Hi Everyone,

Currently, we are getting the below exception in pega logs of our SIT environment.I appreciate, any suggestion to resolve the issue.

9,639 ERROR [stderr] (ADM_Pulse_Executor_54) Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (no host was tried) 19:39:59,639 ERROR [stderr] (ADM_Pulse_Executor_54)     at com.datastax.driver.core.RequestHandler.reportNoMoreHosts(RequestHandler.java:211) 19:39:59,639 ERROR [stderr] (ADM_Pulse_Executor_54)     at com.datastax.driver.core.RequestHandler.access$1000(RequestHandler.java:46) 19:39:59,639 ERROR [stderr] (ADM_Pulse_Executor_54)     at com.datastax.driver.core.RequestHandler$SpeculativeExecution.findNextHostAndQuery(RequestHandler.java:275) 19:39:59,639 ERROR [stderr] (ADM_Pulse_Executor_54)     at com.datastax.driver.core.RequestHandler.startNewExecution(RequestHandler.java:115) 19:39:59,639 ERROR [stderr] (ADM_Pulse_Executor_54)     at com.datastax.driver.core.RequestHandler.sendRequest(RequestHandler.java:95) 19:39:59,639 ERROR [stderr] (ADM_Pulse_Executor_54)     at com.datastax.driver.core.SessionManager.executeAsync(SessionManager.java:132) 19:39:59,639 ERROR [stderr] (ADM_Pulse_Executor_54)     ... 14 more 19:40:05,241 ERROR [com.datastax.driver.core.ControlConnection] (cluster9-reconnection-1) [Control connection] Cannot connect to any host, scheduling retry in 30000 milliseconds 19:40:12,777 ERROR [com.pega.dsm.dnode.api.SystemAuthReplicationFactorUpdater] (DDS.Default-Pulse:113) Exception thrown while updating system_auth replication factor: com.pega.dsm.dnode.impl.cassandra.CassandraManagementException: Unable to retrieve all node list from Cassandra JMX         at com.pega.dsm.dnode.impl.cassandra.CassandraManagement.getAllNodes(CassandraManagement.java:368)         at com.pega.dsm.dnode.api.SystemAuthReplicationFactorUpdater.getNumberOfNodes(SystemAuthReplicationFactorUpdater.java:59)         at com.pega.dsm.dnode.api.SystemAuthReplicationFactorUpdater.run(SystemAuthReplicationFactorUpdater.java:38)         at com.pega.dsm.dnode.api.RecurringOperationInvoker.invokeIfNeeded(RecurringOperationInvoker.java:30)         at com.pega.dsm.dnode.api.DdsService$DDSPulseOperation.lambda$pulse$0(DdsService.java:683)         at com.pega.dsm.dnode.impl.stream.DataObservableImpl$SafeDataSubscriber.subscribe(DataObservableImpl.java:338)         at com.pega.dsm.dnode.impl.stream.DataObservableImpl.subscribe(DataObservableImpl.java:40)         at com.pega.dsm.dnode.impl.stream.DataObservableImpl.await(DataObservableImpl.java:102)         at com.pega.dsm.dnode.impl.stream.DataObservableImpl.await(DataObservableImpl.java:91)         at com.pega.dsm.dnode.impl.prpc.service.health.ServiceHealthCheckRegistration$1.run(ServiceHealthCheckRegistration.java:106)         at com.pega.dsm.dnode.impl.prpc.service.health.ServiceHealthCheckRegistration$1.run(ServiceHealthCheckRegistration.java:97)         at com.pega.dsm.dnode.util.PrpcRunnable.execute(PrpcRunnable.java:52)         at com.pega.dsm.dnode.impl.prpc.service.ServiceHelper.executeInPrpcContextInternal(ServiceHelper.java:259)         at com.pega.dsm.dnode.impl.prpc.service.ServiceHelper.executeInPrpcContext(ServiceHelper.java:108)         at com.pega.dsm.dnode.impl.prpc.service.health.ServiceHealthCheckRegistration.lambda$registerPulseExecutor$0(ServiceHealthCheckRegistration.java:97)         at com.google.common.util.concurrent.MoreExecutors$ScheduledListeningDecorator$NeverSuccessfulListenableFutureTask.run(MoreExecutors.java:656)         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)         at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)         at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)         at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)         at com.pega.dsm.dnode.util.PrpcRunnable$1.run(PrpcRu

Thanks in Advance Ronali