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3.3.2. The Infinispan Directory

In addition to the Lucene directory implementations, Red Hat JBoss Data Grid also ships with an infinispan-directory module.

Note

Red Hat JBoss Data Grid only supports infinispan-directory in the context of the Querying feature, not as a standalone feature.
The infinispan-directory allows Lucene to store indexes within the distributed data grid. This allows the indexes to be distributed, stored in-memory, and optionally written to disk using the cache store for durability.
This can be configured by having the named cache store indexes in JBoss Data Grid. For example: 
<namedCache name="indexesInInfinispan">
	<indexing enabled="true">
		<properties>
			<property name="default.directory_provider" 
				  value="infinispan" />
			<property name="default.exclusive_index_use" 
				  value="false" />
		</properties>
	</indexing>
</namedCache>
Sharing the same index instance using the Infinispan Directory Provider, introduces a write contention point, as only one instance can write on the same index at the same time. The property exclusive_index_use must be set to "false" and in most cases an alternative back end must be setup.
The default back end can be used if there is very low contention on writes or if the application can guarantee all writes on the index are originated on the same node.
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