After upgrade to 9.4 Hazelcast errors lifecycle appear in log could not initialize cluster

Products

• CA Mobile API Gateway
• CA Rapid App Security

Issue/Introduction

Upgrade to 9.4

After upgrade this error is observed in ssg_0_0.log

2020-09-19T10:54:12.270-0500 WARNING 1 com.l7tech.server.boot.GatewayMain: Error starting server : Lifecycle error: Could not initialize Hazelcast cluster

com.l7tech.server.LifecycleException: Lifecycle error: Could not initialize Hazelcast cluster

Environment

Release : 7.1

Component : MOBILE API

Resolution

Upgraded AND restart/reboot all nodes in the cluster so hazelcast is operating at the same version (internally) mismatch of versions 9.3 nodes in cluster with 9.4 restarted will cause exceptions and failures to start the gateway.