Question

此代码使用Lucene.NET测试索引。

for (int i = 0; i < 10; i++)
{
    var stopwatch = Stopwatch.StartNew();
    string indexPath = Path.Combine("C:\\lucene\\");
    var directory = FSDirectory.Open(new DirectoryInfo(indexPath));
    var analyzer = new StandardAnalyzer(LuceneConfiguration.Version);

    IndexWriter indexWriter = null;
    try
    {
        indexWriter = new IndexWriter(directory, analyzer, true,
                                        IndexWriter.MaxFieldLength.UNLIMITED);
        indexWriter.DeleteAll();

        for (int documentNumber = 0; documentNumber < 100; documentNumber++)
        {
            var document = new Document();
            for (int fieldNumber = 0; fieldNumber < 10; fieldNumber++)
            {
                document.Add(new Field("Field" + fieldNumber, "asdf qwerty Value" + fieldNumber, Field.Store.YES,
                                        Field.Index.ANALYZED));
            }
            indexWriter.AddDocument(document);
        }

        indexWriter.Optimize();
    }
    finally
    {
        if (indexWriter != null)
        {
            indexWriter.Close();
        }
    }
    stopwatch.Stop();
    Console.WriteLine("Index time: " + stopwatch.Elapsed.TotalMilliseconds);


    var reader = IndexReader.Open(directory, true);
    var searcher = new IndexSearcher(reader);
    var parser = new QueryParser(LuceneConfiguration.Version, "Field0", analyzer);

    var query = parser.Parse("asdf");

    var collector = TopScoreDocCollector.create(10, true);

    searcher.Search(query, collector);

    Console.WriteLine("Hits: " + collector.GetTotalHits());
}

Console.ReadKey();

每次索引运行时，索引都会越来越慢。如果我在索引后跳过搜索，它就不会变慢。这只有在我通过调试启动它时才会发生。如果我没有调试就启动它。

可能导致这种情况的原因是什么？

Answer 1

我想知道这是否是Lucene尝试自动清除索引目录时发生IOExceptions的第一次机会。这些都会发生，因为您的读者/搜索者仍处于打开状态，并锁定段文件以进行删除。

每次Lucene索引运行时，它都会越来越慢

1 个答案: