Examples of FSDirectory

org.apache.hadoop.hdfs.server.namenode.FSDirectory

FSDirectory stores the filesystem directory state. It handles writing/loading values to disk, and logging changes as we go. It keeps the filename->blockset mapping always-current and logged to disk.

org.apache.lucene.store.FSDirectory

sun.com/bugdatabase/view_bug.do?bug_id=6265734">Sun JRE bug this is a poor choice for Windows, but on all other platforms this is the preferred choice. Applications using {@link Thread#interrupt()} or{@link Future#cancel(boolean)} should use{@link SimpleFSDirectory} instead. See {@link NIOFSDirectory} java docfor details.

{@link MMapDirectory} uses memory-mapped IO whenreading. This is a good choice if you have plenty of virtual memory relative to your index size, eg if you are running on a 64 bit JRE, or you are running on a 32 bit JRE but your index sizes are small enough to fit into the virtual memory space. Java has currently the limitation of not being able to unmap files from user code. The files are unmapped, when GC releases the byte buffers. Due to this bug in Sun's JRE, MMapDirectory's {@link IndexInput#close}is unable to close the underlying OS file handle. Only when GC finally collects the underlying objects, which could be quite some time later, will the file handle be closed. This will consume additional transient disk usage: on Windows, attempts to delete or overwrite the files will result in an exception; on other platforms, which typically have a "delete on last close" semantics, while such operations will succeed, the bytes are still consuming space on disk. For many applications this limitation is not a problem (e.g. if you have plenty of disk space, and you don't rely on overwriting files on Windows) but it's still an important limitation to be aware of. This class supplies a (possibly dangerous) workaround mentioned in the bug report, which may fail on non-Sun JVMs. Applications using {@link Thread#interrupt()} or{@link Future#cancel(boolean)} should use{@link SimpleFSDirectory} instead. See {@link MMapDirectory}java doc for details.

The locking implementation is by default {@link NativeFSLockFactory}, but can be changed by passing in a custom {@link LockFactory} instance. @see Directory

    public void testWriteFileThenRemountFSAndRead() throws Exception {
        setUp();


        final String fileName = "RWTest";


        FSDirectory rootDir = getFs().getRootEntry().getDirectory();
        FSFile file = null;
        ByteBuffer data = ByteBuffer.wrap(TestUtils.getTestData(FILE_SIZE_IN_WORDS));


        if (config.isReadOnly()) {
            try {
                file = rootDir.addFile(fileName).getFile();
                fail("addFile must throw ReadOnlyFileSystemException in readOnly mode");
            } catch (ReadOnlyFileSystemException rofse) {
                // success
            }
        } else {
            file = rootDir.addFile(fileName).getFile();
            file.write(0, data);
            file.flush();


            assertSize("bad file.length after write", data.capacity(), file.getLength());
        }


        remountFS(config, config.isReadOnly());


        if (!config.isReadOnly()) {
            FSDirectory rootDir2 = getFs().getRootEntry().getDirectory();
            FSFile file2 = rootDir2.getEntry(fileName).getFile();
            assertNotNull("file not saved", file2);
            assertSize("bad file.length after remount", data.capacity(), file2.getLength());


            ByteBuffer data2 = ByteBuffer.allocate(data.capacity());
            log.debug(

Examples of org.jnode.fs.FSDirectory

            final String fileName = "RWTest";


            ByteBuffer data = ByteBuffer.wrap(addTestFile(fileName, FILE_SIZE_IN_WORDS));


            // re-get the entry to our test file
            FSDirectory rootDir2 = getFs().getRootEntry().getDirectory();
            FSFile file2 = rootDir2.getEntry(fileName).getFile();


            // In readOnly mode, writing to our file must fail
            try {
                file2.write(0, data);
                fail("write must throw ReadOnlyFileSystemException in readOnly mode");

Examples of org.jnode.fs.FSDirectory

        fs.create(params);
        fs.close();
        fs = new HfsPlusFileSystemType().create(device, false);
        fs.read();
        fs.createRootEntry();
        FSDirectory root = fs.getRootEntry().getDirectory();
        Assert.assertFalse("Must be empty", root.iterator().hasNext());
        root.addDirectory("test");
        fs.flush();
        fs.close();
        fs = new HfsPlusFileSystemType().create(device, false);
        fs.read();
        Assert.assertEquals(1, fs.getVolumeHeader().getFolderCount());
        fs.createRootEntry();
        root = fs.getRootEntry().getDirectory();
        Assert.assertTrue("Must contains one directory", root.iterator().hasNext());
    }