I have a cassandra cluster of 3 nodes setup with replication set to 2 and I am trying to make it collect the performance data from OpenNMS I have setup newts schema too, but not able to figure out how should I make it collect data from OpenNMS? any suggestions.
Thanks in Advance.
Have you followed this guide for setting up Cassandra with the Newts schema and configuring OpenNMS Horizon?
Related
Is it possible to config replication factor and clustering for each database(or keyspace) or we must just config it for hole yugabyte instance?
At the moment, replication factor is per cluster/universe, and cannot be specified at the database/keyspace level. Could you please file a GitHub issue for this enhancement? It is something that was planned but we did not get around to it.
Not sure what you mean by clustering... all databases/keyspaces and their replicas in a node are allowed to use all nodes in the cluster. Could you please explain what you're trying to achieve?
we are trying to add a node to the existing ring where in security is enabled and default cassandra user is made nonsuper. Also, alerted keyspace to networktopology with replication = no.of nodes. The ring is currently on AWS.
Once the new node joins the cluster, only user we see is nonsuper cassandra user. we are pretty much lokced out of the cluster. However, once we remove the newly joined node, all the security that we had before comes back.
Are there any best practices that we need to follow to enable security in 3.9?
Thanks in advance for helping me out on this.!!
We need to choose between HazelCast Or Cassandra as a distributed data store option. I have worked with cassandra but not with Hazelcast, will like to have a comparative analysis done features like :
Replication
Scalability
Availability
Data Distribution
Performance of reads/writes
Consistency
Will appreciate some help here to help us make the right choice.
The following page and the documents on the page might help on your decision: https://hazelcast.com/use-cases/nosql/apache-cassandra-replacement/
https://db-engines.com/en/system/Cassandra%3BHazelcast
I'd like to enable vnodes on my cassandra cluster, which has an Analytics dc and a regular Cassandra dc. I am using OpsCenter 5.0.1 and DSE 4.5. My question is: how can I create a new dc with OpsCenter, with vnodes enabled, so I can transfer my data over from my existing dc's. I am following the instructions on this page, but surely I don't have to manually edit the config file on every node, to enable a new datacenter, right? Any help much appreciated.
Unfortunately OpsCenter's automated provisioning doesn't currently support creating multi-dc clusters or adding data centers to existing clusters. We know this is important functionality that's missing, and are working on making that available as soon as we can.
I have a cluster with 3 servers and I am trying to create Datastax Cassandra Cluster with the following configuration. Should I leave it to Datastax default values or what are the recommended values?
failover.retryPolicy = ?
failover.reconnectionPolicyDelayMs = ?
pooling.coreConnectionsPerHost = ?
pooling.maxConnectionPerHost= ?
socket.keepAlive=?
socket.reuseAddress=?
socket.tcpNoDelay=?
socket.receiveBufferSize=?
socket.sendBufferSize=?
Thanks in advance
Both Cassandra and the DataStax drivers are shipping with pretty sane default configurations. I'd say you should start developing your application and turn to tuning the configuration only at the time you notice that your specific scenario and deployment setup require changes.