Lucene example source code file (TestTieredMergePolicy.java)

This example Lucene source code file (TestTieredMergePolicy.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Lucene tags/keywords

directory, document, document, exception, indexwriter, indexwriter, indexwriterconfig, mockanalyzer, mockanalyzer, term, testtieredmergepolicy, tieredmergepolicy, verbose, verbose

The Lucene TestTieredMergePolicy.java source code

package org.apache.lucene.index;

/**
 * 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.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util._TestUtil;

public class TestTieredMergePolicy extends LuceneTestCase {

  public void testExpungeDeletes() throws Exception {
    Directory dir = newDirectory();
    IndexWriterConfig conf = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random));
    TieredMergePolicy tmp = newTieredMergePolicy();
    conf.setMergePolicy(tmp);
    conf.setMaxBufferedDocs(4);
    tmp.setMaxMergeAtOnce(100);
    tmp.setSegmentsPerTier(100);
    tmp.setExpungeDeletesPctAllowed(30.0);
    IndexWriter w = new IndexWriter(dir, conf);
    w.setInfoStream(VERBOSE ? System.out : null);
    for(int i=0;i<80;i++) {
      Document doc = new Document();
      doc.add(newField("content", "aaa " + (i%4), Field.Store.NO, Field.Index.ANALYZED));
      w.addDocument(doc);
    }
    assertEquals(80, w.maxDoc());
    assertEquals(80, w.numDocs());

    if (VERBOSE) {
      System.out.println("\nTEST: delete docs");
    }
    w.deleteDocuments(new Term("content", "0"));
    w.expungeDeletes();

    assertEquals(80, w.maxDoc());
    assertEquals(60, w.numDocs());

    if (VERBOSE) {
      System.out.println("\nTEST: expunge2");
    }
    tmp.setExpungeDeletesPctAllowed(10.0);
    w.expungeDeletes();
    assertEquals(60, w.maxDoc());
    assertEquals(60, w.numDocs());
    w.close();
    dir.close();
  }

  public void testPartialOptimize() throws Exception {
    int num = atLeast(10);
    for(int iter=0;iter<num;iter++) {
      if (VERBOSE) {
        System.out.println("TEST: iter=" + iter);
      }
      Directory dir = newDirectory();
      IndexWriterConfig conf = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random));
      conf.setMergeScheduler(new SerialMergeScheduler());
      TieredMergePolicy tmp = newTieredMergePolicy();
      conf.setMergePolicy(tmp);
      conf.setMaxBufferedDocs(2);
      tmp.setMaxMergeAtOnce(3);
      tmp.setSegmentsPerTier(6);

      IndexWriter w = new IndexWriter(dir, conf);
      w.setInfoStream(VERBOSE ? System.out : null);
      int maxCount = 0;
      final int numDocs = _TestUtil.nextInt(random, 20, 100);
      for(int i=0;i<numDocs;i++) {
        Document doc = new Document();
        doc.add(newField("content", "aaa " + (i%4), Field.Store.NO, Field.Index.ANALYZED));
        w.addDocument(doc);
        int count = w.getSegmentCount();
        maxCount = Math.max(count, maxCount);
        assertTrue("count=" + count + " maxCount=" + maxCount, count >= maxCount-3);
      }

      w.flush(true, true);

      int segmentCount = w.getSegmentCount();
      int targetCount = _TestUtil.nextInt(random, 1, segmentCount);
      if (VERBOSE) {
        System.out.println("TEST: optimize to " + targetCount + " segs (current count=" + segmentCount + ")");
      }
      w.optimize(targetCount);
      assertEquals(targetCount, w.getSegmentCount());

      w.close();
      dir.close();
    }
  }
}