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From Yakob <>
Subject Re: flushing index
Date Tue, 28 Sep 2010 06:18:03 GMT
On 9/27/10, Uwe Schindler <> wrote:
> Yes. You must close before, else the addIndexes call will do nothing, as the
> index looks empty for the addIndexes() call (because no committed segments
> are available in the ramDir).
> I don't understand what you mean with flushing? If you are working on Lucene
> 2.9 or 3.0, the ramWriter is flushed to the RAMDir on close. The addIndexes
> call will add the index to the on-disk writer. To flush that fsWriter (flush
> is the wrong thing, you probably mean commit), simply call fsWriter.commit()
> so the newly added segments are written to disk and IndexReaders opened in
> parallel "see" the new segments.
> Btw: If you are working on Lucene 3.0, the addIndexes call does not need the
> new Directory[] {}, as the method is Java 5 varargs now.
> Uwe

I mean I need to flush the index periodically.that's mean that the
index will be regularly updated as the document being added.what do
you reckon is the solution for this? I need a sample source code to be
able to flush an index.

ok just like this source code below.

public class SimpleFileIndexer {
	public static void main(String[] args) throws Exception {
		File indexDir = new
		File dataDir = new
		String suffix = "txt";
		SimpleFileIndexer indexer = new SimpleFileIndexer();
		int numIndex = indexer.index(indexDir, dataDir, suffix);
		System.out.println("Total files indexed " + numIndex);
	private int index(File indexDir, File dataDir, String suffix) throws
Exception {
		IndexWriter indexWriter = new IndexWriter(,
				new SimpleAnalyzer(),
		indexDirectory(indexWriter, dataDir, suffix);
		int numIndexed = indexWriter.maxDoc();
		return numIndexed;
	private void indexDirectory(IndexWriter indexWriter, File dataDir,
String suffix) throws IOException {
		File[] files = dataDir.listFiles();
		for (int i = 0; i < files.length; i++) {
			File f = files[i];
			if (f.isDirectory()) {
				indexDirectory(indexWriter, f, suffix);
			else {
				indexFileWithIndexWriter(indexWriter, f, suffix);
	private void indexFileWithIndexWriter(IndexWriter indexWriter, File
f, String suffix) throws IOException {
		if (f.isHidden() || f.isDirectory() || !f.canRead() || !f.exists()) {
		if (suffix!=null && !f.getName().endsWith(suffix)) {
		System.out.println("Indexing file " + f.getCanonicalPath());
		Document doc = new Document();
		doc.add(new Field("contents", new FileReader(f)));		
		doc.add(new Field("filename", f.getCanonicalPath(), Field.Store.YES,


the above source code can index documents when given the directory of
text files. now what I am asking is how can I made the code to run
continuously? what class should I use? so that everytime there is new
documents added to that directory then lucene will index those
documents automatically, can you help me out on this one. I really
need to know what is the best solution.


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