Question

I’m literally struggling with this new API and the lack of examples for core things like the NRT Manager.

I followed this example and here is the final result:

This is how the NRT Manager is built:

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);

Adding a new element to the NRT Manager’s writer:

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

After some small amount of time I need to update the previous document:

// 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;

The problem is that resultDoc will always be null. What am I missing? I should not use commit() or flush() in orther to see those changes.

I am using a NRTManagerReopenThread as exemplified 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

Your problem is not NRT-related. You are searching agains the USER_ID field although it has not been indexed, this can’t work. If you don’t want your ID field to be tokenized, just call FieldType#setTokenized(false) (or just use StringField, which does exactly that by default: indexed by not tokenized).