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  • >> Go to dataminer.services

DB Sync failing on Active agent in failover pair.

Solved1.36K views5th July 2023db sync external cassandra node
0
Curtis Baiden [DevOps Advocate]506 10th May 2023 2 Comments

I am building 1+1 Dataminer system and have connected Cassandra hosted on a Linux server within the network. Dataminer can connect to this dbserver but only shows that it is synchronised to the offline dma agent and unsynchronised to the online agent.

Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 5th July 2023
Arunkrishna Shreeder [SLC] [DevOps Advocate] commented 11th May 2023

Hi Curtis, what do you see when you type nodetool status on the online agent via cmd in the path C:Program FilesCassandrabin ?
Also, you can open the file “C:Skyline DataMinerLoggingSLDBConnection.txt” on the online agent and see if it has any errors.

Curtis Baiden [DevOps Advocate] commented 11th May 2023

Hello Arunkrishna,
This is the result of the nodetool status :
C:Program FilesCassandrabin>nodetool status
The JAVA_HOME environment variable must be set to run this program!
Press any key to continue . . .

C:Program FilesCassandrabin>

—————-
This is also a snippet of the SLDBConnection.txt file :

at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at Cassandra.Requests.RequestExecution.d__13.MoveNext() Cassandra.InvalidQueryException: Keyspace ‘SLDMADB’ does not exist
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at Cassandra.Connection.d__88.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at Cassandra.Connection.d__88.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Cassandra.Requests.RequestHandler.d__41.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at Cassandra.Requests.RequestExecution.d__13.MoveNext()
— End of inner exception stack trace —
at SLCassandraClassLibrary.DBGateway.ExceptionHandlers.ExceptionHandler.handle(DBGatewayException exception)
at SLCassandraClassLibrary.DBGateway.Cassandra.StorageManagers.SingleNode.CassandraConnection.c__DisplayClass204_0.b__0(Task`1 c)
**********

3 Answers

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Danielle Falcone [SLC] [DevOps Advocate]1.44K Posted 12th May 2023 1 Comment

Hi,

normally cassandra cluster will have more than 1 node, so a synchronization will happen.

On test environments, you can have only one node, but on this way you will always have this sync error because there is nothing to be syncronized

Curtis Baiden [DevOps Advocate] Posted new comment 12th May 2023
Curtis Baiden [DevOps Advocate] commented 12th May 2023

Thank you for your help and clarification

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