alirezazamani opened a new issue #738: ConcurrentModificationException for the TaskGarbageCollectionStage URL: https://github.com/apache/helix/issues/738 In the async TaskGarbageCollectionStage, since the workflow context can be changes in other threads (main pipeline), while looping through all of the contexts we might get the exception below: 377558 [TaskJobPurgeWorker-CLUSTER_TestTaskRebalancerParallel] ERROR org.apache.helix.controller.pipeline.AbstractAsyncBaseStage - Failed to process TASK::TaskGarbageCollectionStage asynchronously java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1442) at java.util.HashMap$EntryIterator.next(HashMap.java:1476) at java.util.HashMap$EntryIterator.next(HashMap.java:1474) at org.apache.helix.task.TaskUtil.workflowGarbageCollection(TaskUtil.java:1054) at org.apache.helix.controller.stages.TaskGarbageCollectionStage.execute(TaskGarbageCollectionStage.java:55) at org.apache.helix.controller.pipeline.AbstractAsyncBaseStage$1.run(AbstractAsyncBaseStage.java:47) at org.apache.helix.controller.GenericHelixController$3.handleEvent(GenericHelixController.java:605) at org.apache.helix.controller.GenericHelixController$3.handleEvent(GenericHelixController.java:601) at org.apache.helix.common.DedupEventProcessor.run(DedupEventProcessor.java:42)
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