Question

我真的在努力使用这个新的API，而且缺乏像NRT Manager这样的核心内容的例子。

我按照this示例，这是最终结果：

这就是NRT管理器的构建方式：

analyzer = new StopAnalyzer(Version.LUCENE_40);
config = new IndexWriterConfig(Version.LUCENE_40, analyzer);
writer = new IndexWriter(FSDirectory.open(new File(ConfigUtil.getProperty("lucene.directory"))), config);
mgrWriter = new NRTManager.TrackingIndexWriter(writer);
ReferenceManager<IndexSearcher> mgr = new NRTManager(mgrWriter, new SearcherFactory(), true);

向NRT Manager的编剧添加新元素：

long gen = -1;
try{
    Document userDoc = DocumentManager.getDocument(user);
    gen = mgrWriter.addDocument(userDoc);
} catch (Exception e) {}
return gen;

经过一段时间后，我需要更新上一份文件：

// Acquire a searcher from the NRTManager. I am using the generation obtained in the creation step
((NRTManager)mgr).waitForGeneration(gen);
searcher = mgr.acquire();

//Search for the document based on some user id
Term idTerm = new Term(USER_ID, Integer.toString(userId));
Query idTermQuery = new TermQuery(term);
TopDocs result = searcher.search(idTermQuery, 1);
if (result.totalHits > 0) resultDoc = searcher.doc(result.scoreDocs[0].doc);
else resultDoc = null;

问题是resultDoc将始终为null。我错过了什么？我不应该使用commit()或flush()来查看这些更改。

我使用NRTManagerReopenThread作为示例here。

LE userDoc creation

public static Document getDocument(User user) {
    Document doc = new Document();
    FieldType storedType = new FieldType();
    storedType.setStored(true);
    storedType.setIndexed(false);

    // Store user data
    doc.add(new Field(USER_ID, user.getId().toString(), storedType));
    doc.add(new Field(USER_NAME, user.getFirstName() + user.getLastName(), storedType));

    FieldType unstoredType = new FieldType();
    unstoredType.setStored(false);
    unstoredType.setIndexed(true);
    Field field = null;

    // Analyze Location
    String tokens = "";
    if (user.getLocation() != null && ! user.getLocation().isEmpty()){
        for (Tag location : user.getLocation()) tokens += location.getName() + " ";

        field = new Field(USER_LOCATION, tokens, unstoredType);
        field.setBoost(Constants.LOCATION);
        doc.add(field);
    }

    // Analyze Language
    if (user.getLanguage() != null && ! user.getLanguage().isEmpty()){
        // Same as Location
}

    // Analyze Career
    if (user.getCareer() != null && ! user.getCareer().isEmpty()){
        // Same as Location
    }
    return doc;
}

Answer 1

您的问题与NRT无关。您正在再次搜索USER_ID字段，虽然它尚未编入索引，但这不起作用。如果您不希望对ID字段进行标记化，只需调用FieldType＃setTokenized（false）（或者只使用StringField，默认情况下完全执行此操作：由非标记化索引）。

Lucene 4.0 API - NRTManager简单用例

1 个答案: