This bug (BUG-559949) identified in Pega 8.3 version. The underlying problem in this issue is coming from Kafka Client https://issues.apache.org/jira/browse/KAFKA-7082 which was fixed in Pega 8.3.3 release. to fix this issue apply the latest Pega 8.3.4 patchset in your environment, meanwhile
1. Go to Dev Studio > Records > Sysadmin > Log Category and create a new log category rule instance.
2. Provide a short description and log category name such as "DataflowResilienceStrategy.default". Log category name is just ID of the rule instance. After clicking on create provide the default log level for the logger "com.pega.dsm.dnode.impl.dataflow.resilience.AtLeastOnceResilienceStrategy" and set it to OFF instead of current level "ERROR". This should eliminate the ERROR you are seeing.