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<bindings> <binding>/HSearchJMSConnectionFactory</binding> <binding>/ConnectionFactory</binding> <binding>/XAConnectionFactory</binding> <binding>java:/ConnectionFactory</binding> <binding>java:/XAConnectionFactory</binding> </bindings> </attribute> </mbean>
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Once again, it s usually better to use the default values because it makes your configuration more readable to your users. The final step configures directory providers to share index changes with the slaves.
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10.3.3 Preparing the directory providers
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We have the right piece of software in place, but we do not yet propagate index directories to the slaves. Contrary to the behavior of slave nodes, the master will physically interact with Lucene indexes. You don t need to change the default backend configuration. However, the DirectoryProviders must copy indexes to a shared location on a regular basis. Listing 10.5 shows a configuration example.
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Listing 10.5
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DirectoryProviders must copy indexes to shared location
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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 --> <!-- no change in backend configuration -->
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<!-- DirectoryProvider configuration --> <property name="hibernate.search.default.directory_provider" value="org.hibernate.search. store.FSMasterDirectoryProvider"/> Copy from the <property name="hibernate.search.default.refresh" master every value="1800"/> 30 minutes <property name="hibernate.search.default.indexBase" value="/Users/prod/lucenedirs"/> <property name="hibernate.search.default.sourceBase" value="/mnt/share"/> Local directory where </properties> Directory where master indexes are written </persistence-unit> indexes are shared
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Master directory provider
The sourceBase for the master must be the same as the sourceBase for the slaves. It is the shared location where indexes are passed along. The shared location will contain two versions of each index at a given time: the active version slaves copy their value
Scalability: using Hibernate Search in a cluster
from and the passive version the master copies the value to. When the master is finished with its copy, it switches the active and passive versions. For more information on the directory provider configuration in a cluster, you read section 5.1.4. Also take time to run the code examples provided.
10.4 Summary
This chapter discussed clustering approaches and gave you the keys for understanding their pros and cons. It described in detail the standard method for clustering Hibernate Search asynchronously. Don t forget that this is only the recommended approach, and you can always use variations of this technique or even a totally different approach. The key is to make sure you limit the number of nodes waiting on the global pessimistic lock held at the index level. The standard approach has a few important features:
It keeps slaves working even when the master node goes down. It keeps searches fast. Indexes are copied locally, and queries trigger only local I/O. It prevents OutOfMemoryException errors even during heavy indexwriting loads. It keeps the master noncritical to the application s main operations and easily switchable to another machine.
We ve now shown you pretty much all that you need to know about Hibernate Search. The next part of the book will explore Lucene in a deeper way. While not directly influencing how you work daily with Hibernate Search, this knowledge is quite useful because Hibernate Search relies on Apache Lucene for the full-text search engine. You will soon gain a better understanding of how query results are produced.
Accessing Lucene natively
This chapter covers
Utilizing the SearchFactory Accessing Lucene directories Working with
DirectoryProviders
Exploiting projections
If you have not realized it by now, or you just started reading this chapter first, Lucene is the driving force behind the Hibernate Search framework. The entire book up to this point has been dedicated to helping you understand how to implement Hibernate Search in your application. Eventually, everyone has questions related to working with Lucene directly. We hear questions similar to the following all the time:
Hibernate Search s default constructs won t work for me. Now what do I do I know Hibernate Search takes care of a lot of things for me, but I need to get at Lucene itself and work with its native constructs. How can I do that
Accessing Lucene natively
Can I get an instance of a Lucene Directory object so I can work at a lower level Hibernate Search has sharded my entity into three separate directories. Is it possible to work with them as a single object Can I improve retrieval performance
Do any of these sound familiar We re going to answer these questions in this chapter. We ll start by looking at Hibernate Search s SearchFactory, which is the key entry point to Lucene. It allows access to Directory objects and IndexReaders. We ll look at the effects that sharding has on these classes, and along the way we ll also see what goes on when indexing multiple entities. One of the things that developers must assess is whether or not the default DirectoryProviders included with Hibernate Search are sufficient for their purposes. In the event they are not, you can write a custom one. We ll discuss what you must take into account in this situation. We ll also show you how to access the legacy Lucene document and several related values by utilizing a projection, and we ll demonstrate how it can affect performance. We believe you ll be pleasantly surprised, because accessing native Lucene is much easier than you think.
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