java - Elasticsearch Java API模糊搜索测试

Question

我在使用 native elasticsearch java api 时遇到问题。我想创建一个方法来通过名称属性搜索对象。到目前为止很简单，之后我想为此方法创建一个 JUnit 测试，然后问题就开始了。

    @Test
public void nameSearchTest() throws ElasticSearchUnavailableException, IOException{
    String nameToSearch = "fuzzyText";
    TrainingToCreate t = new TrainingToCreate();
    t.setName(nameToSearch);
    //Create two Trainings to find sth
    String id1 = ElasticIndexer.index(t);
    String id2 = ElasticIndexer.index(t);
    //For creating delay, throws Exception if id doesn't exist
    ElasticGetter.getTrainingById(id1);
    ElasticGetter.getTrainingById(id2);

    int hits = 0;
    ArrayList<Training> trainings = ElasticSearch.fuzzySearchTrainingByName(nameToSearch, Integer.MAX_VALUE, 0);
    System.out.println("First id: " + id1);
    System.out.println("Second id: " + id2);
    String idOfTraining;
    if(trainings.size() == 0){
        System.out.println("Zero hits could be found.");
    }
    //just for printing id's of results
    //-------------------------------------------------
    for (int i = 0; i < trainings.size(); i++) {
        idOfTraining = trainings.get(i).getId();
        System.out.println("Training: "+i+" id: "+ idOfTraining);
    }
    //-------------------------------------------------
    for (Training training : trainings) {
        if(training.getId().equals(id1)||training.getId().equals(id2)){
            hits++;
        }
    }
    assertTrue(hits>=2);
    ElasticDelete.deleteTrainingById(id1);
    ElasticDelete.deleteTrainingById(id2);
}

有时这个测试工作没有问题，有时搜索结果不包含任何内容，即使我创建了一些文档以确保可以找到某些内容。但是如果我查看elasticsearch的数据库，文档是存在的，所以我猜我的实现不正确，或者搜索api有严重的延迟。

这里是正在测试的代码:

public static ArrayList<Training> fuzzySearchTrainingByName(String name, int size, int offset) throws ElasticSearchUnavailableException, JsonParseException, JsonMappingException, IOException {
    Client client = clientFactory.getClient(configService.getConfig().getElasticSearchIp(), configService
            .getConfig().getElasticSearchPort());
    return ElasticSearch.fuzzySearchDocument(client, "trainings", "training", "name", name, size, offset);
}

private static ArrayList<Training> fuzzySearchDocument(Client client, String index, String type, String field, String value, int size, int offset) throws JsonParseException, JsonMappingException, IOException {
    QueryBuilder query = fuzzyQuery(field, value);

    SearchResponse response = client.prepareSearch(index).setTypes(type)
            .setQuery(query).setSize(size).setFrom(offset).execute().actionGet();

    SearchHits hits = response.getHits();

    TrainingToCreate source = null;
    ObjectMapper mapper = new ObjectMapper();
    ArrayList<Training> trainings = new ArrayList<Training>();

    for (SearchHit searchHit : hits) {
        source = mapper.readValue(searchHit.getSourceAsString(), TrainingToCreate.class);
        trainings.add(TrainingFactory.getTraining(searchHit.getId(), source));
    }
    return trainings;

}

我正在使用 Elastic 1.7.0 进行 Java 8 工作有人重新认识到问题的位置吗？如果有人需要更多信息，请随时询问。

Answer 1

Elasticsearch 是 near real time ，这意味着在您索引文档的时刻和可搜索文档的时刻之间存在一些延迟(默认为 1 秒)。您可以通过在运行查询之前刷新索引来克服这个问题。

所以我会在您索引示例文档后立即执行此操作...

public void nameSearchTest() throws ElasticSearchUnavailableException, IOException{
    String nameToSearch = "fuzzyText";
    TrainingToCreate t = new TrainingToCreate();
    t.setName(nameToSearch);
    //Create two Trainings to find sth
    String id1 = ElasticIndexer.index(t);
    String id2 = ElasticIndexer.index(t);

    // REFRESH YOUR INDICES (just after indexing)
    client().admin().indices().prepareRefresh().execute().actionGet();

...或者就在 fuzzySearchDocument

的开头

 private static ArrayList<Training> fuzzySearchDocument(Client client, String index, String type, String field, String value, int size, int offset) throws JsonParseException, JsonMappingException, IOException {
     // REFRESH YOUR INDICES (just before searching)
     client().admin().indices().prepareRefresh().execute().actionGet();

     QueryBuilder query = fuzzyQuery(field, value);
     ...

如果您对示例文档运行多个测试用例，我会选择第一个选项，否则任何选项都可以。