Examples of org.apache.lucene.index.LogMergePolicy

org.apache.lucene.index.LogMergePolicy

This class implements a {@link MergePolicy} that triesto merge segments into levels of exponentially increasing size, where each level has fewer segments than the value of the merge factor. Whenever extra segments (beyond the merge factor upper bound) are encountered, all segments within the level are merged. You can get or set the merge factor using {@link #getMergeFactor()} and{@link #setMergeFactor(int)} respectively.
This class is abstract and requires a subclass to define the {@link #size} method which specifies how asegment's size is determined. {@link LogDocMergePolicy}is one subclass that measures size by document count in the segment. {@link LogByteSizeMergePolicy} is anothersubclass that measures size as the total byte size of the file(s) for the segment.

      log("checkLastModified = " + checkLastModified, Project.MSG_VERBOSE);


      IndexWriterConfig conf = new IndexWriterConfig(
          Version.LUCENE_CURRENT, analyzer).setOpenMode(
          create ? OpenMode.CREATE : OpenMode.APPEND);
      LogMergePolicy lmp = (LogMergePolicy) conf.getMergePolicy();
      lmp.setUseCompoundFile(useCompoundIndex);
      lmp.setMergeFactor(mergeFactor);
      IndexWriter writer = new IndexWriter(dir, conf);
      int totalFiles = 0;
      int totalIndexed = 0;
      int totalIgnored = 0;
      try {

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    IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new WhitespaceAnalyzer(TEST_VERSION_CURRENT)).setMergeScheduler(new MyMergeScheduler())
        .setMaxBufferedDocs(2).setRAMBufferSizeMB(
            IndexWriterConfig.DISABLE_AUTO_FLUSH));
    LogMergePolicy logMP = (LogMergePolicy) writer.getConfig().getMergePolicy();
    logMP.setMergeFactor(10);
    for(int i=0;i<20;i++)
      writer.addDocument(doc);


    ((MyMergeScheduler) writer.getConfig().getMergeScheduler()).sync();
    writer.close();

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   * count lowish */
  public static void reduceOpenFiles(IndexWriter w) {
    // keep number of open files lowish
    MergePolicy mp = w.getConfig().getMergePolicy();
    if (mp instanceof LogMergePolicy) {
      LogMergePolicy lmp = (LogMergePolicy) mp;
      lmp.setMergeFactor(Math.min(5, lmp.getMergeFactor()));
    } else if (mp instanceof TieredMergePolicy) {
      TieredMergePolicy tmp = (TieredMergePolicy) mp;
      tmp.setMaxMergeAtOnce(Math.min(5, tmp.getMaxMergeAtOnce()));
      tmp.setSegmentsPerTier(Math.min(5, tmp.getSegmentsPerTier()));
    }

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  public static TieredMergePolicy newTieredMergePolicy() {
    return newTieredMergePolicy(random);
  }


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

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    tmp.setReclaimDeletesWeight(r.nextDouble()*4);
    return tmp;
  }


  public static LogMergePolicy newLogMergePolicy(boolean useCFS) {
    LogMergePolicy logmp = newLogMergePolicy();
    logmp.setUseCompoundFile(useCFS);
    return logmp;
  }

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    logmp.setUseCompoundFile(useCFS);
    return logmp;
  }


  public static LogMergePolicy newLogMergePolicy(boolean useCFS, int mergeFactor) {
    LogMergePolicy logmp = newLogMergePolicy();
    logmp.setUseCompoundFile(useCFS);
    logmp.setMergeFactor(mergeFactor);
    return logmp;
  }

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    logmp.setMergeFactor(mergeFactor);
    return logmp;
  }


  public static LogMergePolicy newLogMergePolicy(int mergeFactor) {
    LogMergePolicy logmp = newLogMergePolicy();
    logmp.setMergeFactor(mergeFactor);
    return logmp;
  }

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