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When I start "MongoDB Contacts to xConnect Migration" pipeline with 1 thread all works fine. But when start with more then 1. I have an error after random count of processed contacts.

24104 14:15:53 ERROR [Data Exchange] Collection was modified; enumeration operation may not execute. (pipeline: Read Contacts from MongoDB Pipeline, pipeline step: Iterate MongoDB Contacts and Run Pipelines, pipeline step identifier: 4d6400a4-4e78-4555-80d7-46aafd07afe9)
24104 14:15:53 ERROR [Data Exchange] at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
   at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
   at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
   at Sitecore.DataExchange.Processors.PipelineSteps.BasePipelineStepProcessor.GetMissingRequiredPlugin[T](IHasPlugins obj)
   at Sitecore.DataExchange.Processors.PipelineSteps.BasePipelineStepProcessor.AreRequiredPluginsSet()
   at Sitecore.DataExchange.Processors.PipelineSteps.BasePipelineStepProcessor.StartProcessing(PipelineStep pipelineStep, PipelineContext pipelineContext, ILogger logger)
   at Sitecore.DataExchange.Processors.Pipelines.PipelineProcessor.ProcessPipelineStep(PipelineStep pipelineStep, PipelineContext pipelineContext, ILogger logger)
   at Sitecore.DataExchange.Processors.Pipelines.PipelineProcessor.ProcessPipeline(Pipeline pipeline, PipelineContext pipelineContext, ILogger logger)
   at Sitecore.DataExchange.Processors.PipelineSteps.IterateAndRunPipelinesStepProcessor.ProcessPipelines(PipelineStep pipelineStep, ICollection`1 subPipelines, PipelineContext pipelineContext, ILogger logger)
   at Sitecore.DataExchange.Processors.PipelineSteps.IterateAndRunPipelinesStepProcessor.<>c__DisplayClass4_0.<IterateWithThreads>b__0(Object element, Int32 threadId)
   at Sitecore.DataExchange.Helpers.EnumeratorHandlerHelper.RunThread(IEnumerator data, Int32 threadId, EnumeratorHandlerHelperContext context)

Does someone know what i configured wrong?

  • Which pipeline step was used to set threads? – Vlad Shpak Mar 4 '19 at 22:30
  • @VladShpak this "Iterate MongoDB Contacts and Run Pipelines" – pblrok Mar 5 '19 at 8:39
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This issue is with the product itself, not related to the configuration.

BaseHasPlugins class is not a thread-safe. Basically, it holds the list of plugins associated with some pipeline-step (in this case).

When you are running it with multiple threads: while one thread is using the method public IPlugin GetPlugin(Type type) which enumerates over a list of internal plugins, another thread is trying to add/modify a new plugin.

Please contact Sitecore Support to resolve it.

Workaround: You can inherit the current pipeline step processor, and override

protected override bool AreRequiredPluginsSet() { return true; }

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