Java 基于Geode的Apache-Lucene-LatLonPoint查询

我试图在一个在测地区域上创建的Lucene索引上索引一些地理空间数据，并使用Lucene的LatLonPoint类查询方法（如newDistanceQuery或newPolygonQuery方法）对这些数据运行查询。运行应用程序一次返回正确的结果，但当我第二次运行代码时，会出现以下异常：

org.apache.lucene.index.IndexNotFoundException: 
no segments* file found in RegionDirectory@4218500f lockFactory=
org.apache.lucene.store.SingleInstanceLockFactory@4bff64c2: files: []

以下是课程：

Server.java

public class Server {
final static Logger _logger = LoggerFactory.getLogger(Server.class);

public static void main(String[] args) throws InterruptedException {
    startServer();
}

/** Start a Geode Cache Server with a locator */
public static void startServer() throws InterruptedException {
    ServerLauncher serverLauncher = new ServerLauncher.Builder()
            .setMemberName("server1")
            .setServerPort(40404)
            .set("start-locator", "127.0.0.1[10334]")
            .set("jmx-manager", "true")
            .set("jmx-manager-start", "true")
            .build();

    ServerLauncher.ServerState state = serverLauncher.start();
    _logger.info(state.toString());

    Cache cache = new CacheFactory().create();
    createLuceneIndex(cache);
    cache.createRegionFactory(RegionShortcut.PARTITION).create("locationsRegion");
}

/** Create a Lucene Index with given cache */
public static void createLuceneIndex(Cache cache) throws InterruptedException {
    LuceneService luceneService = LuceneServiceProvider.get(cache);
    luceneService.createIndexFactory()
            .addField("NAME")
            .addField("LOCATION")
            .addField("COORDINATES")
            .create("locationsIndex", "locationsRegion");
}
}

Client.java

public class Client {
private static ClientCache cache;
private static Region<Integer, Document> region;

public static void main(String[] args) throws LuceneQueryException, InterruptedException, IOException {
    init();
    indexFiles();
    search();
}

/** Initialize the client cache and region */
private static void init() {
    cache = new ClientCacheFactory()
            .addPoolLocator("localhost", 10334)
            .create();

    if (cache != null) {
        region = cache.<Integer, Document>createClientRegionFactory(
                ClientRegionShortcut.CACHING_PROXY).create("locationsRegion");
    } else {
        throw new NullPointerException("Client cache is null");
    }
}

/** Add documents to the Lucene index */
private static void indexFiles() {
    // Dummy data
    List<Document> locations = Arrays.asList(
            DocumentBuilder.newSampleDocument("Exastax", 40.984929, 29.133506),
            DocumentBuilder.newSampleDocument("Galata Tower", 41.025826, 28.974378),
            DocumentBuilder.newSampleDocument("St. Peter and St. Paul Church", 41.024757, 28.972950));

    // Standart IndexWriter initialization.
    Analyzer analyzer = new StandardAnalyzer();
    // Create a directory from geode region
    Directory directory = RawLucene.returnRegionDirectory(cache, region, "locationsIndex");
    IndexWriterConfig indexWriterConfig = new IndexWriterConfig(analyzer);
    IndexWriter indexWriter;
    try {
        indexWriter = new IndexWriter(directory, indexWriterConfig);
        indexWriter.addDocuments(locations);
        indexWriter.commit();
        indexWriter.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

/** Search in the Lucene index */
private static void search() {
    try {
        DirectoryReader reader = DirectoryReader.open(RawLucene.returnRegionDirectory(cache, region, "locationsIndex"));
        IndexSearcher indexSearcher = new IndexSearcher(reader);

        Query query = LatLonPoint.newDistanceQuery("COORDINATES", 41.024873, 28.974346, 500);
        ScoreDoc[] scoreDocs = indexSearcher.search(query, 10).scoreDocs;
        for (int i = 0; i < scoreDocs.length; i++) {
            Document doc = indexSearcher.doc(scoreDocs[i].doc);
            System.out.println(doc.get("NAME") + " --- " + doc.get("LOCATION"));
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}
}

DocumentBuilder.java

public class DocumentBuilder {
public static Document newSampleDocument(String name, Double lat, Double lon) {
    Document document = new Document();
    document.add(new StoredField("NAME", name));
    document.add(new StoredField("LOCATION", lat + " " + lon));
    document.add(new LatLonPoint("COORDINATES", lat, lon));
    return document;
}
}

以下是我启动应用程序的方式：

运行服务器类 在初始运行时使用所有三个方法运行客户机类。工作正常并返回正确的结果 运行客户机类而不调用indexFiles方法。第二轮。这就是我得到例外的地方

---

为什么代码第一次运行正常，第二次运行时抛出异常？

看起来您将geode的公共API与内部类RegionDirectory混合使用。公共API只支持通过直接向区域添加对象和使用LuceneService.createQueryFactory进行查询来添加文档

geode-lucene模块确实在内部使用RegionDirectory，但它的使用方式与您使用的略有不同——它不是从客户端包装整个区域，而是在服务器端包装各个存储桶

我认为这里发生的事情是RegionDirectory和底层文件系统类正在使用一些GeodeAPI，当您在客户机上调用它们时，它们的行为会有所不同。特别是，我认为当FileSystem类查找文件时，它使用Region.keySet，它与缓存客户端一起将返回客户端缓存的文件列表。我想这就解释了为什么你会得到关于没有文件的错误

遗憾的是RegionDirectory不是一个公共API，并且不支持您尝试使用它的方式，因为这看起来是一个很好的用例

public class DocumentBuilder {
public static Document newSampleDocument(String name, Double lat, Double lon) {
    Document document = new Document();
    document.add(new StoredField("NAME", name));
    document.add(new StoredField("LOCATION", lat + " " + lon));
    document.add(new LatLonPoint("COORDINATES", lat, lon));
    return document;
}
}