使用Janusgraph（Java内存实现），如何在创建索引之前提交属性键？

Question

我正在使用 Janusgraph 制作一个 Java 项目原型，但遇到了问题。如果我创建属性键并在创建索引之前提交该属性键，则索引似乎停留在 INSTALLED 状态。示例代码在这里：

    @Test
    public void minimalTest() throws InterruptedException {
        // build in-memory backend for janusgraph
        JanusGraph graph = JanusGraphFactory.build().set("storage.backend", "inmemory").open();
        graph.tx().rollback();
        JanusGraphManagement mgmt = graph.openManagement();
        // create test prop & commit
        String testProp = "testprop";
        mgmt.getOrCreatePropertyKey(testProp);
        mgmt.commit();
        // create test index & commit
        mgmt = graph.openManagement();
        String testIndex = "testIndex";
        mgmt.buildIndex(testIndex, Vertex.class).addKey(mgmt.getPropertyKey(testProp)).buildCompositeIndex();
        mgmt.commit();
        // attempt to wait for enabled
        ManagementSystem.awaitGraphIndexStatus(graph, testIndex).status(SchemaStatus.ENABLED).call();
        System.out.println("Gets stuck in the await line above and never makes it here");
    }

如果我注释掉提交属性密钥并重新打开图形管理，那么此代码可以正常工作。例子在这里：

    @Test
    public void minimalTest() throws InterruptedException {
        // build in-memory backend for janusgraph
        JanusGraph graph = JanusGraphFactory.build().set("storage.backend", "inmemory").open();
        graph.tx().rollback();
        JanusGraphManagement mgmt = graph.openManagement();
        // create test prop & commit
        String testProp = "testprop";
        mgmt.getOrCreatePropertyKey(testProp);
        //mgmt.commit();
        // create test index & commit
        //mgmt = graph.openManagement();
        String testIndex = "testIndex";
        mgmt.buildIndex(testIndex, Vertex.class).addKey(mgmt.getPropertyKey(testProp)).buildCompositeIndex();
        mgmt.commit();
        // attempt to wait for enabled
        ManagementSystem.awaitGraphIndexStatus(graph, testIndex).status(SchemaStatus.ENABLED).call();
        System.out.println("Gets here fine");
    }

我需要做什么才能让我在与索引不同的事务中创建属性键，就像上面的第一个示例一样？

我的 janusgraph-core 和 janusgraph-inmemory 版本是 1.0.0（如果这很重要的话）。谢谢！

Answer 1

事实证明我必须：

1. 将发生回滚的时间更改为在提交 propertyKey 后运行
2. 添加索引后执行架构操作以启用索引。

最终的工作代码如下所示：

@Test
public void minimalTest4() throws InterruptedException, ExecutionException {
    // build in-memory backend for janusgraph
    JanusGraph graph = JanusGraphFactory.build().set("storage.backend", "inmemory").open();
    JanusGraphManagement mgmt = graph.openManagement();
    // create test prop & commit
    String testProp = "testprop";
    mgmt.getOrCreatePropertyKey(testProp);
    mgmt.commit();
    graph.tx().rollback();
    // create test index & commit
    mgmt = graph.openManagement();
    String testIndex = "testIndex";
    mgmt.buildIndex(testIndex, Vertex.class).addKey(mgmt.getPropertyKey(testProp)).buildCompositeIndex();
    mgmt.commit();
    ManagementSystem.awaitGraphIndexStatus(graph, testIndex).status(SchemaStatus.REGISTERED).call();
    // enable index
    mgmt = graph.openManagement();
    mgmt.updateIndex(mgmt.getGraphIndex(testIndex), SchemaAction.ENABLE_INDEX).get();
    mgmt.commit();
    // attempt to wait for enabled
    ManagementSystem.awaitGraphIndexStatus(graph, testIndex).status(SchemaStatus.ENABLED).call();
    System.out.println("Gets here fine");
}