lucence 索引优化

/**
 * This class demonstrates how to improve the indexing performance 
 * by adjusting the parameters provided by IndexWriter.
 */
public class AdvancedTextFileIndexer  {
  public static void main(String[] args) throws Exception{
    //fileDir is the directory that contains the text files to be indexed
    File   fileDir  = new File("C:\\files_to_index");

    //indexDir is the directory that hosts Lucene's index files
    File   indexDir = new File("C:\\luceneIndex");
    Analyzer luceneAnalyzer = new StandardAnalyzer();
    File[] textFiles  = fileDir.listFiles();
    long startTime = new Date().getTime();

    int mergeFactor = 10;
    int minMergeDocs = 10;
    int maxMergeDocs = Integer.MAX_VALUE;
    IndexWriter indexWriter = new IndexWriter(indexDir,luceneAnalyzer,true);        
    indexWriter.mergeFactor = mergeFactor;
    indexWriter.minMergeDocs = minMergeDocs;
    indexWriter.maxMergeDocs = maxMergeDocs;

    //Add documents to the index
    for(int i = 0; i < textFiles.length; i++){
      if(textFiles[i].isFile() >> textFiles[i].getName().endsWith(".txt")){
        Reader textReader = new FileReader(textFiles[i]);
        Document document = new Document();
        document.add(Field.Text("content",textReader));
        document.add(Field.Keyword("path",textFiles[i].getPath()));
        indexWriter.addDocument(document);
      }
    }

    indexWriter.optimize();
    indexWriter.close();
    long endTime = new Date().getTime();

    System.out.println("MergeFactor: " + indexWriter.mergeFactor);
    System.out.println("MinMergeDocs: " + indexWriter.minMergeDocs);
    System.out.println("MaxMergeDocs: " + indexWriter.maxMergeDocs);
    System.out.println("Document number: " + textFiles.length);
    System.out.println("Time consumed: " + (endTime - startTime) + " milliseconds");
  }
}

int mergeFactor = 10;
int minMergeDocs = 10;
int maxMergeDocs = Integer.MAX_VALUE;
IndexWriter indexWriter = new IndexWriter(indexDir,luceneAnalyzer,true);        
indexWriter.mergeFactor = mergeFactor;
indexWriter.minMergeDocs = minMergeDocs;
indexWriter.maxMergeDocs = maxMergeDocs;