Class NativeFSLockFactory

Implements LockFactory using native OS file locks. For NFS based access to an index, it's recommended that you try SimpleFSLockFactory first and work around the one limitation that a lock file could be left when the runtime exits abnormally.

The primary benefit of NativeFSLockFactory is that locks (not the lock file itsself) will be properly removed (by the OS) if the runtime has an abnormal exit.

Note that, unlike SimpleFSLockFactory, the existence of leftover lock files in the filesystem is fine because the OS will free the locks held against these files even though the files still remain. Lucene will never actively remove the lock files, so although you see them, the index may not be locked.

Special care needs to be taken if you change the locking implementation: First be certain that no writer is in fact writing to the index otherwise you can easily corrupt your index. Be sure to do the LockFactory change on all Lucene instances and clean up all leftover lock files before starting the new configuration for the first time. Different implementations can not work together!

If you suspect that this or any other LockFactory is not working properly in your environment, you can easily test it by using VerifyingLockFactory, LockVerifyServer and LockStressTest.

Inheritance
System.Object
LockFactory
FSLockFactory
NativeFSLockFactory
Inherited Members
Namespace: Lucene.Net.Store
Assembly: Lucene.Net.dll
Syntax
public class NativeFSLockFactory : FSLockFactory

Constructors

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NativeFSLockFactory()

Create a NativeFSLockFactory instance, with null (unset) lock directory. When you pass this factory to a FSDirectory subclass, the lock directory is automatically set to the directory itself. Be sure to create one instance for each directory your create!

Declaration
public NativeFSLockFactory()
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NativeFSLockFactory(DirectoryInfo)

Create a NativeFSLockFactory instance, storing lock files into the specified lockDir

Declaration
public NativeFSLockFactory(DirectoryInfo lockDir)
Parameters
Type Name Description
DirectoryInfo lockDir

where lock files are created.

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NativeFSLockFactory(String)

Create a NativeFSLockFactory instance, storing lock files into the specified lockDirName

Declaration
public NativeFSLockFactory(string lockDirName)
Parameters
Type Name Description
System.String lockDirName

where lock files are created.

Methods

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ClearLock(String)

Declaration
public override void ClearLock(string lockName)
Parameters
Type Name Description
System.String lockName
Overrides
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MakeLock(String)

Declaration
public override Lock MakeLock(string lockName)
Parameters
Type Name Description
System.String lockName
Returns
Type Description
Lock
Overrides

See Also