Enable high availability for Streams Replication Manager
Streams Replication Manager is capable of running in high availability mode. This can be enabled by deploying multiple instances of the driver and service role in a cluster.
Streams Replication Manager (SRM) is capable of running in high availability mode. By
enabling high availability mode for SRM, you can ensure that the replication of data and the
monitoring of replication continues even in the case of host failure. To enable SRM high
availability, you have to deploy multiple instances of the driver and service roles on the
hosts in a cluster. In CDP Public Cloud this can be done when provisioning a new cluster with
Data Hub.
Enable high availability mode in CDP Public Cloud
In CDP Public Cloud, high availability mode can be enabled by provisioning a Data Hub
cluster that has multiple instances of the SRM driver and service. In terms of high
availability, the default Streams Messaging cluster definitions behave in the following way:
- Streams Messaging Light Duty
- High availability mode is enabled by default. Any cluster that you provision with this definition will start SRM in high availability mode. Note that it is only the driver that is started in high availability mode, the service role is only provisioned on a single host. This however, is still considered as a highly available deployment of SRM.
- Streams Messaging Heavy Duty
- In the heavy duty definition, SRM has its own host group. However, by default, the SRM host group is not provisioned. When provisioning a cluster with the heavy duty definition, you can decide how many nodes this host group should have. To provision SRM in high availability mode with this cluster definition, you have to set the instance count of the SRM nodes host group to at least 2.
For more information on creating a Streams Messaging cluster with Data Hub, see Creating your first Streams Messaging cluster.
