3.9. LockFactory configuration
Lucene Directories have default locking strategies which work well for most cases, but it's possible to specify for each index managed by Hibernate Search which LockingFactory you want to use.
Some of these locking strategies require a file system level lock and may be used even on RAM based indexes, but this is not recommended and of no practical use.
To select a locking factory, set the
hibernate.search.<index>.locking_strategy option to one of simple, native, single or none, or set it to the fully qualified name of an implementation of org.hibernate.search.store.LockFactoryFactory; Implementing this interface you can provide a custom org.apache.lucene.store.LockFactory.
Table 3.4. List of available LockFactory implementations
| name | Class | Description |
|---|---|---|
| simple | org.apache.lucene.store.SimpleFSLockFactory |
Safe implementation based on Java's File API, it marks the usage of the index by creating a marker file.
If for some reason you had to kill your application, you will need to remove this file before restarting it.
This is the default implementation for
FSDirectoryProvider,FSMasterDirectoryProvider and FSSlaveDirectoryProvider.
|
| native | org.apache.lucene.store.NativeFSLockFactory |
As does
simple this also marks the usage of the index by creating a marker file, but this one is using native OS file locks so that even if your application crashes the locks will be cleaned up.
This implementation has known problems on NFS.
|
| single | org.apache.lucene.store.SingleInstanceLockFactory |
This LockFactory does not use a file marker but is a Java object lock held in memory; therefore it is possible to use it only when you are sure the index is not going to be shared by any other process.
This is the default implementation for
RAMDirectoryProvider.
|
| none | org.apache.lucene.store.NoLockFactory |
All changes to this index are not coordinated by any lock; test your application carefully and make sure you know what it means.
|
Configuration example:
hibernate.search.default.locking_strategy simple hibernate.search.Animals.locking_strategy native hibernate.search.Books.locking_strategy org.custom.components.MyLockingFactory
