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Lucene example source code file (TestIndexWriterWithThreads.java)

This example Lucene source code file (TestIndexWriterWithThreads.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

concurrentmergescheduler, document, exception, exception, failonlyinwritesegment, failonlyonabortorflush, indexerthread, indexerthread, indexwriter, indexwriter, io, ioexception, ioexception, num_threads, throwable

The Lucene TestIndexWriterWithThreads.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 java.io.IOException;

import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.store.AlreadyClosedException;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.MockDirectoryWrapper;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util.ThreadInterruptedException;

/**
 * MultiThreaded IndexWriter tests
 */
public class TestIndexWriterWithThreads extends LuceneTestCase {

  // Used by test cases below
  private class IndexerThread extends Thread {

    boolean diskFull;
    Throwable error;
    AlreadyClosedException ace;
    IndexWriter writer;
    boolean noErrors;
    volatile int addCount;

    public IndexerThread(IndexWriter writer, boolean noErrors) {
      this.writer = writer;
      this.noErrors = noErrors;
    }

    @Override
    public void run() {

      final Document doc = new Document();
      doc.add(newField("field", "aaa bbb ccc ddd eee fff ggg hhh iii jjj", Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));

      int idUpto = 0;
      int fullCount = 0;
      final long stopTime = System.currentTimeMillis() + 200;

      do {
        try {
          writer.updateDocument(new Term("id", ""+(idUpto++)), doc);
          addCount++;
        } catch (IOException ioe) {
          //System.out.println(Thread.currentThread().getName() + ": hit exc");
          //ioe.printStackTrace(System.out);
          if (ioe.getMessage().startsWith("fake disk full at") ||
              ioe.getMessage().equals("now failing on purpose")) {
            diskFull = true;
            try {
              Thread.sleep(1);
            } catch (InterruptedException ie) {
              throw new ThreadInterruptedException(ie);
            }
            if (fullCount++ >= 5)
              break;
          } else {
            if (noErrors) {
              System.out.println(Thread.currentThread().getName() + ": ERROR: unexpected IOException:");
              ioe.printStackTrace(System.out);
              error = ioe;
            }
            break;
          }
        } catch (Throwable t) {
          //t.printStackTrace(System.out);
          if (noErrors) {
            System.out.println(Thread.currentThread().getName() + ": ERROR: unexpected Throwable:");
            t.printStackTrace(System.out);
            error = t;
          }
          break;
        }
      } while(System.currentTimeMillis() < stopTime);
    }
  }

  // LUCENE-1130: make sure immediate disk full on creating
  // an IndexWriter (hit during DW.ThreadState.init()), with
  // multiple threads, is OK:
  public void testImmediateDiskFullWithThreads() throws Exception {

    int NUM_THREADS = 3;

    for(int iter=0;iter<10;iter++) {
      if (VERBOSE) {
        System.out.println("\nTEST: iter=" + iter);
      }
      MockDirectoryWrapper dir = newDirectory();
      IndexWriter writer = new IndexWriter(
          dir,
          newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).
              setMaxBufferedDocs(2).
              setMergeScheduler(new ConcurrentMergeScheduler()).
              setMergePolicy(newLogMergePolicy(4))
      );
      ((ConcurrentMergeScheduler) writer.getConfig().getMergeScheduler()).setSuppressExceptions();
      dir.setMaxSizeInBytes(4*1024+20*iter);
      writer.setInfoStream(VERBOSE ? System.out : null);

      IndexerThread[] threads = new IndexerThread[NUM_THREADS];

      for(int i=0;i<NUM_THREADS;i++)
        threads[i] = new IndexerThread(writer, true);

      for(int i=0;i<NUM_THREADS;i++)
        threads[i].start();

      for(int i=0;i<NUM_THREADS;i++) {
        // Without fix for LUCENE-1130: one of the
        // threads will hang
        threads[i].join();
        assertTrue("hit unexpected Throwable", threads[i].error == null);
      }

      // Make sure once disk space is avail again, we can
      // cleanly close:
      dir.setMaxSizeInBytes(0);
      writer.close(false);
      dir.close();
    }
  }
  

  // LUCENE-1130: make sure we can close() even while
  // threads are trying to add documents.  Strictly
  // speaking, this isn't valid us of Lucene's APIs, but we
  // still want to be robust to this case:
  public void testCloseWithThreads() throws Exception {
    int NUM_THREADS = 3;

    for(int iter=0;iter<7;iter++) {
      Directory dir = newDirectory();
      IndexWriterConfig conf = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random))
        .setMaxBufferedDocs(10).setMergeScheduler(new ConcurrentMergeScheduler()).setMergePolicy(newLogMergePolicy(4));
      // We expect AlreadyClosedException
      ((ConcurrentMergeScheduler) conf.getMergeScheduler()).setSuppressExceptions();
      IndexWriter writer = new IndexWriter(dir, conf);

      IndexerThread[] threads = new IndexerThread[NUM_THREADS];

      for(int i=0;i<NUM_THREADS;i++)
        threads[i] = new IndexerThread(writer, false);

      for(int i=0;i<NUM_THREADS;i++)
        threads[i].start();

      boolean done = false;
      while(!done) {
        Thread.sleep(100);
        for(int i=0;i<NUM_THREADS;i++)
          // only stop when at least one thread has added a doc
          if (threads[i].addCount > 0) {
            done = true;
            break;
          }
      }

      writer.close(false);

      // Make sure threads that are adding docs are not hung:
      for(int i=0;i<NUM_THREADS;i++) {
        // Without fix for LUCENE-1130: one of the
        // threads will hang
        threads[i].join();
        if (threads[i].isAlive())
          fail("thread seems to be hung");
      }

      // Quick test to make sure index is not corrupt:
      IndexReader reader = IndexReader.open(dir, true);
      TermDocs tdocs = reader.termDocs(new Term("field", "aaa"));
      int count = 0;
      while(tdocs.next()) {
        count++;
      }
      assertTrue(count > 0);
      reader.close();
      
      dir.close();
    }
  }

  // Runs test, with multiple threads, using the specific
  // failure to trigger an IOException
  public void _testMultipleThreadsFailure(MockDirectoryWrapper.Failure failure) throws Exception {

    int NUM_THREADS = 3;

    for(int iter=0;iter<2;iter++) {
      MockDirectoryWrapper dir = newDirectory();
      IndexWriterConfig conf = newIndexWriterConfig( TEST_VERSION_CURRENT,
                                                     new MockAnalyzer(random)).setMaxBufferedDocs(2).setMergeScheduler(new ConcurrentMergeScheduler()).setMergePolicy(newLogMergePolicy(4));
      // We expect disk full exceptions in the merge threads
      ((ConcurrentMergeScheduler) conf.getMergeScheduler()).setSuppressExceptions();
      IndexWriter writer = new IndexWriter(dir, conf);

      IndexerThread[] threads = new IndexerThread[NUM_THREADS];

      for(int i=0;i<NUM_THREADS;i++)
        threads[i] = new IndexerThread(writer, true);

      for(int i=0;i<NUM_THREADS;i++)
        threads[i].start();

      Thread.sleep(10);

      dir.failOn(failure);
      failure.setDoFail();

      for(int i=0;i<NUM_THREADS;i++) {
        threads[i].join();
        assertTrue("hit unexpected Throwable", threads[i].error == null);
      }

      boolean success = false;
      try {
        writer.close(false);
        success = true;
      } catch (IOException ioe) {
        failure.clearDoFail();
        writer.close(false);
      }

      if (success) {
        IndexReader reader = IndexReader.open(dir, true);
        for(int j=0;j<reader.maxDoc();j++) {
          if (!reader.isDeleted(j)) {
            reader.document(j);
            reader.getTermFreqVectors(j);
          }
        }
        reader.close();
      }

      dir.close();
    }
  }

  // Runs test, with one thread, using the specific failure
  // to trigger an IOException
  public void _testSingleThreadFailure(MockDirectoryWrapper.Failure failure) throws IOException {
    MockDirectoryWrapper dir = newDirectory();

    IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random))
      .setMaxBufferedDocs(2).setMergeScheduler(new ConcurrentMergeScheduler()));
    final Document doc = new Document();
    doc.add(newField("field", "aaa bbb ccc ddd eee fff ggg hhh iii jjj", Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));

    for(int i=0;i<6;i++)
      writer.addDocument(doc);

    dir.failOn(failure);
    failure.setDoFail();
    try {
      writer.addDocument(doc);
      writer.addDocument(doc);
      writer.commit();
      fail("did not hit exception");
    } catch (IOException ioe) {
    }
    failure.clearDoFail();
    writer.addDocument(doc);
    writer.close(false);
    dir.close();
  }

  // Throws IOException during FieldsWriter.flushDocument and during DocumentsWriter.abort
  private static class FailOnlyOnAbortOrFlush extends MockDirectoryWrapper.Failure {
    private boolean onlyOnce;
    public FailOnlyOnAbortOrFlush(boolean onlyOnce) {
      this.onlyOnce = onlyOnce;
    }
    @Override
    public void eval(MockDirectoryWrapper dir)  throws IOException {
      if (doFail) {
        StackTraceElement[] trace = new Exception().getStackTrace();
        boolean sawAbortOrFlushDoc = false;
        boolean sawClose = false;
        for (int i = 0; i < trace.length; i++) {
          if ("abort".equals(trace[i].getMethodName()) ||
              "flushDocument".equals(trace[i].getMethodName())) {
            sawAbortOrFlushDoc = true;
          }
          if ("close".equals(trace[i].getMethodName())) {
            sawClose = true;
          }
        }
        if (sawAbortOrFlushDoc && !sawClose) {
          if (onlyOnce)
            doFail = false;
          //System.out.println(Thread.currentThread().getName() + ": now fail");
          //new Throwable().printStackTrace(System.out);
          throw new IOException("now failing on purpose");
        }
      }
    }
  }



  // LUCENE-1130: make sure initial IOException, and then 2nd
  // IOException during rollback(), is OK:
  public void testIOExceptionDuringAbort() throws IOException {
    _testSingleThreadFailure(new FailOnlyOnAbortOrFlush(false));
  }

  // LUCENE-1130: make sure initial IOException, and then 2nd
  // IOException during rollback(), is OK:
  public void testIOExceptionDuringAbortOnlyOnce() throws IOException {
    _testSingleThreadFailure(new FailOnlyOnAbortOrFlush(true));
  }

  // LUCENE-1130: make sure initial IOException, and then 2nd
  // IOException during rollback(), with multiple threads, is OK:
  public void testIOExceptionDuringAbortWithThreads() throws Exception {
    _testMultipleThreadsFailure(new FailOnlyOnAbortOrFlush(false));
  }

  // LUCENE-1130: make sure initial IOException, and then 2nd
  // IOException during rollback(), with multiple threads, is OK:
  public void testIOExceptionDuringAbortWithThreadsOnlyOnce() throws Exception {
    _testMultipleThreadsFailure(new FailOnlyOnAbortOrFlush(true));
  }

  // Throws IOException during DocumentsWriter.writeSegment
  private static class FailOnlyInWriteSegment extends MockDirectoryWrapper.Failure {
    private boolean onlyOnce;
    public FailOnlyInWriteSegment(boolean onlyOnce) {
      this.onlyOnce = onlyOnce;
    }
    @Override
    public void eval(MockDirectoryWrapper dir)  throws IOException {
      if (doFail) {
        StackTraceElement[] trace = new Exception().getStackTrace();
        for (int i = 0; i < trace.length; i++) {
          if ("flush".equals(trace[i].getMethodName()) && "org.apache.lucene.index.DocFieldProcessor".equals(trace[i].getClassName())) {
            if (onlyOnce)
              doFail = false;
            throw new IOException("now failing on purpose");
          }
        }
      }
    }
  }

  // LUCENE-1130: test IOException in writeSegment
  public void testIOExceptionDuringWriteSegment() throws IOException {
    _testSingleThreadFailure(new FailOnlyInWriteSegment(false));
  }

  // LUCENE-1130: test IOException in writeSegment
  public void testIOExceptionDuringWriteSegmentOnlyOnce() throws IOException {
    _testSingleThreadFailure(new FailOnlyInWriteSegment(true));
  }

  // LUCENE-1130: test IOException in writeSegment, with threads
  public void testIOExceptionDuringWriteSegmentWithThreads() throws Exception {
    _testMultipleThreadsFailure(new FailOnlyInWriteSegment(false));
  }

  // LUCENE-1130: test IOException in writeSegment, with threads
  public void testIOExceptionDuringWriteSegmentWithThreadsOnlyOnce() throws Exception {
    _testMultipleThreadsFailure(new FailOnlyInWriteSegment(true));
  }
}

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