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Support Article

Cassandra is not started or is unavailable

SA-98572

Summary



Exceptions occur in the 'Data-Decision-ADM-ModelSnapshot.pzGetAllModelDetails' Batch activity.


Error Messages



[fault (self-tuning)'] [STANDARD] [PegaRULES:8] (internal.mgmt.Executable) ERROR   - Exception
com.pega.decision.adm.client.ADMException: Failed to complete ADM Data Mart snapshot

Caused by: com.pega.decision.adm.client.ADMException: java.lang.IllegalStateException: Unable to obtain session. Cassandra hasn't been started or is unavailable

...
[fault (self-tuning)'] [STANDARD] [PegaRULES:8] (ernal.async.BatchRequestorTask) ERROR   - Batch activity "Data-Decision-ADM-ModelSnapshot.pzGetAllModelDetails" threw:
com.pega.pegarules.pub.PRRuntimeException: unable to execute agent: Pega-DecisionEngine #0: Data-Decision-ADM-ModelSnapshot.pzGetAllModelDetailsJava Exception:     com.pega.decision.adm.client.ADMException: Failed to complete ADM Data Mart snapshot
    at com.pega.pegarules.session.internal.async.agent.QueueProcessor.execute(QueueProcessor.java:719) ~[prprivate-session.jar:?]
...
[fault (self-tuning)'] [STANDARD] [PegaRULES:8] (internal.async.AgentQueue) ERROR   - Agent Pega-DecisionEngine #0: Data-Decision-ADM-ModelSnapshot.pzGetAllModelDetails encountered an execution error. Restarting after delay.
com.pega.pegarules.pub.PRRuntimeException: unable to execute agent: Pega-DecisionEngine #0: Data-Decision-ADM-ModelSnapshot.pzGetAllModelDetailsJava Exception:     com.pega.decision.adm.client.ADMException: Failed to complete ADM Data Mart snapshot
    at com.pega.pegarules.session.internal.async.agent.QueueProcessor.execute(QueueProcessor.java:719) ~[prprivate-session.jar:?]
...
[fault (self-tuning)'] [STANDARD] [PegaRULES:8] (internal.async.AgentQueue) ERROR   - Problem queue Pega-DecisionEngine #0: Data-Decision-ADM-ModelSnapshot.pzGetAllModelDetails will restart at



STEPS TO REPR ODUCE

Install Pega Platform 8.3.1.


Root Cause



The ADMSnapshot agent is enabled by default in Pega Platform 8.3.1.


Resolution



Perform either of the following local-changes:
  • Upgrade to Pega Platform 8.3.2 or Pega Platform 8.4.
  • If -DNodeType=Universal is used, modify it to DNodeType=BackgroundProcessing,Search,Stream,WebUser,DDS. Else, add the the Decision Data Store (DDS) argument to the main node.
  • Manually disable the ADMSnapshot agent in Pega 8.3.1.
Suggest Edit

Published December 2, 2021

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