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Maintained by AxonOps — production-grade documentation from engineers who operate distributed databases at scale

Overview

AxonOps provides a rolling restart feature for Cassandra.

The feature is accessible via Operations > Rolling Restart.

Rolling restarts

The AxonOps user requires permissions to stop and start the Cassandra service. Add the AxonOps user to sudoers, for example: 

#/etc/sudoers.d/axonops
axonops ALL=NOPASSWD: /sbin/service cassandra *, /usr/bin/systemctl * cassandra*

You can start an immediate rolling restart or schedule it.

The script field lets you customize the predefined script executed by the AxonOps agent during the restart process.

You can also specify different degrees of parallelism for the restart: DC, Rack, and Node.

For example, to restart one entire rack at once across the cluster, set a large Node parallelism (greater than the number of nodes in the rack, for example 999). 

DC parallelism: 1
Rack parallelism: 1
Node parallelism: 999

To restart one entire rack across each DC: 

DC parallelism: 999
Rack parallelism: 1
Node parallelism: 999