We have alams on a failover pair (part of a large cluster) for the Cassandra Sync and have tried restarting the Cassandra service, and rebooting the DMA.
When running nodetool the Host ID replies with "null" which I suspect is the issue.
Has anyone seen this before?
Thanks
Hi, see config files below. KR Paul
Hi Paul,
From your 'nodetool status' message you can see that the first node (from which you are probably running the 'nodetool status' cmd) is having a status ?N and this means the node is not started Up. The other node is UN (Up and Normal), probably 'nodetool status' on the other node will give you a different result. Can you share that result (you can edit your answer as well).
My first step would be to look into the logging of Cassandra on both nodes to understand what is going wrong. As most likely this is from a Failover setup (both nodes should have all data to have redundancy), you could start focussing on one node to get it started and then focus on the other node. If you are hosting DM and Cassandra on the same OS, it could be that DM is continuously trying to start Cassandra. You can disable the service from the services in Windows if you want to prevent DM from starting Cassandra or you can also stop DM on that node.
Hi Paul,
Can you provide the cassandra.yml file of both cassandra nodes by adding them to the post?
If its a node running on windows OS, you should be able to find thos config files on: “C:\Program Files\Cassandra\conf”