When indexed, throw Exception during add Vertex

user_10543451 0
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The index has built well;
No Exception Here, and the graphManagement has committed well;

graphManagement.buildIndex("uidIndex", Vertex.class). 
     addKey(graphManagement.getPropertyKey("uid_code")).
     buildCompositeIndex();

i have configured the query.force-index=true ；
But when I try to add some vertex, using the propertyKey 'uid_code', code is following: 

Vertex vertex = g.V().addV(label).
       property(propertyKey, propertyValue).
       next();

Exception throwed :

org.janusgraph.core.JanusGraphException: Could not find a suitable index to answer graph query and graph scans are disabled: [()]:VERTEX
    at org.janusgraph.graphdb.transaction.StandardJanusGraphTx$6.execute(StandardJanusGraphTx.java:1283)
    at org.janusgraph.graphdb.transaction.StandardJanusGraphTx$6.execute(StandardJanusGraphTx.java:1150)
    at org.janusgraph.graphdb.query.QueryProcessor$LimitAdjustingIterator.getNewIterator(QueryProcessor.java:209)
    at org.janusgraph.graphdb.query.LimitAdjustingIterator.hasNext(LimitAdjustingIterator.java:68)
    at com.google.common.collect.Iterators$7.computeNext(Iterators.java:650)
    at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
    at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
    at org.janusgraph.graphdb.query.ResultSetIterator.nextInternal(ResultSetIterator.java:54)
    at org.janusgraph.graphdb.query.ResultSetIterator.<init>(ResultSetIterator.java:44)
    at org.janusgraph.graphdb.query.QueryProcessor.iterator(QueryProcessor.java:68)
    at com.google.common.collect.Iterables$7.iterator(Iterables.java:613)
    at org.janusgraph.graphdb.tinkerpop.optimize.JanusGraphStep.lambda$new$0(JanusGraphStep.java:71)
    at org.apache.tinkerpop.gremlin.process.traversal.step.map.GraphStep.processNextStart(GraphStep.java:142)
    at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:143)
    at org.apache.tinkerpop.gremlin.process.traversal.step.util.ExpandableStepIterator.next(ExpandableStepIterator.java:50)
    at org.apache.tinkerpop.gremlin.process.traversal.step.map.MapStep.processNextStart(MapStep.java:36)
    at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:128)
    at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:38)
    at org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversal.next(DefaultTraversal.java:200)
    at dataTrans.KfkMsgParser.createMerge(KfkMsgParser.java:742)

Can someone tell me whether i forget something in document ?
Or
what i can do to fix this problem ?

janusgraph gremlin
2 Answers

To add a single vertex, you should invoke addV() directly on the traversal source g:

 String propertyKey = "uid_code";
 Vertex vertex = g.addV(label).
     property(propertyKey, propertyValue).
     next();

When you start the query with g.V().addV(label)..., the traversal attempts to scan all vertices with g.V() and thus the exception is thrown.

user_50251290

Your index should be enabled to be used.

graph.tx().rollback(); //Never create new indexes while a transaction is active
JanusGraphManagement graphManagement = graph.openManagement();
graphManagement.buildIndex("uidIndex", Vertex.class). 
     addKey(graphManagement.getPropertyKey("uid_code")).
     buildCompositeIndex();
graphManagement.commit();

//Wait for the index to become available
ManagementSystem.awaitGraphIndexStatus(graph, "uidIndex").call();

graphManagement = graph.openManagement();
// Use REINDEX to reindex old data and enable the index
// Use ENABLE to simply enable the index
graphManagement.updateIndex(graphManagement.getGraphIndex("uidIndex"), SchemaAction.REINDEX).get();
graphManagement.commit();

You can check index lifecycle here: https://github.com/JanusGraph/janusgraph/wiki/Indexing

Here is the index documentation: https://docs.janusgraph.org/latest/indexes.html

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