Frequent updates lead to "Too many open files"

Hi,

I have a single IndexWriter object which I use to update
the index. After each update, I'd like to query the index
using IndexReader and IndexSearcher objects.

When I try to do that I get java.io.FileNotFoundException:
/tmp/lucene/_32.fdx (Too many open files).

lsof -p says that there are many open file handles to the
same index file name, all but the last with a (deleted) marker.

I think I close everything properly.

Here's the code for the test case which reproduces the issue:

Directory ldir = new SimpleFSDirectory(new File("/tmp/lucene"));

IndexWriter writer = new IndexWriter(ldir, new
StandardAnalyzer(Version.LUCENE_30), IndexWriter.MaxFieldLength.LIMITED);
IndexReader reader = IndexReader.open(ldir);

IndexSearcher searcher = new IndexSearcher(reader);

for (int i = 0; i < 1000; i++) {
Document doc = new Document();
doc.add(new Field("uri", "http://example.org/", Field.Store.YES, Field.Index.NO));
writer.addDocument(doc);
writer.commit();

reader.reopen();
searcher.close();
searcher = new IndexSearcher(reader);

// do something here

Term term = new Term("uri", "http://example.org/");
writer.deleteDocuments(term);
writer.commit();
}

Any idea what's going wrong?

Cheers,
Andreas.

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