Java 类org.apache.lucene.index.LogByteSizeMergePolicy 实例源码

项目：elasticsearch_my 文件：InternalEngineTests.java

public void testSyncedFlush() throws IOException {
    try (Store store = createStore();
        Engine engine = new InternalEngine(config(defaultSettings, store, createTempDir(),
                 new LogByteSizeMergePolicy(), IndexRequest.UNSET_AUTO_GENERATED_TIMESTAMP, null))) {
        final String syncId = randomUnicodeOfCodepointLengthBetween(10, 20);
        ParsedDocument doc = testParsedDocument("1", "test", null, testDocumentWithTextField(), B_1, null);
        engine.index(indexForDoc(doc));
        Engine.CommitId commitID = engine.flush();
        assertThat(commitID, equalTo(new Engine.CommitId(store.readLastCommittedSegmentsInfo().getId())));
        byte[] wrongBytes = Base64.getDecoder().decode(commitID.toString());
        wrongBytes[0] = (byte) ~wrongBytes[0];
        Engine.CommitId wrongId = new Engine.CommitId(wrongBytes);
        assertEquals("should fail to sync flush with wrong id (but no docs)", engine.syncFlush(syncId + "1", wrongId),
                Engine.SyncedFlushResult.COMMIT_MISMATCH);
        engine.index(indexForDoc(doc));
        assertEquals("should fail to sync flush with right id but pending doc", engine.syncFlush(syncId + "2", commitID),
                Engine.SyncedFlushResult.PENDING_OPERATIONS);
        commitID = engine.flush();
        assertEquals("should succeed to flush commit with right id and no pending doc", engine.syncFlush(syncId, commitID),
                Engine.SyncedFlushResult.SUCCESS);
        assertEquals(store.readLastCommittedSegmentsInfo().getUserData().get(Engine.SYNC_COMMIT_ID), syncId);
        assertEquals(engine.getLastCommittedSegmentInfos().getUserData().get(Engine.SYNC_COMMIT_ID), syncId);
    }
}

项目：neo4j-lucene5-index 文件：IndexWriterFactories.java

private static IndexWriterConfig standardConfig()
{
    IndexWriterConfig writerConfig = new IndexWriterConfig( LuceneDataSource.KEYWORD_ANALYZER );

    writerConfig.setMaxBufferedDocs( 100000 ); // TODO figure out depending on environment?
    writerConfig.setIndexDeletionPolicy( new MultipleBackupDeletionPolicy() );
    writerConfig.setUseCompoundFile( true );

    // TODO: TieredMergePolicy & possibly SortingMergePolicy
    LogByteSizeMergePolicy mergePolicy = new LogByteSizeMergePolicy();
    mergePolicy.setNoCFSRatio( 1.0 );
    mergePolicy.setMinMergeMB( 0.1 );
    mergePolicy.setMergeFactor( 2 );
    writerConfig.setMergePolicy( mergePolicy );

    return writerConfig;
}

项目：gitcommitviewer 文件：DefaultLuceneIndexAccessor.java

public IndexWriter getIndexWriter(String path, boolean create, Analyzer analyzer) throws IOException {
    // Everything in this method copied from LuceneUtils
    try {
        createDirRobust(path);

        final IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_32, analyzer);
        config.setOpenMode(create ? OpenMode.CREATE : OpenMode.APPEND);
        LogByteSizeMergePolicy mergePolicy = new LogByteSizeMergePolicy();
        mergePolicy.setUseCompoundFile(true);
        config.setMergePolicy(mergePolicy);
        return new IndexWriter(getDirectory(path), config);
    } catch (final IOException e) {
        LOG.error("Problem with path " + path + ": " + e.getMessage(), e);
        throw new IOException("Problem with path " + path + ": " + e.getMessage(), e);
    }
}

项目：elasticsearch_my 文件：AbstractFieldDataTestCase.java

@Before
public void setup() throws Exception {
    Version version = VersionUtils.randomVersionBetween(random(), Version.V_2_0_0, Version.V_2_3_0); // we need 2.x so that fielddata is allowed on string fields
    Settings settings = Settings.builder().put(IndexMetaData.SETTING_VERSION_CREATED, version).build();
    indexService = createIndex("test", settings);
    mapperService = indexService.mapperService();
    indicesFieldDataCache = getInstanceFromNode(IndicesService.class).getIndicesFieldDataCache();
    ifdService = indexService.fieldData();
    // LogByteSizeMP to preserve doc ID order
    writer = new IndexWriter(new RAMDirectory(), new IndexWriterConfig(new StandardAnalyzer()).setMergePolicy(new LogByteSizeMergePolicy()));
}

项目：everywhere 文件：IndexUtil.java

public static IndexWriter getIndexWriter(String indexPath, boolean create) throws IOException {
    Directory dir = FSDirectory.open(Paths.get(indexPath));
    Analyzer analyzer = new SmartChineseAnalyzer();
    IndexWriterConfig iwc = new IndexWriterConfig(analyzer);
    LogMergePolicy mergePolicy = new LogByteSizeMergePolicy();
    mergePolicy.setMergeFactor(50);
    mergePolicy.setMaxMergeDocs(5000);
    if (create){
        iwc.setOpenMode(IndexWriterConfig.OpenMode.CREATE);
    } else {
        iwc.setOpenMode(IndexWriterConfig.OpenMode.CREATE_OR_APPEND);
    }
    return new IndexWriter(dir, iwc);
}

项目：search 文件：LuceneTestCase.java

public static LogMergePolicy newLogMergePolicy(Random r) {
  LogMergePolicy logmp = r.nextBoolean() ? new LogDocMergePolicy() : new LogByteSizeMergePolicy();
  logmp.setCalibrateSizeByDeletes(r.nextBoolean());
  if (rarely(r)) {
    logmp.setMergeFactor(TestUtil.nextInt(r, 2, 9));
  } else {
    logmp.setMergeFactor(TestUtil.nextInt(r, 10, 50));
  }
  configureRandom(r, logmp);
  return logmp;
}

项目：search 文件：TestMergePolicyConfig.java

public void testLogMergePolicyConfig() throws Exception {

  final Class<? extends LogMergePolicy> mpClass = random().nextBoolean()
    ? LogByteSizeMergePolicy.class : LogDocMergePolicy.class;

  System.setProperty("solr.test.log.merge.policy", mpClass.getName());

  initCore("solrconfig-logmergepolicy.xml","schema-minimal.xml");
  IndexWriterConfig iwc = solrConfig.indexConfig.toIndexWriterConfig(h.getCore().getLatestSchema());

  // verify some props set to -1 get lucene internal defaults
  assertEquals(-1, solrConfig.indexConfig.maxBufferedDocs);
  assertEquals(IndexWriterConfig.DISABLE_AUTO_FLUSH, 
               iwc.getMaxBufferedDocs());
  assertEquals(-1, solrConfig.indexConfig.maxIndexingThreads);
  assertEquals(IndexWriterConfig.DEFAULT_MAX_THREAD_STATES, 
               iwc.getMaxThreadStates());
  assertEquals(-1, solrConfig.indexConfig.ramBufferSizeMB, 0.0D);
  assertEquals(IndexWriterConfig.DEFAULT_RAM_BUFFER_SIZE_MB, 
               iwc.getRAMBufferSizeMB(), 0.0D);


  LogMergePolicy logMP = assertAndCast(mpClass, iwc.getMergePolicy());

  // set by legacy <mergeFactor> setting
  assertEquals(11, logMP.getMergeFactor());
  // set by legacy <maxMergeDocs> setting
  assertEquals(456, logMP.getMaxMergeDocs());

}

项目：OTF-Query-Services 文件：LuceneIndexer.java

public LuceneIndexer(String indexName) throws IOException {
    this.indexName = indexName;
    luceneWriterService = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors(),
            new NamedThreadFactory(threadGroup, indexName + " Lucene writer"));
    luceneWriterFutureCheckerService = Executors.newFixedThreadPool(1,
            new NamedThreadFactory(threadGroup, indexName + " Lucene future checker"));
    setupRoot();

    File indexDirectoryFile = new File(root.getPath() + "/" + indexName);
    System.out.println("Index: " + indexDirectoryFile);
    Directory indexDirectory = initDirectory(indexDirectoryFile);

    indexDirectory.clearLock("write.lock");

    IndexWriterConfig config = new IndexWriterConfig(luceneVersion, new StandardAnalyzer(luceneVersion));
    MergePolicy mergePolicy = new LogByteSizeMergePolicy();

    config.setMergePolicy(mergePolicy);
    config.setSimilarity(new ShortTextSimilarity());

    IndexWriter indexWriter = new IndexWriter(indexDirectory, config);

    trackingIndexWriter = new NRTManager.TrackingIndexWriter(indexWriter);

    boolean applyAllDeletes = false;

    searcherManager = new NRTManager(trackingIndexWriter, null, applyAllDeletes);

    // Refreshes searcher every 5 seconds when nobody is waiting, and up to 100 msec delay
    // when somebody is waiting:
    reopenThread = new NRTManagerReopenThread(searcherManager, 5.0, 0.1);
    this.startThread();

}

项目：search 文件：TestDirectoryTaxonomyReader.java

@Test
public void testOpenIfChangedMergedSegment() throws Exception {
  // test openIfChanged() when all index segments were merged - used to be
  // a bug in ParentArray, caught by testOpenIfChangedManySegments - only
  // this test is not random
  Directory dir = newDirectory();

  // hold onto IW to forceMerge
  // note how we don't close it, since DTW will close it.
  final IndexWriter iw = new IndexWriter(dir,
      new IndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()))
          .setMergePolicy(new LogByteSizeMergePolicy()));
  DirectoryTaxonomyWriter writer = new DirectoryTaxonomyWriter(dir) {
    @Override
    protected IndexWriter openIndexWriter(Directory directory,
        IndexWriterConfig config) throws IOException {
      return iw;
    }
  };

  TaxonomyReader reader = new DirectoryTaxonomyReader(writer);
  assertEquals(1, reader.getSize());
  assertEquals(1, reader.getParallelTaxonomyArrays().parents().length);

  // add category and call forceMerge -- this should flush IW and merge segments down to 1
  // in ParentArray.initFromReader, this used to fail assuming there are no parents.
  writer.addCategory(new FacetLabel("1"));
  iw.forceMerge(1);

  // now calling openIfChanged should trip on the bug
  TaxonomyReader newtr = TaxonomyReader.openIfChanged(reader);
  assertNotNull(newtr);
  reader.close();
  reader = newtr;
  assertEquals(2, reader.getSize());
  assertEquals(2, reader.getParallelTaxonomyArrays().parents().length);

  reader.close();
  writer.close();
  dir.close();
}

项目：search 文件：TestDirectoryTaxonomyReader.java

@Test
public void testOpenIfChangedNoChangesButSegmentMerges() throws Exception {
  // test openIfChanged() when the taxonomy hasn't really changed, but segments
  // were merged. The NRT reader will be reopened, and ParentArray used to assert
  // that the new reader contains more ordinals than were given from the old
  // TaxReader version
  Directory dir = newDirectory();

  // hold onto IW to forceMerge
  // note how we don't close it, since DTW will close it.
  final IndexWriter iw = new IndexWriter(dir,
      new IndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()))
          .setMergePolicy(new LogByteSizeMergePolicy()));
  DirectoryTaxonomyWriter writer = new DirectoryTaxonomyWriter(dir) {
    @Override
    protected IndexWriter openIndexWriter(Directory directory,
        IndexWriterConfig config) throws IOException {
      return iw;
    }
  };

  // add a category so that the following DTR open will cause a flush and 
  // a new segment will be created
  writer.addCategory(new FacetLabel("a"));

  TaxonomyReader reader = new DirectoryTaxonomyReader(writer);
  assertEquals(2, reader.getSize());
  assertEquals(2, reader.getParallelTaxonomyArrays().parents().length);

  // merge all the segments so that NRT reader thinks there's a change 
  iw.forceMerge(1);

  // now calling openIfChanged should trip on the wrong assert in ParetArray's ctor
  TaxonomyReader newtr = TaxonomyReader.openIfChanged(reader);
  assertNotNull(newtr);
  reader.close();
  reader = newtr;
  assertEquals(2, reader.getSize());
  assertEquals(2, reader.getParallelTaxonomyArrays().parents().length);

  reader.close();
  writer.close();
  dir.close();
}

项目：NYBC 文件：TestDirectoryTaxonomyReader.java

@Test
public void testOpenIfChangedMergedSegment() throws Exception {
  // test openIfChanged() when all index segments were merged - used to be
  // a bug in ParentArray, caught by testOpenIfChangedManySegments - only
  // this test is not random
  Directory dir = newDirectory();

  // hold onto IW to forceMerge
  // note how we don't close it, since DTW will close it.
  final IndexWriter iw = new IndexWriter(dir,
      new IndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()))
          .setMergePolicy(new LogByteSizeMergePolicy()));
  DirectoryTaxonomyWriter writer = new DirectoryTaxonomyWriter(dir) {
    @Override
    protected IndexWriter openIndexWriter(Directory directory,
        IndexWriterConfig config) throws IOException {
      return iw;
    }
  };

  TaxonomyReader reader = new DirectoryTaxonomyReader(writer);
  assertEquals(1, reader.getSize());
  assertEquals(1, reader.getParallelTaxonomyArrays().parents().length);

  // add category and call forceMerge -- this should flush IW and merge segments down to 1
  // in ParentArray.initFromReader, this used to fail assuming there are no parents.
  writer.addCategory(new CategoryPath("1"));
  iw.forceMerge(1);

  // now calling openIfChanged should trip on the bug
  TaxonomyReader newtr = TaxonomyReader.openIfChanged(reader);
  assertNotNull(newtr);
  reader.close();
  reader = newtr;
  assertEquals(2, reader.getSize());
  assertEquals(2, reader.getParallelTaxonomyArrays().parents().length);

  reader.close();
  writer.close();
  dir.close();
}

项目：NYBC 文件：TestDirectoryTaxonomyReader.java

@Test
public void testOpenIfChangedNoChangesButSegmentMerges() throws Exception {
  // test openIfChanged() when the taxonomy hasn't really changed, but segments
  // were merged. The NRT reader will be reopened, and ParentArray used to assert
  // that the new reader contains more ordinals than were given from the old
  // TaxReader version
  Directory dir = newDirectory();

  // hold onto IW to forceMerge
  // note how we don't close it, since DTW will close it.
  final IndexWriter iw = new IndexWriter(dir,
      new IndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()))
          .setMergePolicy(new LogByteSizeMergePolicy()));
  DirectoryTaxonomyWriter writer = new DirectoryTaxonomyWriter(dir) {
    @Override
    protected IndexWriter openIndexWriter(Directory directory,
        IndexWriterConfig config) throws IOException {
      return iw;
    }
  };

  // add a category so that the following DTR open will cause a flush and 
  // a new segment will be created
  writer.addCategory(new CategoryPath("a"));

  TaxonomyReader reader = new DirectoryTaxonomyReader(writer);
  assertEquals(2, reader.getSize());
  assertEquals(2, reader.getParallelTaxonomyArrays().parents().length);

  // merge all the segments so that NRT reader thinks there's a change 
  iw.forceMerge(1);

  // now calling openIfChanged should trip on the wrong assert in ParetArray's ctor
  TaxonomyReader newtr = TaxonomyReader.openIfChanged(reader);
  assertNotNull(newtr);
  reader.close();
  reader = newtr;
  assertEquals(2, reader.getSize());
  assertEquals(2, reader.getParallelTaxonomyArrays().parents().length);

  reader.close();
  writer.close();
  dir.close();
}

项目：Maskana-Gestor-de-Conocimiento 文件：TestDirectoryTaxonomyReader.java

@Test
public void testOpenIfChangedMergedSegment() throws Exception {
  // test openIfChanged() when all index segments were merged - used to be
  // a bug in ParentArray, caught by testOpenIfChangedManySegments - only
  // this test is not random
  Directory dir = newDirectory();

  // hold onto IW to forceMerge
  // note how we don't close it, since DTW will close it.
  final IndexWriter iw = new IndexWriter(dir,
      new IndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()))
          .setMergePolicy(new LogByteSizeMergePolicy()));
  DirectoryTaxonomyWriter writer = new DirectoryTaxonomyWriter(dir) {
    @Override
    protected IndexWriter openIndexWriter(Directory directory,
        IndexWriterConfig config) throws IOException {
      return iw;
    }
  };

  TaxonomyReader reader = new DirectoryTaxonomyReader(writer);
  assertEquals(1, reader.getSize());
  assertEquals(1, reader.getParallelTaxonomyArrays().parents().length);

  // add category and call forceMerge -- this should flush IW and merge segments down to 1
  // in ParentArray.initFromReader, this used to fail assuming there are no parents.
  writer.addCategory(new CategoryPath("1"));
  iw.forceMerge(1);

  // now calling openIfChanged should trip on the bug
  TaxonomyReader newtr = TaxonomyReader.openIfChanged(reader);
  assertNotNull(newtr);
  reader.close();
  reader = newtr;
  assertEquals(2, reader.getSize());
  assertEquals(2, reader.getParallelTaxonomyArrays().parents().length);

  reader.close();
  writer.close();
  dir.close();
}

项目：Maskana-Gestor-de-Conocimiento 文件：TestDirectoryTaxonomyReader.java

@Test
public void testOpenIfChangedNoChangesButSegmentMerges() throws Exception {
  // test openIfChanged() when the taxonomy hasn't really changed, but segments
  // were merged. The NRT reader will be reopened, and ParentArray used to assert
  // that the new reader contains more ordinals than were given from the old
  // TaxReader version
  Directory dir = newDirectory();

  // hold onto IW to forceMerge
  // note how we don't close it, since DTW will close it.
  final IndexWriter iw = new IndexWriter(dir,
      new IndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()))
          .setMergePolicy(new LogByteSizeMergePolicy()));
  DirectoryTaxonomyWriter writer = new DirectoryTaxonomyWriter(dir) {
    @Override
    protected IndexWriter openIndexWriter(Directory directory,
        IndexWriterConfig config) throws IOException {
      return iw;
    }
  };

  // add a category so that the following DTR open will cause a flush and 
  // a new segment will be created
  writer.addCategory(new CategoryPath("a"));

  TaxonomyReader reader = new DirectoryTaxonomyReader(writer);
  assertEquals(2, reader.getSize());
  assertEquals(2, reader.getParallelTaxonomyArrays().parents().length);

  // merge all the segments so that NRT reader thinks there's a change 
  iw.forceMerge(1);

  // now calling openIfChanged should trip on the wrong assert in ParetArray's ctor
  TaxonomyReader newtr = TaxonomyReader.openIfChanged(reader);
  assertNotNull(newtr);
  reader.close();
  reader = newtr;
  assertEquals(2, reader.getSize());
  assertEquals(2, reader.getParallelTaxonomyArrays().parents().length);

  reader.close();
  writer.close();
  dir.close();
}

项目：search 文件：DirectoryTaxonomyWriter.java

/**
 * Create the {@link IndexWriterConfig} that would be used for opening the internal index writer.
 * <br>Extensions can configure the {@link IndexWriter} as they see fit,
 * including setting a {@link org.apache.lucene.index.MergeScheduler merge-scheduler}, or
 * {@link org.apache.lucene.index.IndexDeletionPolicy deletion-policy}, different RAM size
 * etc.<br>
 * <br><b>NOTE:</b> internal docids of the configured index must not be altered.
 * For that, categories are never deleted from the taxonomy index.
 * In addition, merge policy in effect must not merge none adjacent segments.
 * 
 * @see #openIndexWriter(Directory, IndexWriterConfig)
 * 
 * @param openMode see {@link OpenMode}
 */
protected IndexWriterConfig createIndexWriterConfig(OpenMode openMode) {
  // TODO: should we use a more optimized Codec, e.g. Pulsing (or write custom)?
  // The taxonomy has a unique structure, where each term is associated with one document

  // :Post-Release-Update-Version.LUCENE_XY:
  // Make sure we use a MergePolicy which always merges adjacent segments and thus
  // keeps the doc IDs ordered as well (this is crucial for the taxonomy index).
  return new IndexWriterConfig(Version.LUCENE_4_10_0,
      null).setOpenMode(openMode).setMergePolicy(
      new LogByteSizeMergePolicy());
}

项目：NYBC 文件：DirectoryTaxonomyWriter.java

/**
 * Create the {@link IndexWriterConfig} that would be used for opening the internal index writer.
 * <br>Extensions can configure the {@link IndexWriter} as they see fit,
 * including setting a {@link org.apache.lucene.index.MergeScheduler merge-scheduler}, or
 * {@link org.apache.lucene.index.IndexDeletionPolicy deletion-policy}, different RAM size
 * etc.<br>
 * <br><b>NOTE:</b> internal docids of the configured index must not be altered.
 * For that, categories are never deleted from the taxonomy index.
 * In addition, merge policy in effect must not merge none adjacent segments.
 * 
 * @see #openIndexWriter(Directory, IndexWriterConfig)
 * 
 * @param openMode see {@link OpenMode}
 */
protected IndexWriterConfig createIndexWriterConfig(OpenMode openMode) {
  // TODO: should we use a more optimized Codec, e.g. Pulsing (or write custom)?
  // The taxonomy has a unique structure, where each term is associated with one document

  // Make sure we use a MergePolicy which always merges adjacent segments and thus
  // keeps the doc IDs ordered as well (this is crucial for the taxonomy index).
  return new IndexWriterConfig(Version.LUCENE_42,
      null).setOpenMode(openMode).setMergePolicy(
      new LogByteSizeMergePolicy());
}

项目：read-open-source-code 文件：DirectoryTaxonomyWriter.java

/**
 * Create the {@link IndexWriterConfig} that would be used for opening the internal index writer.
 * <br>Extensions can configure the {@link IndexWriter} as they see fit,
 * including setting a {@link org.apache.lucene.index.MergeScheduler merge-scheduler}, or
 * {@link org.apache.lucene.index.IndexDeletionPolicy deletion-policy}, different RAM size
 * etc.<br>
 * <br><b>NOTE:</b> internal docids of the configured index must not be altered.
 * For that, categories are never deleted from the taxonomy index.
 * In addition, merge policy in effect must not merge none adjacent segments.
 * 
 * @see #openIndexWriter(Directory, IndexWriterConfig)
 * 
 * @param openMode see {@link OpenMode}
 */
protected IndexWriterConfig createIndexWriterConfig(OpenMode openMode) {
  // TODO: should we use a more optimized Codec, e.g. Pulsing (or write custom)?
  // The taxonomy has a unique structure, where each term is associated with one document

  // :Post-Release-Update-Version.LUCENE_XY:
  // Make sure we use a MergePolicy which always merges adjacent segments and thus
  // keeps the doc IDs ordered as well (this is crucial for the taxonomy index).
  return new IndexWriterConfig(Version.LUCENE_47,
      null).setOpenMode(openMode).setMergePolicy(
      new LogByteSizeMergePolicy());
}

项目：read-open-source-code 文件：DirectoryTaxonomyWriter.java

/**
 * Create the {@link IndexWriterConfig} that would be used for opening the internal index writer.
 * <br>Extensions can configure the {@link IndexWriter} as they see fit,
 * including setting a {@link org.apache.lucene.index.MergeScheduler merge-scheduler}, or
 * {@link org.apache.lucene.index.IndexDeletionPolicy deletion-policy}, different RAM size
 * etc.<br>
 * <br><b>NOTE:</b> internal docids of the configured index must not be altered.
 * For that, categories are never deleted from the taxonomy index.
 * In addition, merge policy in effect must not merge none adjacent segments.
 * 
 * @see #openIndexWriter(Directory, IndexWriterConfig)
 * 
 * @param openMode see {@link OpenMode}
 */
protected IndexWriterConfig createIndexWriterConfig(OpenMode openMode) {
  // TODO: should we use a more optimized Codec, e.g. Pulsing (or write custom)?
  // The taxonomy has a unique structure, where each term is associated with one document

  // :Post-Release-Update-Version.LUCENE_XY:
  // Make sure we use a MergePolicy which always merges adjacent segments and thus
  // keeps the doc IDs ordered as well (this is crucial for the taxonomy index).
  return new IndexWriterConfig(Version.LUCENE_47,
      null).setOpenMode(openMode).setMergePolicy(
      new LogByteSizeMergePolicy());
}

项目：read-open-source-code 文件：DirectoryTaxonomyWriter.java

/**
 * Create the {@link IndexWriterConfig} that would be used for opening the internal index writer.
 * <br>Extensions can configure the {@link IndexWriter} as they see fit,
 * including setting a {@link org.apache.lucene.index.MergeScheduler merge-scheduler}, or
 * {@link org.apache.lucene.index.IndexDeletionPolicy deletion-policy}, different RAM size
 * etc.<br>
 * <br><b>NOTE:</b> internal docids of the configured index must not be altered.
 * For that, categories are never deleted from the taxonomy index.
 * In addition, merge policy in effect must not merge none adjacent segments.
 * 
 * @see #openIndexWriter(Directory, IndexWriterConfig)
 * 
 * @param openMode see {@link OpenMode}
 */
protected IndexWriterConfig createIndexWriterConfig(OpenMode openMode) {
  // TODO: should we use a more optimized Codec, e.g. Pulsing (or write custom)?
  // The taxonomy has a unique structure, where each term is associated with one document

  // :Post-Release-Update-Version.LUCENE_XY:
  // Make sure we use a MergePolicy which always merges adjacent segments and thus
  // keeps the doc IDs ordered as well (this is crucial for the taxonomy index).
  return new IndexWriterConfig(Version.LUCENE_4_10_0,
      null).setOpenMode(openMode).setMergePolicy(
      new LogByteSizeMergePolicy());
}

项目：Maskana-Gestor-de-Conocimiento 文件：DirectoryTaxonomyWriter.java

/**
 * Create the {@link IndexWriterConfig} that would be used for opening the internal index writer.
 * <br>Extensions can configure the {@link IndexWriter} as they see fit,
 * including setting a {@link org.apache.lucene.index.MergeScheduler merge-scheduler}, or
 * {@link org.apache.lucene.index.IndexDeletionPolicy deletion-policy}, different RAM size
 * etc.<br>
 * <br><b>NOTE:</b> internal docids of the configured index must not be altered.
 * For that, categories are never deleted from the taxonomy index.
 * In addition, merge policy in effect must not merge none adjacent segments.
 * 
 * @see #openIndexWriter(Directory, IndexWriterConfig)
 * 
 * @param openMode see {@link OpenMode}
 */
protected IndexWriterConfig createIndexWriterConfig(OpenMode openMode) {
  // TODO: should we use a more optimized Codec, e.g. Pulsing (or write custom)?
  // The taxonomy has a unique structure, where each term is associated with one document

  // Make sure we use a MergePolicy which always merges adjacent segments and thus
  // keeps the doc IDs ordered as well (this is crucial for the taxonomy index).
  return new IndexWriterConfig(Version.LUCENE_43,
      null).setOpenMode(openMode).setMergePolicy(
      new LogByteSizeMergePolicy());
}