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Servers fail with ClusterAvailabilityException

SA-62897

Summary



Servers fail with ClusterAvailabilityException.


Error Messages



Caused by: pega.decision.vbd.node.ClusterAvailabilityException: No cluster nodes available
at pega.decision.vbd.node.client.ServerNodeCache.getNext(ServerNodeCache.java:84)~[vbd-node-jar:?]
at pega.decision.vbd.node.client.DefaultClientClusterExecutor.execute(DefaultClientClusterExecutor.java:51) ~[vbd-node-jar:?]
at pega.decision.vbd.node.client.ClientEngine.insert(ClientEngine.java:64)~[vbd-node-jar:?]
at pega.decision.vbd.service.impl.VBDServiceImpl.insertFactRecords(VBDServiceImpl.java:158)~[vbd-impl-jar:?]
 


Steps to Reproduce



Unknown


Root Cause



The cluster crashes and the nodes stop communicating. Since the nodes do not receive signal from the other nodes (old node is terminated), they consider that they are broken and cast the members away.


Resolution



Here’s the explanation for the reported behavior: 
According to the architecture, the existing node is replaced by a new node if any of the following occurs:   
  • High resource utilization and the node enters the hung state
  • Application requires a longer time to open due to any activity
  • Abnormalities in the server

A JAR file which requires a server restart to reflect is imported. Error message displays after the server restart since the nodes are unavailable to form a cluster. However, the server is stable after it receives the heartbeat message from a new node.



 

Suggest Edit

Published October 8, 2020

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