org.apache.lucene.store
Class DirectIOLinuxDirectory
java.lang.Object
org.apache.lucene.store.Directory
org.apache.lucene.store.FSDirectory
org.apache.lucene.store.DirectIOLinuxDirectory
- All Implemented Interfaces:
- Closeable
public class DirectIOLinuxDirectory
- extends FSDirectory
An Directory
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.
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 |
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
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 are
FSDirectory
and CompoundFileReader
.
- Overrides:
openInput
in class Directory
- Throws:
IOException
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 class FSDirectory
- Throws:
IOException
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