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From Chris Hostetter <hossman_luc...@fucit.org>
Subject Re: Lucene 2.9.0-rc5 : Reader stays open after IndexWriter.updateDocument(), is that possible?
Date Sun, 27 Sep 2009 01:33:58 GMT

: Thanks Mark for the pointer, I thought somehow that lucene closed them as a
: convenience, I don't know if it did that in previous releases (aka 2.4.1) but
: I'll close them myself from now on.

FWIW: As far as i know, Lucene has always closed the Reader for you when 
calling addDocument/updateDocument -- BUT -- the docs never promized 
that Lucene would close any Readers used in Fields.  In fact the Field 
constructor docs say "you may not close the Reader until addDocument has 
been called" suggesting that you should close it yourself.  
(Reader.close() is very clear that there should be no effect on closing a 
Reader multiple times, so this is safe no matter what Lucene does)

That said: If the behavior has changed in 2.9, this could easily bite lots 
of people in the ass if they haven't been closing their readers and now 
they run out of file handles.  I wrote a quick test to try and reproduce 
the problem you're describing, but as far as i can tell 2.9.0 
(final) still seems to close the Reader for you.

Can anyone else reproduce this problem of Reader's in Field's not getting 
closed?  (my test is below)

--BEGIN--
package org.apache.lucene;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.apache.lucene.analysis.KeywordAnalyzer;
import org.apache.lucene.index.*;
import org.apache.lucene.document.*;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.store.RAMDirectory;

import java.io.*;

public class TestFieldWithReaderClosing extends LuceneTestCase {

  IndexWriter writer = null;
  Document d = null;
  CloseStateReader reader;
  public void setUp() throws Exception {
    writer = new IndexWriter(new RAMDirectory(),
                             new KeywordAnalyzer(), true,
                             IndexWriter.MaxFieldLength.LIMITED);
    d = new Document();
    d.add(new Field("id", "x", Field.Store.YES, Field.Index.ANALYZED));
    reader = new CloseStateReader("foo");
    d.add(new Field("contents", reader));
  }
  public void tearDown() throws Exception {
    writer.close();
    writer = null;
    reader.close();
    reader = null;
  }
  
  public void testAdd() throws Exception {
    writer.addDocument(d);
    assertEquals("close count should be 1", 1, reader.getCloseCount());
    writer.close();
    assertEquals("close count should still be 1", 1, reader.getCloseCount());
  }
  public void testEmptyUpdate() throws Exception {
    writer.updateDocument(new Term("id","x"), d);
    assertEquals("close count should be 1", 1, reader.getCloseCount());
    writer.close();
    assertEquals("close count should still be 1", 1, reader.getCloseCount());
  }
  public void testAddAndUpdate() throws Exception {
    writer.addDocument(d);
    assertEquals("close count should be 1", 1, reader.getCloseCount());
    d = new Document();
    d.add(new Field("id", "x", Field.Store.YES, Field.Index.ANALYZED));
    reader = new CloseStateReader("foo");
    d.add(new Field("contents", reader));
    writer.updateDocument(new Term("id","x"), d);
    assertEquals("new close count should be 1", 1, reader.getCloseCount());
    writer.close();
    assertEquals("new close count should still be 1", 1, reader.getCloseCount());
  }

  
  static class CloseStateReader extends StringReader {
    private int closeCount = 0;
    public CloseStateReader(String s) {
      super(s);
    }
    public synchronized void close() {
      closeCount++;
      super.close();
    }
    public int getCloseCount() {
      return closeCount;
    }
  }
}


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