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DNodeException occurs while processing headless SOAP requests



There is an error message 'DNodeException: Cannot execute modification statement' in a Pega 7.2 multi-node environment.

The error occurs as part of processing a headless SOAP request. The requesting client is affected.

Error Messages

com.pega.dsm.dnode.api.DNodeException: Cannot execute modification statement
at com.pega.dsm.dnode.impl.cassandra.CassandraDao.executeStatement(
at com.pega.dsm.dnode.impl.cassandra.CassandraDataRepository.insert(
at com.pega.dsm.dnode.impl.dataset.cassandra.CassandraSaveOperation$2.emit(
at com.pega.dsm.dnode.impl.dataflow.strategy.DelayedLearning.saveResultsForDelayedLearning(
at com.pega.dsm.dnode.impl.dataflow.strategy.StrategyStageProcessor.onNext(
... 98 more

HazelCase Logs - 

2016-05-03 11:58:40,668 [c-operation.thread-1] [                    ] [                    ] (zelcast.cluster.ClusterService) INFO    - [YourServerIPAddressOne]:5702 [141268a7c70f4f3c888d24752499eb74] [3.4.1] Master Address[YourServerIPAddressTwo]:5702 left the cluster. Assigning new master Member [YourServerIPAddressOne]:5702 this
2016-05-03 11:58:40,678 [c-operation.thread-1] [                    ] [                    ] (zelcast.cluster.ClusterService) INFO    - [YourServerIPAddressOne]:5702 [141268a7c70f4f3c888d24752499eb74] [3.4.1] Removing Member [YourServerIPAddressTwo]:5702
2016-05-03 11:58:40,681 [9eb74.IO.thread-in-0] [                    ] [                    ] (       nio.tcp.TcpIpConnection) INFO    - [YourServerIPAddressOne]:5702 [141268a7c70f4f3c888d24752499eb74] [3.4.1] Connection [Address[YourServerIPAddressTwo]:5702] lost. Reason:[Remote socket closed!]
2016-05-03 11:58:40,681 [9eb74.IO.thread-in-0] [                    ] [                    ] (           nio.tcp.ReadHandler) WARN    - [YourServerIPAddressOne]:5702 [141268a7c70f4f3c888d24752499eb74] [3.4.1] hz._hzInstance_2_141268a7c70f4f3c888d24752499eb74.IO.thread-in-0 Closing socket to endpoint Address[YourServerIPAddressTwo]:5702, Remote socket closed!
2016-05-03 11:58:40,687 [c-operation.thread-1] [                    ] [                    ] (zelcast.cluster.ClusterService) INFO    - [YourServerIPAddressOne]:5702 [141268a7c70f4f3c888d24752499eb74] [3.4.1] 

Steps to Reproduce

Not known

Root Cause

The nodes are decommissioned before being taken out of service.


Perform the following local change:

Change the D-Node topology to specify the minimum number of nodes needed. Typically, this number is 1 more than the number of replicates.

For more information, see the following PDN resources:
Pega 7.2 Help topic
Decision Strategy Manager 7.2 D-Node Operations Guide
Suggest Edit

Published July 22, 2016 - Updated October 8, 2020

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