Support Article
Stale threads display on Data Flow nodes sporadically
Summary
Stale threads display on Data Flow nodes sporadically while using Pega 8.2.4 on Pega Cloud environment.
Error Messages
com.pega.dsm.dnode.impl.dataflow.DataFlowStaleThreadException: Stale thread detected: Thread[DataFlow-Service-PickingupRun-DF-9903:150, Access group: [TestApp:Administrators], Partitions=[12],5,DataFlow-Service-PickingupRun-DF-9903]
at com.pega.decision.strategy.ssa.runtime.Lib.wrap(Lib.java:95)
at com.pega.decision.strategy.ssa.runtime.Lib.group(Lib.java:558)
at com.pega.decision.strategy.ssa.SSAInterpreter.visit(SSAInterpreter.java:389)
at com.pega.decision.strategy.ssa.SSAVisitor.visit(SSAVisitor.java:85)
at com.pega.decision.strategy.ssa.SSAInterpreter.evaluateSSA(SSAInterpreter.java:817)
at com.pega.decision.strategy.ssa.SSAInterpreter.visit(SSAInterpreter.java:633)
at com.pega.decision.strategy.ssa.SSAVisitor.visit(SSAVisitor.java:125)
at com.pega.decision.strategy.ssa.SSAInterpreter.evaluateSSA(SSAInterpreter.java:817)
at com.pega.decision.strategy.ssa.SSAInterpreter.visit(SSAInterpreter.java:298)
at com.pega.decision.strategy.ssa.SSAVisitor.visit(SSAVisitor.java:65)
at com.pega.decision.strategy.ssa.SSAInterpreter.evaluateSSA(SSAInterpreter.java:817)
at com.pega.decision.strategy.ssa.SSAInterpreter.visit(SSAInterpreter.java:633)
at com.pega.decision.strategy.ssa.SSAVisitor.visit(SSAVisitor.java:125)
at com.pega.decision.strategy.ssa.SSAInterpreter.evaluateSSA(SSAInterpreter.java:817)
at com.pega.decision.strategy.ssa.SSAInterpreter.evaluateSSAs(SSAInterpreter.java:808)
at com.pega.decision.strategy.ssa.SSAInterpreter.visit(SSAInterpreter.java:114)
at com.pega.decision.strategy.ssa.SSAVisitor.visit(SSAVisitor.java:33)
at com.pega.decision.strategy.ssa.SSAInterpreter.evaluateSSA(SSAInterpreter.java:817)
at com.pega.decision.strategy.ssa.SSAInterpreter.visit(SSAInterpreter.java:602)
at com.pega.decision.strategy.ssa.SSAVisitor.visit(SSAVisitor.java:117)
at com.pega.decision.strategy.ssa.SSAInterpreter.evaluateSSA(SSAInterpreter.java:817)
at com.pega.decision.strategy.ssa.vm.SSAVirtualMachine.execute(SSAVirtualMachine.java:145)
com.pegarules.generated.strategy.ra_action_generateunsubscriptionresponse_55c5d0af2cb0103939fe5f7c73b04c77.pzSsaVmPerform
Steps to Reproduce
Unknown
Root Cause
A defect in Pegasystems’ code or rules. The implicit locking made by the JVM during class initialization causes a Deadlock in the static block initialization.
Resolution
This issue is addressed in the following releases:
- Pega 8.1.8 patch release
- Pega 8.2.6 patch release
- Pega 8.3.2 patch release
- Pega platform 8.4
Contact Pega Global Customer Support for interim local solution.
Published April 3, 2020 - Updated December 2, 2021
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