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DataFlow with Stream dataset gets stuck at pending activation



realtime dataflow has a Stream dataset as the primary source. The dataflow fails to start and is in the Pending-Activation status after to reactivating or restarting the flow. This occurs on skimming the ruleset with the Stream dataset to a higher major/minor version of the ruleset.

Error Messages

Caused by: 
java.util.concurrent.ExecutionException: com.pega.dsm.dnode.api.DNodeException: There's more than one instance for dataset CC_QUEUE
    at java.util.concurrent.FutureTask.get(
    at com.pega.dsm.dnode.impl.server.StreamDataSetRepository$1.load(
    ... 71 more
Caused by: 
com.pega.dsm.dnode.api.DNodeException: There's more than one instance for dataset CC_QUEUE
    at com.pega.dsm.dnode.impl.server.StreamDataSetRepository$GetDataSetTask.isValid(
    at com.pega.dsm.dnode.impl.server.StreamDataSetRepository$
    at com.pega.dsm.dnode.impl.server.StreamDataSetRepository$
    at java.util.concurrent.ThreadPoolExecutor.runWorker(
    at java.util.concurrent.ThreadPoolExecutor$
    at com.pega.dsm.dnode.util.PrpcRunnable$
    at com.pega.dsm.dnode.util.PrpcRunnable$
    at com.pega.dsm.dnode.util.PrpcRunnable.execute(
    at com.pega.dsm.dnode.impl.prpc.PrpcThreadFactory$

Steps to Reproduce

  1. Log in to Designer Studio.
  2. Create a dataflow with Stream dataset as the source.
  3. Navigate to the dataflow run landing page.
  4. Create a realtime dataflow run.
  5. Activate the dataflow run. The dataflow goes to the Active status and continues to run.
  6. Navigate to Designer Studio > System > Refactor > Rulesets.
  7. Skim the ruleset that has the Stream dataset to a higher major/minor version.
  8. Restart the Application Server instance after skimming is complete.
  9. Reactivate or restart the realtime dataflow run. The run status stays in the Pending-Activation state.

Root Cause

A defect in Pegasystems’ code or rules.
According to the design, Pega can have one version of a Stream dataset instance in the system.


Perform the below steps:
  1. Delete the duplicate version of the Stream dataset rule instance.
  2. Resave the Stream dataset instance version that must be retained in the system.
  3. Navigate to the System Management Application (SMA) > Advanced > Rule Cache Management.
  4. Delete the instance of the rule.
  5. Restart the Application Server.
  6. Open the Stream dataset rule instance and perform any operation such as browse, to initialize the Stream dataset.

Published February 22, 2019 - Updated October 8, 2020

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