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https://issues.apache.org/jira/browse/TINKERPOP-1923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16397105#comment-16397105
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James Baker edited comment on TINKERPOP-1923 at 3/13/18 3:33 PM:
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Looking in the logs, it seems to be printing the "Removing original vertices"
message twice (it shouldn't, there is nothing in the code that should cause
that to happen) - so that could be some strange compiler bug. Presumably if the
log message is being called twice, the drop command could be called twice too.
If the Gremlin query was called twice, would you expect to see the error above?
was (Author: james.d.baker):
So this might be a combination of a Java 9 and TinkerGraph problem. If I
compile with Java 8, it seems more robust.
Looking in the logs, it seems to be printing the "Removing original vertices"
message twice (it shouldn't, there is nothing in the code that should cause
that to happen) - so that could be some strange Java 9 compiler bug. Presumably
if the log message is being called twice, the drop command could be called
twice too.
If the Gremlin query was called twice, would you expect to see the error above?
> Intermittent NegativeArraySizeException on drop
> -----------------------------------------------
>
> Key: TINKERPOP-1923
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1923
> Project: TinkerPop
> Issue Type: Bug
> Components: tinkergraph
> Affects Versions: 3.3.1
> Reporter: James Baker
> Priority: Major
>
> I am intermittently getting the following exception when dropping vertices on
> a TinkerGraph:
> {noformat}
> Exception in thread "main" java.lang.NegativeArraySizeException
> at java.util.AbstractCollection.toArray(AbstractCollection.java:136)
> at java.util.ArrayList.addAll(ArrayList.java:581)
> at java.util.HashMap$Values.forEach(HashMap.java:981)
> at
> org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerHelper.getEdges(TinkerHelper.java:172)
> at
> org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerVertex.edges(TinkerVertex.java:146)
> at
> org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerVertex.remove(TinkerVertex.java:131)
> at
> org.apache.tinkerpop.gremlin.process.traversal.step.filter.DropStep.filter(DropStep.java:67)
> at
> org.apache.tinkerpop.gremlin.process.traversal.step.filter.FilterStep.processNextStart(FilterStep.java:38)
> at
> org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:143)
> at
> org.apache.tinkerpop.gremlin.process.traversal.step.util.ExpandableStepIterator.next(ExpandableStepIterator.java:50)
> at
> org.apache.tinkerpop.gremlin.process.traversal.step.filter.FilterStep.processNextStart(FilterStep.java:37)
> at
> org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:128)
> at
> org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:38)
> at
> org.apache.tinkerpop.gremlin.process.traversal.Traversal.iterate(Traversal.java:203)
> at
> org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal.iterate(GraphTraversal.java:2664)
> at
> org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal$Admin.iterate(GraphTraversal.java:177)
> at
> org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.DefaultGraphTraversal.iterate(DefaultGraphTraversal.java:48)
> at mycode.merge.GraphMerger.mergeVertices(GraphMerger.java:172)
> at mycode.merge.GraphMerger.lambda$mergeGraphs$6(GraphMerger.java:78)
> at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
> at
> java.util.concurrent.ConcurrentHashMap$ValueSpliterator.forEachRemaining(ConcurrentHashMap.java:3566)
> at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
> at
> java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
> at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
> at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
> at mycode.merge.GraphMerger.mergeGraphs(GraphMerger.java:79)
> at mycode.cli.mapper.MergeGraphFiles.main(MergeGraphFiles.java:117)
> {noformat}
> My code is as follows (the last line is Line 172, which is where the
> exception is thrown):
> {code:java}
> LOGGER.info("Removing original vertices");
> Object[] ids = mergeGroup.stream().map(Element::id).toArray();
> LOGGER.debug("IDs to remove {}", ids);
> if(ids != null && ids.length > 0)
> graph.traversal().V(ids).drop().iterate();
> {code}
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