带有Amazon DynamoDB后端的Titan上的索引状态永远不会更改为ENABLED [英] Index state never change to ENABLED on Titan with Amazon DynamoDB backend

问题描述

我正在尝试在DynamoDB上使用复合索引，并且索引从不从已安装切换到已注册状态。

I'm trying to use composite index on DynamoDB and the index never switches from from INSTALLED to REGISTERED state.

这是我用来创建它的代码

Here is the code I used to create it

        graph.tx().rollback(); //Never create new indexes while a transaction is active
        TitanManagement mgmt=graph.openManagement();
        PropertyKey propertyKey=getOrCreateIfNotExist(mgmt, "propertyKeyName");
        String indexName = makePropertyKeyIndexName(propertyKey);

        if (mgmt.getGraphIndex(indexName)==null) {
            mgmt.buildIndex(indexName, Vertex.class).addKey(propertyKey).buildCompositeIndex();
            mgmt.commit();
            graph.tx().commit();
            ManagementSystem.awaitGraphIndexStatus(graph, indexName).status(SchemaStatus.REGISTERED).call(); 
        }else {
            mgmt.rollback();
        }

日志示例为：

...
...

... ...

612775 [main]信息
com.thinkaurelius .titan.graphdb.database.management.GraphIndexStatusWatcher
-索引myIndex上的某些键当前未注册：type = INSTALLED 613275 [main] INFO
com.thinkaurelius.titan.graphdb。 database.management.GraphIndexStatusWatcher
-索引typeIndex上的某些键当前未处于注册状态：type = INSTALLED 613275 [main] INFO
com.thinkaurelius.titan.graphdb.database.management.GraphIndexStatusWatcher
-等待索引typeIndex收敛于已注册状态时超时（PT1M）

612775 [main] INFO com.thinkaurelius.titan.graphdb.database.management.GraphIndexStatusWatcher - Some key(s) on index myIndex do not currently have status REGISTERED: type=INSTALLED 613275 [main] INFO com.thinkaurelius.titan.graphdb.database.management.GraphIndexStatusWatcher - Some key(s) on index typeIndex do not currently have status REGISTERED: type=INSTALLED 613275 [main] INFO com.thinkaurelius.titan.graphdb.database.management.GraphIndexStatusWatcher - Timed out (PT1M) while waiting for index typeIndex to converge on status REGISTERED

推荐答案

等待更长的时间就可以了。示例：

Waiting for a longer time does the trick. Example:

ManagementSystem.awaitGraphIndexStatus(graph, propertyKeyIndexName)
                    .status(SchemaStatus.ENABLED)
                    .timeout(10, ChronoUnit.MINUTES) // set timeout to 10 min
                    .call();

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