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Lucene example source code file (TestIndexReaderOnDiskFull.java)

This example Lucene source code file (TestIndexReaderOnDiskFull.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, end_count, end_count, indexreader, indexreader, indexwriter, io, ioexception, ioexception, mockdirectorywrapper, start_count, term, termquery, verbose, verbose

The Lucene TestIndexReaderOnDiskFull.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.search.DefaultSimilarity;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.Similarity;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.store.MockDirectoryWrapper;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util._TestUtil;

public class TestIndexReaderOnDiskFull extends LuceneTestCase {
  /**
   * Make sure if reader tries to commit but hits disk
   * full that reader remains consistent and usable.
   */
  public void testDiskFull() throws IOException {

    Term searchTerm = new Term("content", "aaa");
    int START_COUNT = 157;
    int END_COUNT = 144;
    
    // First build up a starting index:
    MockDirectoryWrapper startDir = newDirectory();
    IndexWriter writer = new IndexWriter(startDir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    if (VERBOSE) {
      System.out.println("TEST: create initial index");
      writer.setInfoStream(System.out);
    }
    for(int i=0;i<157;i++) {
      Document d = new Document();
      d.add(newField("id", Integer.toString(i), Field.Store.YES, Field.Index.NOT_ANALYZED));
      d.add(newField("content", "aaa " + i, Field.Store.NO, Field.Index.ANALYZED));
      writer.addDocument(d);
      if (0==i%10)
        writer.commit();
    }
    writer.close();

    {
      IndexReader r = IndexReader.open(startDir);
      IndexSearcher searcher = newSearcher(r);
      ScoreDoc[] hits = null;
      try {
        hits = searcher.search(new TermQuery(searchTerm), null, 1000).scoreDocs;
      } catch (IOException e) {
        e.printStackTrace();
        fail("exception when init searching: " + e);
      }
      searcher.close();
      r.close();
    }

    long diskUsage = startDir.getRecomputedActualSizeInBytes();
    long diskFree = diskUsage+_TestUtil.nextInt(random, 50, 200);

    IOException err = null;

    boolean done = false;
    boolean gotExc = false;

    // Iterate w/ ever increasing free disk space:
    while(!done) {
      MockDirectoryWrapper dir = new MockDirectoryWrapper(random, new RAMDirectory(startDir));

      // If IndexReader hits disk full, it can write to
      // the same files again.
      dir.setPreventDoubleWrite(false);

      IndexReader reader = IndexReader.open(dir, false);

      // For each disk size, first try to commit against
      // dir that will hit random IOExceptions & disk
      // full; after, give it infinite disk space & turn
      // off random IOExceptions & retry w/ same reader:
      boolean success = false;

      for(int x=0;x<2;x++) {

        double rate = 0.05;
        double diskRatio = ((double) diskFree)/diskUsage;
        long thisDiskFree;
        String testName;

        if (0 == x) {
          thisDiskFree = diskFree;
          if (diskRatio >= 2.0) {
            rate /= 2;
          }
          if (diskRatio >= 4.0) {
            rate /= 2;
          }
          if (diskRatio >= 6.0) {
            rate = 0.0;
          }
          if (VERBOSE) {
            System.out.println("\ncycle: " + diskFree + " bytes");
          }
          testName = "disk full during reader.close() @ " + thisDiskFree + " bytes";
        } else {
          thisDiskFree = 0;
          rate = 0.0;
          if (VERBOSE) {
            System.out.println("\ncycle: same writer: unlimited disk space");
          }
          testName = "reader re-use after disk full";
        }

        dir.setMaxSizeInBytes(thisDiskFree);
        dir.setRandomIOExceptionRate(rate);
        Similarity sim = new DefaultSimilarity();
        try {
          if (0 == x) {
            int docId = 12;
            for(int i=0;i<13;i++) {
              reader.deleteDocument(docId);
              reader.setNorm(docId, "content", sim.encodeNormValue(2.0f));
              docId += 12;
            }
          }
          reader.close();
          success = true;
          if (0 == x) {
            done = true;
          }
        } catch (IOException e) {
          if (VERBOSE) {
            System.out.println("  hit IOException: " + e);
            e.printStackTrace(System.out);
          }
          err = e;
          gotExc = true;
          if (1 == x) {
            e.printStackTrace();
            fail(testName + " hit IOException after disk space was freed up");
          }
        }

        // Finally, verify index is not corrupt, and, if
        // we succeeded, we see all docs changed, and if
        // we failed, we see either all docs or no docs
        // changed (transactional semantics):
        IndexReader newReader = null;
        try {
          newReader = IndexReader.open(dir, false);
        } catch (IOException e) {
          e.printStackTrace();
          fail(testName + ":exception when creating IndexReader after disk full during close: " + e);
        }
        /*
        int result = newReader.docFreq(searchTerm);
        if (success) {
          if (result != END_COUNT) {
            fail(testName + ": method did not throw exception but docFreq('aaa') is " + result + " instead of expected " + END_COUNT);
          }
        } else {
          // On hitting exception we still may have added
          // all docs:
          if (result != START_COUNT && result != END_COUNT) {
            err.printStackTrace();
            fail(testName + ": method did throw exception but docFreq('aaa') is " + result + " instead of expected " + START_COUNT + " or " + END_COUNT);
          }
        }
        */

        IndexSearcher searcher = newSearcher(newReader);
        ScoreDoc[] hits = null;
        try {
          hits = searcher.search(new TermQuery(searchTerm), null, 1000).scoreDocs;
        } catch (IOException e) {
          e.printStackTrace();
          fail(testName + ": exception when searching: " + e);
        }
        int result2 = hits.length;
        if (success) {
          if (result2 != END_COUNT) {
            fail(testName + ": method did not throw exception but hits.length for search on term 'aaa' is " + result2 + " instead of expected " + END_COUNT);
          }
        } else {
          // On hitting exception we still may have added
          // all docs:
          if (result2 != START_COUNT && result2 != END_COUNT) {
            err.printStackTrace();
            fail(testName + ": method did throw exception but hits.length for search on term 'aaa' is " + result2 + " instead of expected " + START_COUNT);
          }
        }

        searcher.close();
        newReader.close();

        if (result2 == END_COUNT) {
          if (!gotExc)
            fail("never hit disk full");
          break;
        }
      }

      dir.close();

      // Try again with more bytes of free space:
      diskFree += TEST_NIGHTLY ? _TestUtil.nextInt(random, 5, 20) : _TestUtil.nextInt(random, 50, 200);
    }

    startDir.close();
  }
}

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