Package org.apache.lucene.store
Class DirectIOLinuxDirectory
- java.lang.Object
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- org.apache.lucene.store.Directory
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- org.apache.lucene.store.FSDirectory
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- org.apache.lucene.store.DirectIOLinuxDirectory
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- All Implemented Interfaces:
Closeable
,AutoCloseable
public class DirectIOLinuxDirectory extends FSDirectory
AnDirectory
implementation that uses the Linux-specific O_DIRECT flag to bypass all OS level caching. To use this you must compile NativePosixUtil.cpp (exposes Linux-specific APIs through JNI) for your platform.WARNING: this code is very new and quite easily could contain horrible bugs. For example, here's one known issue: if you use seek in IndexOutput, and then write more than one buffer's worth of bytes, then the file will be wrong. Lucene does not do this (only writes small number of bytes after seek).
- WARNING: This API is experimental and might change in incompatible ways in the next release.
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Nested Class Summary
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Nested classes/interfaces inherited from class org.apache.lucene.store.FSDirectory
FSDirectory.FSIndexOutput
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Field Summary
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Fields inherited from class org.apache.lucene.store.FSDirectory
DEFAULT_READ_CHUNK_SIZE, directory, staleFiles
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Fields inherited from class org.apache.lucene.store.Directory
isOpen, lockFactory
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Constructor Summary
Constructors Constructor Description DirectIOLinuxDirectory(File path, LockFactory lockFactory, int forcedBufferSize)
Create a new NIOFSDirectory for the named location.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description IndexOutput
createOutput(String name)
Creates an IndexOutput for the file with the given name.IndexInput
openInput(String name, int bufferSize)
Returns a stream reading an existing file, with the specified read buffer size.-
Methods inherited from class org.apache.lucene.store.FSDirectory
close, deleteFile, ensureCanWrite, fileExists, fileLength, fileModified, fileModified, fsync, getDirectory, getFile, getLockID, getReadChunkSize, listAll, listAll, onIndexOutputClosed, open, open, openInput, setLockFactory, setReadChunkSize, sync, sync, toString, touchFile
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Methods inherited from class org.apache.lucene.store.Directory
clearLock, copy, copy, ensureOpen, getLockFactory, makeLock
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Constructor Detail
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DirectIOLinuxDirectory
public DirectIOLinuxDirectory(File path, LockFactory lockFactory, int forcedBufferSize) throws IOException
Create a new NIOFSDirectory for the named location.- Parameters:
path
- the path of the directorylockFactory
- the lock factory to use, or null for the default (NativeFSLockFactory
);forcedBufferSize
- if this is 0, just use Lucene's default buffer size; else, force this buffer size. For best performance, force the buffer size to something fairly large (eg 1 MB), but note that this will eat up the JRE's direct buffer storage space- Throws:
IOException
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Method Detail
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openInput
public IndexInput openInput(String name, int bufferSize) throws IOException
Description copied from class:Directory
Returns a stream reading an existing file, with the specified read buffer size. The particular Directory implementation may ignore the buffer size. Currently the only Directory implementations that respect this parameter areFSDirectory
andCompoundFileReader
.- Overrides:
openInput
in classDirectory
- Throws:
IOException
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createOutput
public IndexOutput createOutput(String name) throws IOException
Description copied from class:FSDirectory
Creates an IndexOutput for the file with the given name.- Overrides:
createOutput
in classFSDirectory
- Throws:
IOException
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