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Chapter 4. Configuring the Narayana transaction manager

In Fuse, the built-in, global transaction manager is JBoss Narayana Transaction Manager, which is the same transaction manager that is used by Enterprise Application Platform (EAP) 7.

In the OSGi runtime, as in Fuse for Karaf, the additional integration layer is provided by the PAX TRANSX project.

The following topics discuss Narayana configuration:

4.1. About Narayana installation
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The Narayana transaction manager is exposed for use in OSGi bundles under the following interfaces, as well as a few additional support interfaces:

  • javax.transaction.TransactionManager
  • javax.transaction.UserTransaction
  • org.springframework.transaction.PlatformTransactionManager
  • org.ops4j.pax.transx.tm.TransactionManager

The 7.13.0.fuse-7_13_0-00012-redhat-00001 distribution makes these interfaces available from the start.

The pax-transx-tm-narayana feature contains an overridden bundle that embeds Narayana: 

karaf@root()> feature:info pax-transx-tm-narayana
Feature pax-transx-tm-narayana 0.3.0
Feature has no configuration
Feature has no configuration files
Feature depends on:
  pax-transx-tm-api 0.0.0
Feature contains followed bundles:
  mvn:org.jboss.fuse.modules/fuse-pax-transx-tm-narayana/7.0.0.fuse-000191-redhat-1 (overriden from mvn:org.ops4j.pax.transx/pax-transx-tm-narayana/0.3.0)
Feature has no conditionals.
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The services provided by the fuse-pax-transx-tm-narayana bundle are: 

karaf@root()> bundle:services fuse-pax-transx-tm-narayana

Red Hat Fuse :: Fuse Modules :: Transaction (21) provides:
----------------------------------------------------------
[org.osgi.service.cm.ManagedService]
[javax.transaction.TransactionManager]
[javax.transaction.TransactionSynchronizationRegistry]
[javax.transaction.UserTransaction]
[org.jboss.narayana.osgi.jta.ObjStoreBrowserService]
[org.ops4j.pax.transx.tm.TransactionManager]
[org.springframework.transaction.PlatformTransactionManager]
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Because this bundle registers org.osgi.service.cm.ManagedService, it tracks and reacts to the changes in CM configurations: 

karaf@root()> bundle:services -p fuse-pax-transx-tm-narayana

Red Hat Fuse :: Fuse Modules :: Transaction (21) provides:
----------------------------------------------------------
objectClass = [org.osgi.service.cm.ManagedService]
service.bundleid = 21
service.id = 232
service.pid = org.ops4j.pax.transx.tm.narayana
service.scope = singleton
...
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The default org.ops4j.pax.transx.tm.narayana PID is: 

karaf@root()> config:list '(service.pid=org.ops4j.pax.transx.tm.narayana)'
----------------------------------------------------------------
Pid:            org.ops4j.pax.transx.tm.narayana
BundleLocation: ?
Properties:
   com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.communicationStore.localOSRoot = communicationStore
   com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.communicationStore.objectStoreDir = /data/servers/7.13.0.fuse-7_13_0-00012-redhat-00001/data/narayana
   com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.communicationStore.objectStoreType = com.arjuna.ats.internal.arjuna.objectstore.ShadowNoFileLockStore
   com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.localOSRoot = defaultStore
   com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.objectStoreDir = /data/servers/7.13.0.fuse-7_13_0-00012-redhat-00001/data/narayana
   com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.objectStoreType = com.arjuna.ats.internal.arjuna.objectstore.ShadowNoFileLockStore
   com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.stateStore.localOSRoot = stateStore
   com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.stateStore.objectStoreDir = /data/servers/7.13.0.fuse-7_13_0-00012-redhat-00001/data/narayana
   com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.stateStore.objectStoreType = com.arjuna.ats.internal.arjuna.objectstore.ShadowNoFileLockStore
   com.arjuna.ats.arjuna.common.RecoveryEnvironmentBean.recoveryBackoffPeriod = 10
   felix.fileinstall.filename = file:/data/servers/7.13.0.fuse-7_13_0-00012-redhat-00001/etc/org.ops4j.pax.transx.tm.narayana.cfg
   service.pid = org.ops4j.pax.transx.tm.narayana
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In summary:

  • Fuse for Karaf includes the fully-featured, global, Narayana transaction manager.
  • The transaction manager is correctly exposed under various client interfaces (JTA, Spring-tx, PAX JMS).
  • You can configure Narayana by using the standard OSGi method, Configuration Admin, which is available in org.ops4j.pax.transx.tm.narayana.
  • The default configuration is provided in $FUSE_HOME/etc/org.ops4j.pax.transx.tm.narayana.cfg.

4.2. Transaction protocols supported
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The Narayana transaction manager is the JBoss/Red Hat product that is used in EAP. Narayana is a transactions toolkit that provides support for applications that are developed using a broad range of standards-based transaction protocols:

  • JTA
  • JTS
  • Web-Service Transactions
  • REST Transactions
  • STM
  • XATMI/TX

4.3. About Narayana configuration
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The pax-transx-tm-narayana bundle includes the jbossts-properties.xml file, which provides the default configuration of different aspects of the transaction manager. All of these properties may be overriden in the $FUSE_HOME/etc/org.ops4j.pax.transx.tm.narayana.cfg file directly or by using the Configuration Admin API.

The basic configuration of Narayana is done through various EnvironmentBean objects. Every such bean may be configured by using properties with different prefixes. The following table provides a summary of configuration objects and prefixes used:

Expand
Configuration BeanProperty Prefix

com.arjuna.ats.arjuna.common.CoordinatorEnvironmentBean

com.arjuna.ats.arjuna.coordinator

com.arjuna.ats.arjuna.common.CoreEnvironmentBean

com.arjuna.ats.arjuna

com.arjuna.ats.internal.arjuna.objectstore.hornetq.HornetqJournalEnvironmentBean

com.arjuna.ats.arjuna.hornetqjournal

com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean

com.arjuna.ats.arjuna.objectstore

com.arjuna.ats.arjuna.common.RecoveryEnvironmentBean

com.arjuna.ats.arjuna.recovery

com.arjuna.ats.jdbc.common.JDBCEnvironmentBean

com.arjuna.ats.jdbc

com.arjuna.ats.jta.common.JTAEnvironmentBean

com.arjuna.ats.jta

com.arjuna.ats.txoj.common.TxojEnvironmentBean

com.arjuna.ats.txoj.lockstore

The prefix can simplify the configuration. However, you should typically use either of the following formats:

NameEnvironmentBean.propertyName (the preferred format), or

fully-qualified-class-name.field-name

For example, consider the com.arjuna.ats.arjuna.common.CoordinatorEnvironmentBean.commitOnePhase field. It may be configured by using the com.arjuna.ats.arjuna.common.CoordinatorEnvironmentBean.commitOnePhase property or it can be configured by using the simpler (preferred) form CoordinatorEnvironmentBean.commitOnePhase. Full details of how to set properties and which beans can be configured can be found in the Narayana Product Documentation.

Some beans, such as the ObjectStoreEnvironmentBean, may be configured multiple times with each named instance providing configuration for a different purposes. In this case, the name of the instance is used between the prefix (any of the above) and field-name. For example, a type of object store for an ObjectStoreEnvironmentBean instance that is named communicationStore may be configured by using properties that are named:

  • com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.communicationStore.objectStoreType
  • ObjectStoreEnvironmentBean.communicationStore.objectStoreType

4.4. Configuring log storage
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The most important configuration is the type and location of object log storage. There are typically three implementations of the com.arjuna.ats.arjuna.objectstore.ObjectStoreAPI interface:

com.arjuna.ats.internal.arjuna.objectstore.hornetq.HornetqObjectStoreAdaptor
Uses org.apache.activemq.artemis.core.journal.Journal storage from AMQ 7 internally.
com.arjuna.ats.internal.arjuna.objectstore.jdbc.JDBCStore
Uses JDBC to keep TX log files.
com.arjuna.ats.internal.arjuna.objectstore.FileSystemStore (and specialized implementations)
Uses custom file-based log storage.

By default, Fuse uses com.arjuna.ats.internal.arjuna.objectstore.ShadowNoFileLockStore, which is a specialized implementation of FileSystemStore.

There are three stores that are used by Narayana for which transaction/object logs are kept:

  • defaultStore
  • communicationStore
  • stateStore

See State management in Narayana documentation for more details.

The default configuration of these three stores is: 

# default store
com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.objectStoreType = com.arjuna.ats.internal.arjuna.objectstore.ShadowNoFileLockStore
com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.objectStoreDir = ${karaf.data}/narayana
com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.localOSRoot = defaultStore
# communication store
com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.communicationStore.objectStoreType = com.arjuna.ats.internal.arjuna.objectstore.ShadowNoFileLockStore
com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.communicationStore.objectStoreDir = ${karaf.data}/narayana
com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.communicationStore.localOSRoot = communicationStore
# state store
com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.stateStore.objectStoreType = com.arjuna.ats.internal.arjuna.objectstore.ShadowNoFileLockStore
com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.stateStore.objectStoreDir = ${karaf.data}/narayana
com.arjuna.ats.arjuna.common.ObjectStoreEnvironmentBean.stateStore.localOSRoot = stateStore
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ShadowNoFileLockStore is configured with the base directory (objectStoreDir) and the particular store’s directory (localOSRoot).

The many configuration options are contained in the Narayana documentation guide. However, the Narayana documentation states that the canonical reference for configuration options is the Javadoc for the various EnvironmentBean classes.

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