使用弹性搜索的Titan索引。字符串匹配问题

时间:2016-01-11 13:06:22

标签: elasticsearch titan tinkerpop3

我在使用Titan进行索引编制方面遇到了一些麻烦。我按如下方式配置索引:

TitanGraph graph = TitanFactory.open("conf/titan-cassandra-es.properties");
TitanManagement management = graph.openManagement();
String indexKey = "byItemIdentifier";
String propertyKey = "ITEM_IDENTIFIER";
TitanIndex index = management.getGraphIndex(indexKey);
PropertyKey key = management.makePropertyKey(propertyKey).dataType(String.class).make();
management.buildIndex(indexKey, Vertex.class).addKey(key, Mapping.STRING.asParameter()).buildMixedIndex("search");
management.commit();

现在出现问题:

Vertex vertex = graph.addVertex();
vertex.property(propertyKey, "www.foo.com/bar");
graph.commit();

然后我尝试以下方法:

graph.traversal().V().has(propertyKey, "foo").hasNext(); //(1)
graph.traversal().V().has(propertyKey, "bar").hasNext(); //(2)
graph.traversal().V().has(propertyKey, "www.foo.com/bar").hasNext(); //(3)

(1)= false (2)= false (3)= false < / strong>即可。这是怎么回事?当然(3)应该返回true?我错误配置了什么吗?

1 个答案:

答案 0 :(得分:0)

首先,在创建索引之后,您应该等待它从安装到注册。这种方法会有所帮助:

// Block until the SchemaStatus transitions from INSTALLED to REGISTERED
ManagementSystem.awaitGraphIndexStatus(graph, vertices_index).status(SchemaStatus.REGISTERED).call();

这将阻止您的代码,直到您的索引后端创建它。

其次,如果图中已经存在一些数据,则必须重新索引属性,以便索引后端(Elasticsearch等)可以识别它。使用此Java方法:

public static void reindexGraph(TitanGraph graph, String myIndex) throws InterruptedException {
    TitanManagement management = graph.openManagement();
    TitanGraphIndex index = management.getGraphIndex(myIndex);
    management.updateIndex(index, SchemaAction.REINDEX);
    management.commit();

    // Enable the index
    ManagementSystem.awaitGraphIndexStatus(graph, myIndex).status(SchemaStatus.ENABLED).call();
    graph.tx().commit();
}