home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Lucene example source code file (TestConcurrentMergeScheduler.java)

This example Lucene source code file (TestConcurrentMergeScheduler.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

document, document, failonlyonflush, indexreader, indexwriter, indexwriter, io, ioexception, ioexception, mockanalyzer, mockdirectorywrapper, override, test_version_current, verbose, verbose

The Lucene TestConcurrentMergeScheduler.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.store.MockDirectoryWrapper;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;

import org.apache.lucene.util.LuceneTestCase;
import java.io.IOException;

public class TestConcurrentMergeScheduler extends LuceneTestCase {
  
  private static class FailOnlyOnFlush extends MockDirectoryWrapper.Failure {
    boolean doFail;
    boolean hitExc;

    @Override
    public void setDoFail() {
      this.doFail = true;
      hitExc = false;
    }
    @Override
    public void clearDoFail() {
      this.doFail = false;
    }

    @Override
    public void eval(MockDirectoryWrapper dir)  throws IOException {
      if (doFail && (Thread.currentThread().getName().equals("main") 
          || Thread.currentThread().getName().equals("Main Thread"))) {
        boolean isDoFlush = false;
        boolean isClose = false;
        StackTraceElement[] trace = new Exception().getStackTrace();
        for (int i = 0; i < trace.length; i++) {
          if ("doFlush".equals(trace[i].getMethodName())) {
            isDoFlush = true;
          }
          if ("close".equals(trace[i].getMethodName())) {
            isClose = true;
          }
        }
        if (isDoFlush && !isClose && random.nextBoolean()) {
          hitExc = true;
          throw new IOException(Thread.currentThread().getName() + ": now failing during flush");
        }
      }
    }
  }

  // Make sure running BG merges still work fine even when
  // we are hitting exceptions during flushing.
  public void testFlushExceptions() throws IOException {
    MockDirectoryWrapper directory = newDirectory();
    FailOnlyOnFlush failure = new FailOnlyOnFlush();
    directory.failOn(failure);

    IndexWriter writer = new IndexWriter(directory, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).setMaxBufferedDocs(2));
    writer.setInfoStream(VERBOSE ? System.out : null);
    Document doc = new Document();
    Field idField = newField("id", "", Field.Store.YES, Field.Index.NOT_ANALYZED);
    doc.add(idField);
    int extraCount = 0;

    for(int i=0;i<10;i++) {
      if (VERBOSE) {
        System.out.println("TEST: iter=" + i);
      }

      for(int j=0;j<20;j++) {
        idField.setValue(Integer.toString(i*20+j));
        writer.addDocument(doc);
      }

      // must cycle here because sometimes the merge flushes
      // the doc we just added and so there's nothing to
      // flush, and we don't hit the exception
      while(true) {
        writer.addDocument(doc);
        failure.setDoFail();
        try {
          writer.flush(true, true);
          if (failure.hitExc) {
            fail("failed to hit IOException");
          }
          extraCount++;
        } catch (IOException ioe) {
          if (VERBOSE) {
            ioe.printStackTrace(System.out);
          }
          failure.clearDoFail();
          break;
        }
      }
      assertEquals(20*(i+1)+extraCount, writer.numDocs());
    }

    writer.close();
    IndexReader reader = IndexReader.open(directory, true);
    assertEquals(200+extraCount, reader.numDocs());
    reader.close();
    directory.close();
  }

  // Test that deletes committed after a merge started and
  // before it finishes, are correctly merged back:
  public void testDeleteMerging() throws IOException {
    MockDirectoryWrapper directory = newDirectory();

    LogDocMergePolicy mp = new LogDocMergePolicy();
    // Force degenerate merging so we can get a mix of
    // merging of segments with and without deletes at the
    // start:
    mp.setMinMergeDocs(1000);
    IndexWriter writer = new IndexWriter(directory, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random))
        .setMergePolicy(mp));
    writer.setInfoStream(VERBOSE ? System.out : null);

    Document doc = new Document();
    Field idField = newField("id", "", Field.Store.YES, Field.Index.NOT_ANALYZED);
    doc.add(idField);
    for(int i=0;i<10;i++) {
      if (VERBOSE) {
        System.out.println("\nTEST: cycle");
      }
      for(int j=0;j<100;j++) {
        idField.setValue(Integer.toString(i*100+j));
        writer.addDocument(doc);
      }

      int delID = i;
      while(delID < 100*(1+i)) {
        if (VERBOSE) {
          System.out.println("TEST: del " + delID);
        }
        writer.deleteDocuments(new Term("id", ""+delID));
        delID += 10;
      }

      writer.commit();
    }

    writer.close();
    IndexReader reader = IndexReader.open(directory, true);
    // Verify that we did not lose any deletes...
    assertEquals(450, reader.numDocs());
    reader.close();
    directory.close();
  }

  public void testNoExtraFiles() throws IOException {
    MockDirectoryWrapper directory = newDirectory();
    IndexWriter writer = new IndexWriter(directory, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random))
        .setMaxBufferedDocs(2));
    writer.setInfoStream(VERBOSE ? System.out : null);

    for(int iter=0;iter<7;iter++) {
      if (VERBOSE) {
        System.out.println("TEST: iter=" + iter);
      }

      for(int j=0;j<21;j++) {
        Document doc = new Document();
        doc.add(newField("content", "a b c", Field.Store.NO, Field.Index.ANALYZED));
        writer.addDocument(doc);
      }
        
      writer.close();
      TestIndexWriter.assertNoUnreferencedFiles(directory, "testNoExtraFiles");

      // Reopen
      writer = new IndexWriter(directory, newIndexWriterConfig(
          TEST_VERSION_CURRENT, new MockAnalyzer(random))
          .setOpenMode(OpenMode.APPEND).setMaxBufferedDocs(2));
      writer.setInfoStream(VERBOSE ? System.out : null);
    }

    writer.close();

    directory.close();
  }

  public void testNoWaitClose() throws IOException {
    MockDirectoryWrapper directory = newDirectory();
    Document doc = new Document();
    Field idField = newField("id", "", Field.Store.YES, Field.Index.NOT_ANALYZED);
    doc.add(idField);

    IndexWriter writer = new IndexWriter(
        directory,
        newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).
            setMaxBufferedDocs(2).
            setMergePolicy(newLogMergePolicy(100))
    );

    for(int iter=0;iter<10;iter++) {

      for(int j=0;j<201;j++) {
        idField.setValue(Integer.toString(iter*201+j));
        writer.addDocument(doc);
      }

      int delID = iter*201;
      for(int j=0;j<20;j++) {
        writer.deleteDocuments(new Term("id", Integer.toString(delID)));
        delID += 5;
      }

      // Force a bunch of merge threads to kick off so we
      // stress out aborting them on close:
      ((LogMergePolicy) writer.getConfig().getMergePolicy()).setMergeFactor(3);
      writer.addDocument(doc);
      writer.commit();

      writer.close(false);

      IndexReader reader = IndexReader.open(directory, true);
      assertEquals((1+iter)*182, reader.numDocs());
      reader.close();

      // Reopen
      writer = new IndexWriter(
          directory,
          newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).
              setOpenMode(OpenMode.APPEND).
              setMergePolicy(newLogMergePolicy(100))
      );
    }
    writer.close();

    directory.close();
  }
}

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene TestConcurrentMergeScheduler.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2019 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.