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Running two instances of JBoss AS on the same machine
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If you have to run two instances of JBoss AS on the same machine, you ll need to remap some of the ports (including the JNDI port). This process is described on the JBoss wiki, but the following blog post has a concise how-to description: http:// blog.emmanuelbernard.com/2008/08/remotely-send-and-consume-messageswith.html.
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Regardless of the approach you choose, the knowledge you gained from this chapter is still relevant because the technique doesn t fundamentally change the configuration of Hibernate Search. The next step is to make sure slaves get the latest index directory from the master.
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Configuring slave nodes
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10.2.2 Preparing the directory providers
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We discussed how to use DirectoryProviders in a cluster in section 5.1.4. If you want a more detailed explanation of the configuration, refer to chapter 5. We ll simply complete our slave node configuration (see listing 10.2). Let s assume that /mnt/ share is a shared drive where the master node pushes stable versions of the index directories.
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Listing 10.2 Completing the slave node configuration
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<persistence-unit name="dvdstore-catalog"> <jta-data-source>java:/DefaultDS</jta-data-source> <properties> <!-- regular Hibernate Core configuration --> <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/> <property name="hibernate.hbm2ddl.auto" value="create-drop"/> <!-- Hibernate Search configuration --> <!-- JMS backend --> <property name="hibernate.search.worker.jndi.url" value="jnp://master:1099"/> <property name="hibernate.search.worker.backend" value="jms"/> <property name="hibernate.search.worker.jms.connection_factory" value="/ConnectionFactory"/> <property name="hibernate.search.worker.jms.queue" Slave value="queue/hibernatesearch"/> directory <!-- DirectoryProvider configuration --> <property name="hibernate.search.default.directory_provider" value="org.hibernate.search.store.FSSlaveDirectoryProvider"/> <property name="hibernate.search.default.refresh" value="1800"/> <property name="hibernate.search.default.indexBase" value="/Users/prod/lucenedirs"/> <property name="hibernate.search.default.sourceBase" value="/mnt/share"/> Local directory </properties> where indexes are Directory where master </persistence-unit> copied to indexes are read from
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provider
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Copy from the master every 30 minutes
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In this scenario, we read all our indexes from /mnt/share; this directory contains one subdirectory per entity indexed because we use the default Hibernate Search configuration. Every 30 minutes (1800 seconds), the master directories are copied to the local slave.
NOTE
Each DirectoryProvider (one per index) is responsible for copying its master version. This is not a global operation that copies all indexes. For example, you could decide that the distributor index can be copied only every three hours, whereas the item index is copied every 30 minutes.
Scalability: using Hibernate Search in a cluster
The copy is performed asynchronously and doesn t affect queries processed by the slave. When the copy is finished, the new version becomes the one actively used by the slave node. This means that at a given time, your hard drive contains two versions of the index: the active version and the version being copied. These two versions are placed in the index directory under the directories named 1 and 2. The DirectoryProvider determines which directory is the active one. Our slave nodes are configured and ready, but they need the master to do the actual indexing work. Let s see how to configure the master node.
10.3 Configuring the master node
The master is typically a stripped-down version of your application that contains the message consumer (an MDB), your domain model (the Hibernate Search mapping configuration), and the persistence unit (either the SessionFactory or the EntityManagerFactory configuration). The master can alternatively be the complete version of your application and also act like a slave (that is, answering HTTP requests from your customers). Be careful, because the configuration of a master is different than that of the slave. If you deploy the master node but still configure it to use the JMS backend, the MDB will simply consume a message, re-create it, and put it back into the queue. Not so useful.
You can deploy both a slave node and a master node in the same JBoss AS instance. While you technically lose the CPU, memory, and input/output isolation, you still benefit from the ability to avoid receiving an OutOfMemoryException during heavy write periods provided that your JMS provider overflows messages on disk. Be careful not to deploy the MDB on the slave nodes.
We ll walk through the master node configuration. First we ll see how to build the
MDB, then we ll explain how to configure the backend, and finally we ll show how to
enable the right directory providers.
10.3.1 Building the message consumer
Slave nodes send their work list into a JMS message. The easiest way to consume these messages in a Java environment is to use a message-driven bean. While Hibernate Search doesn t provide the MDB code, it provides an abstract class your MDB can extend. Let s have a look at a typical MDB implementation in listing 10.3.
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