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Table 5.1 Configuration of the master node directory provider Description
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Property name
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directory_provider
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org.hibernate.search.store.FSMasterDirectoryProvider
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Directory provider implementation. While you can use a different implementation in unconventional scenarios, FSMasterDirectoryProvider is the recommended provider.
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indexBase indexName sourceBase source refresh
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Root directory of the index directory working copy. Directory name of the working copy index. Defaults to the index name. This value is used in conjunction with indexBase. Root directory of the index directory source. Typically a shared filesystem. Directory name of the source index. Defaults to the index name. This value is used in conjunction with sourceBase. The working copy index is copied to the source every refresh seconds. The default value is one hour (3600 seconds).
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DirectoryProvider: storing the index
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The slave nodes copy the index stored in the source directory into their working copy on a regular basis. The source directory is the shared content between master and slaves. This directory is generally placed in a shared filesystem. Table 5.2 lists the properties available for slave directory providers.
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Table 5.2 Configuration of the slave node directory provider Description
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Property name
directory_provider
org.hibernate.search.store.FSSlaveDirectoryProvider
Directory provider implementation. While you can use a different implementation in unconventional scenarios, FSSlaveDirectoryProvider is the recommended provider.
indexBase indexName sourceBase source refresh
Root directory of the index directory working copy. Directory name of the working copy index. Defaults to the index name. This value is used in conjunction with indexBase. Root directory of the index directory source. Typically a shared filesystem. Directory name of the source index. Defaults to the index name. This value is used in conjunction with sourceBase. The source index directory is copied to the working directory every refresh seconds. The default value is one hour (3600 seconds).
Usually you ll simply need to configure directory_provider, indexBase, and sourceBase (as shown in listing 5.5) and let the default values finish the work for you.
Listing 5.5 Configure indexBase and sourceBase for all indexes
# Master configuration hibernate.search.default.directory_provider org.hibernate.search.store.FSMasterDirectoryProvider # refresh every half hour hibernate.search.default.refresh 1800 # master working directory location hibernate.search.default.indexBase /Users/prod/lucenedirs # source directory location where the master is copied to hibernate.search.default.sourceBase /mnt/sourcevolume/lucenedirs # Slave configuration hibernate.search.default.directory_provider org.hibernate.search.store.FSSlaveDirectoryProvider # refresh every half hour hibernate.search.default.refresh 1800 # slave working directory location hibernate.search.default.indexBase /Users/prod/lucenedirs
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# source directory location where the master is copied to hibernate.search.default.sourceBase /mnt/sourcevolume/lucenedirs
In this example, both master and slave share the index content in /mnt/sourcevolume/lucenedirs. sourceBase is identical in both configurations and points to the same physical storage. The refresh period is also identical. While it s not necessary to make these settings the same, it s usually a good practice unless you have specific reasons not to.
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The copy operations are slightly more complex than depicted previously. It would be dangerous to copy the value of one index directory into another one while the index is in use. The source directory contains two versions of the index: the active version, from which slaves copy the information, and the passive version, into which the master copies the new version. Hibernate Search copies the master to the shared source when no operations are at stake. A future version of Hibernate Search will probably use the Lucene snapshot feature to copy indexes while indexing operations are still running. Slaves copy the index from the active source. Copies are done asynchronously from the main operations. When the copy is finished, the newly copied directory becomes the active directory. Don t worry; everything is taken care of for you by Hibernate Search. An index can be quite big. Copying the entire index all the time would be quite inefficient. Hibernate Search tries to do a better job and copies only the incremental changes. You can think of it as a poor version of rsync. A file is copied only if it has changed since the last copy. The first time you copy the index or when a huge Lucene optimization has been executed, the copy will be total and slower. The subsequent copies will be lighter and thus faster.
We know you may need to implement custom directory providers to accommodate particular situations. Hibernate Search is flexible and lets you use your own implementation and logic.
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