ZooKeeper service management via ADCM

Elena Kostyuchenko

The ADCM UI provides actions to manage the ZooKeeper service and its components. For information on how to run service actions, refer to ADH service actions.

The actions available for the ZooKeeper service are listed in the table below.

For more information about the service and its components, see the ZooKeeper article.

Action Description

Add/Remove components

Running this action opens the component-host mapping interface where you can add, remove, and distribute ZooKeeper components

Check

Runs service-specific tests to check the health of the service and its components

Start

Starts the service. When you run this action, the option Apply configs from ADCM is available. If it is set to true, all service configurations defined in ADCM settings will be applied on the service startup. Otherwise, the service starts without applying configurations from ADCM

Stop

Stops the service

Remove

Removes the service from the cluster. This action should be used to remove already installed services. Whereas the delete control can be used to remove a non-mapped service (a service which components have not been distributed among cluster hosts)

Restart

Restarts the service. When you run this action, the option Apply configs from ADCM is available. If it is set to true, all service configurations defined in ADCM settings will be applied during the service restart. Otherwise, the service restarts without applying configurations from ADCM ​.

The service supports the Rolling restart option (enabled by default) that allows you to restart ZooKeeper Server components one by one rather than all at once. This feature helps to avoid the service downtime and provides more flexible restart configuration.

The Rolling restart option has the following parameters:

  • delay — the delay in seconds between restarting individual ZooKeeper Server components.

  • max_failed_instances_number — the maximum number of ZooKeeper Server instances allowed to fail during restart. Upon reaching this value, the Restart ADCM action fails.

  • health_checks — indicates whether to perform health checks of the restarted ZooKeeper Servers.
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