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https://issues.apache.org/jira/browse/TINKERPOP-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17684316#comment-17684316
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ASF GitHub Bot commented on TINKERPOP-2837:
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ministat opened a new pull request, #1908:
URL: https://github.com/apache/tinkerpop/pull/1908
The current annotations object created by Collections.synchronizedMap() will
be shared across multiple threads, and some methods which access this object do
not apply lock (synchronized), as a result, NPE occurs. This patch fixed this
issue.
> Thread-safe problem when using Collections.synchronizedMap in ImmutableMetrics
> ------------------------------------------------------------------------------
>
> Key: TINKERPOP-2837
> URL: https://issues.apache.org/jira/browse/TINKERPOP-2837
> Project: TinkerPop
> Issue Type: Bug
> Components: language
> Affects Versions: 3.5.4
> Reporter: Redriver
> Priority: Major
>
> When I run the profile() in SparkGraphComputer, I got NPE:
>
> g.V().hasLabel('Account').has('Source', 10).has('AccountId',
> '1000017194').as('sourceAccount').match(
> __.as('sourceAccount').outE().inV().hasLabel('phone').as('node1'),
> __.as('sourceAccount').outE().inV().hasLabel('name').as('node2'),
> __.as('node1').inE().outV().hasLabel('Account').as('targetAccount'),
> __.as('targetAccount').outE().inV().as('node2'), where('targetAccount',
> neq('sourceAccount'))).select('targetAccount').valueMap().profile(）
>
> 22/12/07 02:21:00.980 dag-scheduler-event-loop ERROR DAGScheduler: Failed to
> update accumulator 17 (org.apache.spark.util.LegacyAccumulatorWrapper) for
> task 188
> java.lang.NullPointerException
> at
> java.util.Collections$SynchronizedMap.entrySet(Collections.java:2613)
> at
> org.apache.tinkerpop.gremlin.process.traversal.util.MutableMetrics.aggregate(MutableMetrics.java:139)
> at
> org.apache.tinkerpop.gremlin.process.traversal.step.util.ProfileStep$ProfileBiOperator.apply(ProfileStep.java:136)
> at
> org.apache.tinkerpop.gremlin.process.traversal.step.util.ProfileStep$ProfileBiOperator.apply(ProfileStep.java:130)
> at
> org.apache.tinkerpop.gremlin.spark.process.computer.MemoryAccumulator.addAccumulator(MemoryAccumulator.java:43)
> at
> org.apache.tinkerpop.gremlin.spark.process.computer.MemoryAccumulator.addInPlace(MemoryAccumulator.java:48)
> at
> org.apache.tinkerpop.gremlin.spark.process.computer.MemoryAccumulator.addInPlace(MemoryAccumulator.java:29)
> at
> org.apache.spark.util.LegacyAccumulatorWrapper.merge(AccumulatorV2.scala:512)
> at
> org.apache.spark.scheduler.DAGScheduler$$anonfun$updateAccumulators$1.apply(DAGScheduler.scala:1255)
> at
> org.apache.spark.scheduler.DAGScheduler$$anonfun$updateAccumulators$1.apply(DAGScheduler.scala:1246)
> at
> scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
> at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
> at
> org.apache.spark.scheduler.DAGScheduler.updateAccumulators(DAGScheduler.scala:1246)
> at
> org.apache.spark.scheduler.DAGScheduler.handleTaskCompletion(DAGScheduler.scala:1341)
> at
> org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.doOnReceive(DAGScheduler.scala:2105)
> at
> org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:2057)
> at
> org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:2046)
> at org.apache.spark.util.EventLoop$$anon$1.run(EventLoop.scala:49)
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