node.getPath();
        final String name = node.getName();
        final String destPath = destNode.getPath() + FileSystem.SEPARATOR_CHAR + name;
        session.move(path, destPath);
        session.save();

Thread 2 - tries to commit transaction and executes org.apache.jackrabbit.core.TransactionContext.prepare()

What's happened:

Thread 1:
    - Call session.move
    - ..., calls CachingHierarchyManager.nodeRemoved, it locks cacheMonitor
    - thread 2 in this time does sync and executes SharedItemStateManager.externalUpdate,
which occurs write lock
    - thread 1 continues working and tries to occur read lock on SharedItemStateManager.hasItemState,
but write lock is already on thread 2, so thread 1 starts wait

Thread 2:
   - Calls TransactionBoundXAResource.prepare
   - comes to ClusterNode.consume
   - Executes SharedItemStateManager.externalUpdate, where occurs the write lock
   - And finally comes to CachingHierarchyManager.nodeModified, but can't proceed because
of cacheMonitor is already locked by Thread1

Thrace from Thread1:
null	at java.lang.Object.wait(J)V(Native Method)
	- waiting on <0xfffffffe7e84c348> (a EDU.oswego.cs.dl.util.concurrent.Latch)
	at java.lang.Object.wait()V(Object.java:474)
	at EDU.oswego.cs.dl.util.concurrent.Latch.acquire()V(Unknown Source)
	- locked <0xfffffffe7e84c348> (a EDU.oswego.cs.dl.util.concurrent.Latch)
	at org.apache.jackrabbit.core.state.FineGrainedISMLocking.acquireReadLock(Lorg/apache/jackrabbit/core/ItemId;)Lorg/apache/jackrabbit/core/state/ISMLocking$ReadLock;(FineGrainedISMLocking.java:112)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.acquireReadLock(Lorg/apache/jackrabbit/core/ItemId;)Lorg/apache/jackrabbit/core/state/ISMLocking$ReadLock;(SharedItemStateManager.java:1432)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.hasItemState(Lorg/apache/jackrabbit/core/ItemId;)Z(SharedItemStateManager.java:286)
	at org.apache.jackrabbit.core.state.XAItemStateManager.hasItemState(Lorg/apache/jackrabbit/core/ItemId;)Z(XAItemStateManager.java:302)
	at org.apache.jackrabbit.core.state.SessionItemStateManager.hasItemState(Lorg/apache/jackrabbit/core/ItemId;)Z(SessionItemStateManager.java:218)
	at org.apache.jackrabbit.core.HierarchyManagerImpl.hasItemState(Lorg/apache/jackrabbit/core/ItemId;)Z(HierarchyManagerImpl.java:164)
	at org.apache.jackrabbit.core.CachingHierarchyManager.nodeRemoved(Lorg/apache/jackrabbit/core/state/NodeState;Lorg/apache/jackrabbit/spi/Path;Lorg/apache/jackrabbit/core/NodeId;)V(CachingHierarchyManager.java:725)
	at org.apache.jackrabbit.core.CachingHierarchyManager.nodeRemoved(Lorg/apache/jackrabbit/core/state/NodeState;Lorg/apache/jackrabbit/spi/Name;ILorg/apache/jackrabbit/core/NodeId;)V(CachingHierarchyManager.java:455)
	- locked <0xfffffffe63626110> (a java.lang.Object)
	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyNodeRemoved(Lorg/apache/jackrabbit/core/state/NodeState;Lorg/apache/jackrabbit/spi/Name;ILorg/apache/jackrabbit/core/NodeId;)V(StateChangeDispatcher.java:207)
	at org.apache.jackrabbit.core.state.SessionItemStateManager.nodeRemoved(Lorg/apache/jackrabbit/core/state/NodeState;Lorg/apache/jackrabbit/spi/Name;ILorg/apache/jackrabbit/core/NodeId;)V(SessionItemStateManager.java:983)
	at org.apache.jackrabbit.core.state.NodeState.notifyNodeRemoved(Lorg/apache/jackrabbit/core/state/ChildNodeEntry;)V(NodeState.java:924)
	at org.apache.jackrabbit.core.state.NodeState.removeChildNodeEntry(Lorg/apache/jackrabbit/spi/Name;I)Z(NodeState.java:403)
	at org.apache.jackrabbit.core.SessionImpl.move(Ljava/lang/String;Ljava/lang/String;)V(SessionImpl.java:1118)
	at org.apache.jackrabbit.jca.JCASessionHandle.move(Ljava/lang/String;Ljava/lang/String;)V(JCASessionHandle.java:170)
	at mypackage.ContentRepositoryUtil.move(Ljavax/jcr/Node;Ljavax/jcr/Node;Ljavax/jcr/Session;)V(ContentRepositoryUtil.java:163)

Thread 2:
null	at org.apache.jackrabbit.core.CachingHierarchyManager.nodeModified(Lorg/apache/jackrabbit/core/state/NodeState;)V(CachingHierarchyManager.java:306)
	- waiting to lock <0xfffffffe63626110> (a java.lang.Object)
	at org.apache.jackrabbit.core.CachingHierarchyManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(CachingHierarchyManager.java:293)
	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(StateChangeDispatcher.java:111)
	at org.apache.jackrabbit.core.state.SessionItemStateManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(SessionItemStateManager.java:889)
	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(StateChangeDispatcher.java:111)
	at org.apache.jackrabbit.core.state.LocalItemStateManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(LocalItemStateManager.java:452)
	at org.apache.jackrabbit.core.state.XAItemStateManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(XAItemStateManager.java:602)
	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(StateChangeDispatcher.java:111)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(SharedItemStateManager.java:400)
	at org.apache.jackrabbit.core.state.ItemState.notifyStateUpdated()V(ItemState.java:244)
	at org.apache.jackrabbit.core.state.ChangeLog.persisted()V(ChangeLog.java:297)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.doExternalUpdate(Lorg/apache/jackrabbit/core/state/ChangeLog;)V(SharedItemStateManager.java:1209)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.externalUpdate(Lorg/apache/jackrabbit/core/state/ChangeLog;Lorg/apache/jackrabbit/core/observation/EventStateCollection;)V(SharedItemStateManager.java:1132)
	at org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.externalUpdate(Lorg/apache/jackrabbit/core/state/ChangeLog;Ljava/util/List;JLjava/lang/String;)V(RepositoryImpl.java:2193)
	at org.apache.jackrabbit.core.cluster.ClusterNode.process(Lorg/apache/jackrabbit/core/cluster/ChangeLogRecord;)V(ClusterNode.java:869)
	at org.apache.jackrabbit.core.cluster.ChangeLogRecord.process(Lorg/apache/jackrabbit/core/cluster/ClusterRecordProcessor;)V(ChangeLogRecord.java:507)
	at org.apache.jackrabbit.core.cluster.ClusterNode.consume(Lorg/apache/jackrabbit/core/journal/Record;)V(ClusterNode.java:815)
	at org.apache.jackrabbit.core.journal.AbstractJournal.doSync(J)V(AbstractJournal.java:214)
	at org.apache.jackrabbit.core.journal.AbstractJournal.lockAndSync()V(AbstractJournal.java:258)
	at org.apache.jackrabbit.core.journal.DefaultRecordProducer.append()Lorg/apache/jackrabbit/core/journal/Record;(DefaultRecordProducer.java:51)
	at org.apache.jackrabbit.core.cluster.ClusterNode$WorkspaceUpdateChannel.updateCreated(Lorg/apache/jackrabbit/core/cluster/Update;)V(ClusterNode.java:602)
	at org.apache.jackrabbit.core.state.SharedItemStateManager$Update.begin()V(SharedItemStateManager.java:554)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.beginUpdate(Lorg/apache/jackrabbit/core/state/ChangeLog;Lorg/apache/jackrabbit/core/observation/EventStateCollectionFactory;Lorg/apache/jackrabbit/core/virtual/VirtualItemStateProvider;)Lorg/apache/jackrabbit/core/state/SharedItemStateManager$Update;(SharedItemStateManager.java:1085)
	at org.apache.jackrabbit.core.state.XAItemStateManager.prepare(Lorg/apache/jackrabbit/core/TransactionContext;)V(XAItemStateManager.java:163)
	at org.apache.jackrabbit.core.TransactionContext.prepare()V(TransactionContext.java:153)
	- locked <0xfffffffe7e4b17a8> (a org.apache.jackrabbit.core.TransactionContext)
	at org.apache.jackrabbit.core.XASessionImpl.prepare(Ljavax/transaction/xa/Xid;)I(XASessionImpl.java:331)
	at org.apache.jackrabbit.jca.TransactionBoundXAResource.prepare(Ljavax/transaction/xa/Xid;)I(TransactionBoundXAResource.java:68)
	at mypackage.XAResourceWrapper.prepare()I(XAResourceWrapper.java:61)



repository.xml:
<?xml version="1.0"?>
<Repository>
		<FileSystem class="mypackage.OracleFileSystem">
		<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
		<param name="url"
			value="jdbc:oracle:thin:@loclhost" />
		<param name="user" value="" />
		<param name="password" value="" />
		<param name="schema" value="oracle" />
			<param name="schemaObjectPrefix" value="PREF_" />
		</FileSystem>
	<Security appName="Jackrabbit">
		<AccessManager
			class="org.apache.jackrabbit.core.security.simple.SimpleAccessManager">
		</AccessManager>
		<LoginModule class="org.apache.jackrabbit.core.security.SimpleLoginModule">
			<param name="anonymousId" value="anonymous" />
		</LoginModule>
	</Security>
	<Workspaces rootPath="${rep.home}/workspaces"
		defaultWorkspace="default" />
	<Workspace name="${wsp.name}">
		<FileSystem class="mypackage.OracleFileSystem">
			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
			<param name="url"
				value="jdbc:oracle:thin:@loclhost" />
			<param name="user" value="" />
			<param name="password" value="" />
			<param name="schema" value="oracle" />
			<param name="schemaObjectPrefix" value="PREF_" />
		</FileSystem>
		<PersistenceManager
			class="mypackage.OracleBundlePersistenceManager">
			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
			<param name="url"
				value="jdbc:oracle:thin:@loclhost" />
			<param name="user" value="" />
			<param name="password" value="" />
			<param name="schema" value="oracle" />
			<param name="schemaObjectPrefix" value="P_${wsp.name}_" />
		</PersistenceManager>
		<ISMLocking class="org.apache.jackrabbit.core.state.FineGrainedISMLocking"/> 
	</Workspace>

	<Versioning rootPath="${rep.home}/version">
		<FileSystem class="mypackage.OracleFileSystem">
			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
			<param name="url"
				value="jdbc:oracle:thin:@localhost" />
			<param name="user" value="" />
			<param name="password" value="" />
			<param name="schema" value="oracle" />
			<param name="schemaObjectPrefix" value="P_V_" />
		</FileSystem>
		<PersistenceManager
			class="mypackage.OracleBundlePersistenceManager">
			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
			<param name="url"
				value="jdbc:oracle:thin:@localhost" />
			<param name="user" value="" />
			<param name="password" value="" />
			<param name="schema" value="oracle" />
			<param name="schemaObjectPrefix" value="P_V_" />
		</PersistenceManager>

		<ISMLocking class="org.apache.jackrabbit.core.state.FineGrainedISMLocking"/>
	</Versioning>
	<DataStore class="org.apache.jackrabbit.core.data.db.DbDataStore">
		<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
		<param name="url"
			value="jdbc:oracle:thin:@localhost" />
		<param name="user" value="" />
		<param name="password" value="" />
		<param name="databaseType" value="oracle" />
        <param name="maxConnections" value="50" />
		<param name="tablePrefix" value="SO_CM_"/>
	</DataStore>
	
	<Cluster id="node1" syncDelay="2000">
		<Journal class="org.apache.jackrabbit.core.journal.OracleDatabaseJournal">
			<param name="revision" value="${rep.home}/revision.log" />
			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
			<param name="url" value="jdbc:oracle:thin:@localhost" />
			<param name="user" value="" />
			<param name="password" value=""/>
            <param name="schemaObjectPrefix" value="PREF_" />
		</Journal>
	</Cluster>
</Repository>

  was:
Deadlock is possible on cluster during making changes on content repository.
The steps for deadlock are following:

Thread 1 - making some changes on content repository. Code:
  public static void move(final Node node, final Node destNode, final Session session,
            final Boolean versionable) throws ItemNotFoundException, RepositoryException {
        final String path = node.getPath();
        final String name = node.getName();
        final String destPath = destNode.getPath() + FileSystem.SEPARATOR_CHAR + name;
        session.move(path, destPath);
        session.save();

Thread 2 - tries to commit transaction and executes org.apache.jackrabbit.core.TransactionContext.prepare()

What's happened:

Thread 1:
    - Call session.move
    - ..., calls CachingHierarchyManager.nodeRemoved, it locks cacheMonitor
    - thread 2 in this time does sync and executes SharedItemStateManager.externalUpdate,
which occurs write lock
    - thread 1 continues working and tries to occur read lock on SharedItemStateManager.hasItemState,
but write lock is already on thread 2, so thread 1 starts wait

Thread 2:
   - Calls TransactionBoundXAResource.prepare
   - comes to ClusterNode.consume
   - Executes SharedItemStateManager.externalUpdate, where occurs the write lock
   - And finally comes to CachingHierarchyManager.nodeModified, but can't proceed because
of cacheMonitor is already locked by Thread1

Thrace from Thread1:
null	at java.lang.Object.wait(J)V(Native Method)
	- waiting on <0xfffffffe7e84c348> (a EDU.oswego.cs.dl.util.concurrent.Latch)
	at java.lang.Object.wait()V(Object.java:474)
	at EDU.oswego.cs.dl.util.concurrent.Latch.acquire()V(Unknown Source)
	- locked <0xfffffffe7e84c348> (a EDU.oswego.cs.dl.util.concurrent.Latch)
	at org.apache.jackrabbit.core.state.FineGrainedISMLocking.acquireReadLock(Lorg/apache/jackrabbit/core/ItemId;)Lorg/apache/jackrabbit/core/state/ISMLocking$ReadLock;(FineGrainedISMLocking.java:112)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.acquireReadLock(Lorg/apache/jackrabbit/core/ItemId;)Lorg/apache/jackrabbit/core/state/ISMLocking$ReadLock;(SharedItemStateManager.java:1432)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.hasItemState(Lorg/apache/jackrabbit/core/ItemId;)Z(SharedItemStateManager.java:286)
	at org.apache.jackrabbit.core.state.XAItemStateManager.hasItemState(Lorg/apache/jackrabbit/core/ItemId;)Z(XAItemStateManager.java:302)
	at org.apache.jackrabbit.core.state.SessionItemStateManager.hasItemState(Lorg/apache/jackrabbit/core/ItemId;)Z(SessionItemStateManager.java:218)
	at org.apache.jackrabbit.core.HierarchyManagerImpl.hasItemState(Lorg/apache/jackrabbit/core/ItemId;)Z(HierarchyManagerImpl.java:164)
	at org.apache.jackrabbit.core.CachingHierarchyManager.nodeRemoved(Lorg/apache/jackrabbit/core/state/NodeState;Lorg/apache/jackrabbit/spi/Path;Lorg/apache/jackrabbit/core/NodeId;)V(CachingHierarchyManager.java:725)
	at org.apache.jackrabbit.core.CachingHierarchyManager.nodeRemoved(Lorg/apache/jackrabbit/core/state/NodeState;Lorg/apache/jackrabbit/spi/Name;ILorg/apache/jackrabbit/core/NodeId;)V(CachingHierarchyManager.java:455)
	- locked <0xfffffffe63626110> (a java.lang.Object)
	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyNodeRemoved(Lorg/apache/jackrabbit/core/state/NodeState;Lorg/apache/jackrabbit/spi/Name;ILorg/apache/jackrabbit/core/NodeId;)V(StateChangeDispatcher.java:207)
	at org.apache.jackrabbit.core.state.SessionItemStateManager.nodeRemoved(Lorg/apache/jackrabbit/core/state/NodeState;Lorg/apache/jackrabbit/spi/Name;ILorg/apache/jackrabbit/core/NodeId;)V(SessionItemStateManager.java:983)
	at org.apache.jackrabbit.core.state.NodeState.notifyNodeRemoved(Lorg/apache/jackrabbit/core/state/ChildNodeEntry;)V(NodeState.java:924)
	at org.apache.jackrabbit.core.state.NodeState.removeChildNodeEntry(Lorg/apache/jackrabbit/spi/Name;I)Z(NodeState.java:403)
	at org.apache.jackrabbit.core.SessionImpl.move(Ljava/lang/String;Ljava/lang/String;)V(SessionImpl.java:1118)
	at org.apache.jackrabbit.jca.JCASessionHandle.move(Ljava/lang/String;Ljava/lang/String;)V(JCASessionHandle.java:170)
	at mypackage.ContentRepositoryUtil.move(Ljavax/jcr/Node;Ljavax/jcr/Node;Ljavax/jcr/Session;)V(ContentRepositoryUtil.java:163)

Thread 2:
null	at org.apache.jackrabbit.core.CachingHierarchyManager.nodeModified(Lorg/apache/jackrabbit/core/state/NodeState;)V(CachingHierarchyManager.java:306)
	- waiting to lock <0xfffffffe63626110> (a java.lang.Object)
	at org.apache.jackrabbit.core.CachingHierarchyManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(CachingHierarchyManager.java:293)
	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(StateChangeDispatcher.java:111)
	at org.apache.jackrabbit.core.state.SessionItemStateManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(SessionItemStateManager.java:889)
	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(StateChangeDispatcher.java:111)
	at org.apache.jackrabbit.core.state.LocalItemStateManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(LocalItemStateManager.java:452)
	at org.apache.jackrabbit.core.state.XAItemStateManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(XAItemStateManager.java:602)
	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(StateChangeDispatcher.java:111)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(SharedItemStateManager.java:400)
	at org.apache.jackrabbit.core.state.ItemState.notifyStateUpdated()V(ItemState.java:244)
	at org.apache.jackrabbit.core.state.ChangeLog.persisted()V(ChangeLog.java:297)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.doExternalUpdate(Lorg/apache/jackrabbit/core/state/ChangeLog;)V(SharedItemStateManager.java:1209)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.externalUpdate(Lorg/apache/jackrabbit/core/state/ChangeLog;Lorg/apache/jackrabbit/core/observation/EventStateCollection;)V(SharedItemStateManager.java:1132)
	at org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.externalUpdate(Lorg/apache/jackrabbit/core/state/ChangeLog;Ljava/util/List;JLjava/lang/String;)V(RepositoryImpl.java:2193)
	at org.apache.jackrabbit.core.cluster.ClusterNode.process(Lorg/apache/jackrabbit/core/cluster/ChangeLogRecord;)V(ClusterNode.java:869)
	at org.apache.jackrabbit.core.cluster.ChangeLogRecord.process(Lorg/apache/jackrabbit/core/cluster/ClusterRecordProcessor;)V(ChangeLogRecord.java:507)
	at org.apache.jackrabbit.core.cluster.ClusterNode.consume(Lorg/apache/jackrabbit/core/journal/Record;)V(ClusterNode.java:815)
	at org.apache.jackrabbit.core.journal.AbstractJournal.doSync(J)V(AbstractJournal.java:214)
	at org.apache.jackrabbit.core.journal.AbstractJournal.lockAndSync()V(AbstractJournal.java:258)
	at org.apache.jackrabbit.core.journal.DefaultRecordProducer.append()Lorg/apache/jackrabbit/core/journal/Record;(DefaultRecordProducer.java:51)
	at org.apache.jackrabbit.core.cluster.ClusterNode$WorkspaceUpdateChannel.updateCreated(Lorg/apache/jackrabbit/core/cluster/Update;)V(ClusterNode.java:602)
	at org.apache.jackrabbit.core.state.SharedItemStateManager$Update.begin()V(SharedItemStateManager.java:554)
	at org.apache.jackrabbit.core.state.SharedItemStateManager.beginUpdate(Lorg/apache/jackrabbit/core/state/ChangeLog;Lorg/apache/jackrabbit/core/observation/EventStateCollectionFactory;Lorg/apache/jackrabbit/core/virtual/VirtualItemStateProvider;)Lorg/apache/jackrabbit/core/state/SharedItemStateManager$Update;(SharedItemStateManager.java:1085)
	at org.apache.jackrabbit.core.state.XAItemStateManager.prepare(Lorg/apache/jackrabbit/core/TransactionContext;)V(XAItemStateManager.java:163)
	at org.apache.jackrabbit.core.TransactionContext.prepare()V(TransactionContext.java:153)
	- locked <0xfffffffe7e4b17a8> (a org.apache.jackrabbit.core.TransactionContext)
	at org.apache.jackrabbit.core.XASessionImpl.prepare(Ljavax/transaction/xa/Xid;)I(XASessionImpl.java:331)
	at org.apache.jackrabbit.jca.TransactionBoundXAResource.prepare(Ljavax/transaction/xa/Xid;)I(TransactionBoundXAResource.java:68)
	at mypackage.XAResourceWrapper.prepare()I(XAResourceWrapper.java:61)



repository.xml:
<?xml version="1.0"?>
<Repository>
		<FileSystem class="mypackage.OracleFileSystem">
		<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
		<param name="url"
			value="jdbc:oracle:thin:@loclhost" />
		<param name="user" value="" />
		<param name="password" value="" />
		<param name="schema" value="oracle" />
			<param name="schemaObjectPrefix" value="PREF_" />
		</FileSystem>
	<Security appName="Jackrabbit">
		<AccessManager
			class="org.apache.jackrabbit.core.security.simple.SimpleAccessManager">
		</AccessManager>
		<LoginModule class="org.apache.jackrabbit.core.security.SimpleLoginModule">
			<param name="anonymousId" value="anonymous" />
		</LoginModule>
	</Security>
	<Workspaces rootPath="${rep.home}/workspaces"
		defaultWorkspace="default" />
	<Workspace name="${wsp.name}">
		<FileSystem class="mypackage.OracleFileSystem">
			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
			<param name="url"
				value="jdbc:oracle:thin:@loclhost" />
			<param name="user" value="" />
			<param name="password" value="" />
			<param name="schema" value="oracle" />
			<param name="schemaObjectPrefix" value="PREF_" />
		</FileSystem>
		<PersistenceManager
			class="mypackage.OracleBundlePersistenceManager">
			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
			<param name="url"
				value="jdbc:oracle:thin:@loclhost" />
			<param name="user" value="" />
			<param name="password" value="" />
			<param name="schema" value="oracle" />
			<param name="schemaObjectPrefix" value="P_${wsp.name}_" />
		</PersistenceManager>
		<ISMLocking class="org.apache.jackrabbit.core.state.FineGrainedISMLocking"/> 
	</Workspace>

	<Versioning rootPath="${rep.home}/version">
		<FileSystem class="mypackage.OracleFileSystem">
			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
			<param name="url"
				value="jdbc:oracle:thin:@localhost" />
			<param name="user" value="" />
			<param name="password" value="" />
			<param name="schema" value="oracle" />
			<param name="schemaObjectPrefix" value="P_V_" />
		</FileSystem>
		<PersistenceManager
			class="mypackage.OracleBundlePersistenceManager">
			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
			<param name="url"
				value="jdbc:oracle:thin:@localhost" />
			<param name="user" value="" />
			<param name="password" value="" />
			<param name="schema" value="oracle" />
			<param name="schemaObjectPrefix" value="P_V_" />
		</PersistenceManager>

		<ISMLocking class="org.apache.jackrabbit.core.state.FineGrainedISMLocking"/>
	</Versioning>
	<DataStore class="org.apache.jackrabbit.core.data.db.DbDataStore">
		<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
		<param name="url"
			value="jdbc:oracle:thin:@localhost" />
		<param name="user" value="TEST" />
		<param name="password" value="abc123" />
		<param name="databaseType" value="oracle" />
        <param name="maxConnections" value="50" />
		<param name="tablePrefix" value="SO_CM_"/>
	</DataStore>
	
	<Cluster id="node1" syncDelay="2000">
		<Journal class="org.apache.jackrabbit.core.journal.OracleDatabaseJournal">
			<param name="revision" value="${rep.home}/revision.log" />
			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
			<param name="url" value="jdbc:oracle:thin:@localhost" />
			<param name="user" value="" />
			<param name="password" value=""/>
            <param name="schemaObjectPrefix" value="PREF_" />
		</Journal>
	</Cluster>
</Repository>


> Deadlock on cluster during making changes on content repository
> ---------------------------------------------------------------
>
>                 Key: JCR-2822
>                 URL: https://issues.apache.org/jira/browse/JCR-2822
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: clustering, jackrabbit-core
>    Affects Versions: 1.6.4
>         Environment: - JEE Web application with parallel web sessions
> - Several clusters of JEE server
> - Oracle database
>            Reporter: aliaksandr shpak
>
> Deadlock is possible on cluster during making changes on content repository.
> The steps for deadlock are following:
> Thread 1 - making some changes on content repository. Code:
>   public static void move(final Node node, final Node destNode, final Session session,
>             final Boolean versionable) throws ItemNotFoundException, RepositoryException
{
>         final String path = node.getPath();
>         final String name = node.getName();
>         final String destPath = destNode.getPath() + FileSystem.SEPARATOR_CHAR + name;
>         session.move(path, destPath);
>         session.save();
> Thread 2 - tries to commit transaction and executes org.apache.jackrabbit.core.TransactionContext.prepare()
> What's happened:
> Thread 1:
>     - Call session.move
>     - ..., calls CachingHierarchyManager.nodeRemoved, it locks cacheMonitor
>     - thread 2 in this time does sync and executes SharedItemStateManager.externalUpdate,
which occurs write lock
>     - thread 1 continues working and tries to occur read lock on SharedItemStateManager.hasItemState,
but write lock is already on thread 2, so thread 1 starts wait
> Thread 2:
>    - Calls TransactionBoundXAResource.prepare
>    - comes to ClusterNode.consume
>    - Executes SharedItemStateManager.externalUpdate, where occurs the write lock
>    - And finally comes to CachingHierarchyManager.nodeModified, but can't proceed because
of cacheMonitor is already locked by Thread1
> Thrace from Thread1:
> null	at java.lang.Object.wait(J)V(Native Method)
> 	- waiting on <0xfffffffe7e84c348> (a EDU.oswego.cs.dl.util.concurrent.Latch)
> 	at java.lang.Object.wait()V(Object.java:474)
> 	at EDU.oswego.cs.dl.util.concurrent.Latch.acquire()V(Unknown Source)
> 	- locked <0xfffffffe7e84c348> (a EDU.oswego.cs.dl.util.concurrent.Latch)
> 	at org.apache.jackrabbit.core.state.FineGrainedISMLocking.acquireReadLock(Lorg/apache/jackrabbit/core/ItemId;)Lorg/apache/jackrabbit/core/state/ISMLocking$ReadLock;(FineGrainedISMLocking.java:112)
> 	at org.apache.jackrabbit.core.state.SharedItemStateManager.acquireReadLock(Lorg/apache/jackrabbit/core/ItemId;)Lorg/apache/jackrabbit/core/state/ISMLocking$ReadLock;(SharedItemStateManager.java:1432)
> 	at org.apache.jackrabbit.core.state.SharedItemStateManager.hasItemState(Lorg/apache/jackrabbit/core/ItemId;)Z(SharedItemStateManager.java:286)
> 	at org.apache.jackrabbit.core.state.XAItemStateManager.hasItemState(Lorg/apache/jackrabbit/core/ItemId;)Z(XAItemStateManager.java:302)
> 	at org.apache.jackrabbit.core.state.SessionItemStateManager.hasItemState(Lorg/apache/jackrabbit/core/ItemId;)Z(SessionItemStateManager.java:218)
> 	at org.apache.jackrabbit.core.HierarchyManagerImpl.hasItemState(Lorg/apache/jackrabbit/core/ItemId;)Z(HierarchyManagerImpl.java:164)
> 	at org.apache.jackrabbit.core.CachingHierarchyManager.nodeRemoved(Lorg/apache/jackrabbit/core/state/NodeState;Lorg/apache/jackrabbit/spi/Path;Lorg/apache/jackrabbit/core/NodeId;)V(CachingHierarchyManager.java:725)
> 	at org.apache.jackrabbit.core.CachingHierarchyManager.nodeRemoved(Lorg/apache/jackrabbit/core/state/NodeState;Lorg/apache/jackrabbit/spi/Name;ILorg/apache/jackrabbit/core/NodeId;)V(CachingHierarchyManager.java:455)
> 	- locked <0xfffffffe63626110> (a java.lang.Object)
> 	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyNodeRemoved(Lorg/apache/jackrabbit/core/state/NodeState;Lorg/apache/jackrabbit/spi/Name;ILorg/apache/jackrabbit/core/NodeId;)V(StateChangeDispatcher.java:207)
> 	at org.apache.jackrabbit.core.state.SessionItemStateManager.nodeRemoved(Lorg/apache/jackrabbit/core/state/NodeState;Lorg/apache/jackrabbit/spi/Name;ILorg/apache/jackrabbit/core/NodeId;)V(SessionItemStateManager.java:983)
> 	at org.apache.jackrabbit.core.state.NodeState.notifyNodeRemoved(Lorg/apache/jackrabbit/core/state/ChildNodeEntry;)V(NodeState.java:924)
> 	at org.apache.jackrabbit.core.state.NodeState.removeChildNodeEntry(Lorg/apache/jackrabbit/spi/Name;I)Z(NodeState.java:403)
> 	at org.apache.jackrabbit.core.SessionImpl.move(Ljava/lang/String;Ljava/lang/String;)V(SessionImpl.java:1118)
> 	at org.apache.jackrabbit.jca.JCASessionHandle.move(Ljava/lang/String;Ljava/lang/String;)V(JCASessionHandle.java:170)
> 	at mypackage.ContentRepositoryUtil.move(Ljavax/jcr/Node;Ljavax/jcr/Node;Ljavax/jcr/Session;)V(ContentRepositoryUtil.java:163)
> Thread 2:
> null	at org.apache.jackrabbit.core.CachingHierarchyManager.nodeModified(Lorg/apache/jackrabbit/core/state/NodeState;)V(CachingHierarchyManager.java:306)
> 	- waiting to lock <0xfffffffe63626110> (a java.lang.Object)
> 	at org.apache.jackrabbit.core.CachingHierarchyManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(CachingHierarchyManager.java:293)
> 	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(StateChangeDispatcher.java:111)
> 	at org.apache.jackrabbit.core.state.SessionItemStateManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(SessionItemStateManager.java:889)
> 	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(StateChangeDispatcher.java:111)
> 	at org.apache.jackrabbit.core.state.LocalItemStateManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(LocalItemStateManager.java:452)
> 	at org.apache.jackrabbit.core.state.XAItemStateManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(XAItemStateManager.java:602)
> 	at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(StateChangeDispatcher.java:111)
> 	at org.apache.jackrabbit.core.state.SharedItemStateManager.stateModified(Lorg/apache/jackrabbit/core/state/ItemState;)V(SharedItemStateManager.java:400)
> 	at org.apache.jackrabbit.core.state.ItemState.notifyStateUpdated()V(ItemState.java:244)
> 	at org.apache.jackrabbit.core.state.ChangeLog.persisted()V(ChangeLog.java:297)
> 	at org.apache.jackrabbit.core.state.SharedItemStateManager.doExternalUpdate(Lorg/apache/jackrabbit/core/state/ChangeLog;)V(SharedItemStateManager.java:1209)
> 	at org.apache.jackrabbit.core.state.SharedItemStateManager.externalUpdate(Lorg/apache/jackrabbit/core/state/ChangeLog;Lorg/apache/jackrabbit/core/observation/EventStateCollection;)V(SharedItemStateManager.java:1132)
> 	at org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.externalUpdate(Lorg/apache/jackrabbit/core/state/ChangeLog;Ljava/util/List;JLjava/lang/String;)V(RepositoryImpl.java:2193)
> 	at org.apache.jackrabbit.core.cluster.ClusterNode.process(Lorg/apache/jackrabbit/core/cluster/ChangeLogRecord;)V(ClusterNode.java:869)
> 	at org.apache.jackrabbit.core.cluster.ChangeLogRecord.process(Lorg/apache/jackrabbit/core/cluster/ClusterRecordProcessor;)V(ChangeLogRecord.java:507)
> 	at org.apache.jackrabbit.core.cluster.ClusterNode.consume(Lorg/apache/jackrabbit/core/journal/Record;)V(ClusterNode.java:815)
> 	at org.apache.jackrabbit.core.journal.AbstractJournal.doSync(J)V(AbstractJournal.java:214)
> 	at org.apache.jackrabbit.core.journal.AbstractJournal.lockAndSync()V(AbstractJournal.java:258)
> 	at org.apache.jackrabbit.core.journal.DefaultRecordProducer.append()Lorg/apache/jackrabbit/core/journal/Record;(DefaultRecordProducer.java:51)
> 	at org.apache.jackrabbit.core.cluster.ClusterNode$WorkspaceUpdateChannel.updateCreated(Lorg/apache/jackrabbit/core/cluster/Update;)V(ClusterNode.java:602)
> 	at org.apache.jackrabbit.core.state.SharedItemStateManager$Update.begin()V(SharedItemStateManager.java:554)
> 	at org.apache.jackrabbit.core.state.SharedItemStateManager.beginUpdate(Lorg/apache/jackrabbit/core/state/ChangeLog;Lorg/apache/jackrabbit/core/observation/EventStateCollectionFactory;Lorg/apache/jackrabbit/core/virtual/VirtualItemStateProvider;)Lorg/apache/jackrabbit/core/state/SharedItemStateManager$Update;(SharedItemStateManager.java:1085)
> 	at org.apache.jackrabbit.core.state.XAItemStateManager.prepare(Lorg/apache/jackrabbit/core/TransactionContext;)V(XAItemStateManager.java:163)
> 	at org.apache.jackrabbit.core.TransactionContext.prepare()V(TransactionContext.java:153)
> 	- locked <0xfffffffe7e4b17a8> (a org.apache.jackrabbit.core.TransactionContext)
> 	at org.apache.jackrabbit.core.XASessionImpl.prepare(Ljavax/transaction/xa/Xid;)I(XASessionImpl.java:331)
> 	at org.apache.jackrabbit.jca.TransactionBoundXAResource.prepare(Ljavax/transaction/xa/Xid;)I(TransactionBoundXAResource.java:68)
> 	at mypackage.XAResourceWrapper.prepare()I(XAResourceWrapper.java:61)
> repository.xml:
> <?xml version="1.0"?>
> <Repository>
> 		<FileSystem class="mypackage.OracleFileSystem">
> 		<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
> 		<param name="url"
> 			value="jdbc:oracle:thin:@loclhost" />
> 		<param name="user" value="" />
> 		<param name="password" value="" />
> 		<param name="schema" value="oracle" />
> 			<param name="schemaObjectPrefix" value="PREF_" />
> 		</FileSystem>
> 	<Security appName="Jackrabbit">
> 		<AccessManager
> 			class="org.apache.jackrabbit.core.security.simple.SimpleAccessManager">
> 		</AccessManager>
> 		<LoginModule class="org.apache.jackrabbit.core.security.SimpleLoginModule">
> 			<param name="anonymousId" value="anonymous" />
> 		</LoginModule>
> 	</Security>
> 	<Workspaces rootPath="${rep.home}/workspaces"
> 		defaultWorkspace="default" />
> 	<Workspace name="${wsp.name}">
> 		<FileSystem class="mypackage.OracleFileSystem">
> 			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
> 			<param name="url"
> 				value="jdbc:oracle:thin:@loclhost" />
> 			<param name="user" value="" />
> 			<param name="password" value="" />
> 			<param name="schema" value="oracle" />
> 			<param name="schemaObjectPrefix" value="PREF_" />
> 		</FileSystem>
> 		<PersistenceManager
> 			class="mypackage.OracleBundlePersistenceManager">
> 			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
> 			<param name="url"
> 				value="jdbc:oracle:thin:@loclhost" />
> 			<param name="user" value="" />
> 			<param name="password" value="" />
> 			<param name="schema" value="oracle" />
> 			<param name="schemaObjectPrefix" value="P_${wsp.name}_" />
> 		</PersistenceManager>
> 		<ISMLocking class="org.apache.jackrabbit.core.state.FineGrainedISMLocking"/>

> 	</Workspace>
> 	<Versioning rootPath="${rep.home}/version">
> 		<FileSystem class="mypackage.OracleFileSystem">
> 			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
> 			<param name="url"
> 				value="jdbc:oracle:thin:@localhost" />
> 			<param name="user" value="" />
> 			<param name="password" value="" />
> 			<param name="schema" value="oracle" />
> 			<param name="schemaObjectPrefix" value="P_V_" />
> 		</FileSystem>
> 		<PersistenceManager
> 			class="mypackage.OracleBundlePersistenceManager">
> 			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
> 			<param name="url"
> 				value="jdbc:oracle:thin:@localhost" />
> 			<param name="user" value="" />
> 			<param name="password" value="" />
> 			<param name="schema" value="oracle" />
> 			<param name="schemaObjectPrefix" value="P_V_" />
> 		</PersistenceManager>
> 		<ISMLocking class="org.apache.jackrabbit.core.state.FineGrainedISMLocking"/>
> 	</Versioning>
> 	<DataStore class="org.apache.jackrabbit.core.data.db.DbDataStore">
> 		<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
> 		<param name="url"
> 			value="jdbc:oracle:thin:@localhost" />
> 		<param name="user" value="" />
> 		<param name="password" value="" />
> 		<param name="databaseType" value="oracle" />
>         <param name="maxConnections" value="50" />
> 		<param name="tablePrefix" value="SO_CM_"/>
> 	</DataStore>
> 	
> 	<Cluster id="node1" syncDelay="2000">
> 		<Journal class="org.apache.jackrabbit.core.journal.OracleDatabaseJournal">
> 			<param name="revision" value="${rep.home}/revision.log" />
> 			<param name="driver" value="oracle.jdbc.driver.OracleDriver" />
> 			<param name="url" value="jdbc:oracle:thin:@localhost" />
> 			<param name="user" value="" />
> 			<param name="password" value=""/>
>             <param name="schemaObjectPrefix" value="PREF_" />
> 		</Journal>
> 	</Cluster>
> </Repository>

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