ZooKeeper actions
This article describes the main actions available for working with the service using the Actions 
icon in ADCM.
To go to the actions in the service, do the following:
-
On the CLUSTERS tab click on the row with the cluster.
-
In the cluster menu that opens, go to the Services page.
-
Click on the Actions icon
in the row corresponding to the
ZooKeeper
service and choose the desired action.
To view the results of an action, go to JOBS and click on the name of the corresponding action or on its component.
Next, the page with the results of the action becomes available for viewing, where you can analyze errors if they occur.
Check
The Check action checks the health of the service.
After selection, confirm the action by clicking Run.
In ZooKeeper, Check connects to the ZooKeeper quorum, creates a test znode in it, and checks that the created znode is available to each of the quorum hosts.
Expand
The Expand action expands the number of service instances in the established cluster. To expand the number of service instances, do the following:
-
Set options for installing new instances of the service.
-
Confirm your choice by clicking Next.
Configuration to run cluster extensionOptions for installing new service instancesOption Description Disable SELinux
Disable SELinux on added hosts. In order for this setting to take effect, after the Install operation is completed, you must restart the hosts manually
Disable Firewalld
Shutting down firewalld on hosts
Install OpenJDK
Installing java-1.8.0-openjdk package on hosts
Set vm.swappiness to 0
Disabling swapping on hosts
Configure /etc/hosts
Write added nodes to /etc/hosts on cluster hosts. It is recommended to disable this option if DNS is configured
-
Add the required number of hosts and place on it the components available for placement.
-
Confirm the action by clicking Run.
Installing service components for cluster expansion
|
NOTE
The number of ZooKeeper instances must be odd.
|
Shrink
The Shrink action reduces the number of service instances in the installed cluster. To reduce the number of service instances, do the following:
-
Select which components to remove from which host.
-
Confirm the action by clicking Run.
Restart
The Restart action stops and then starts the service.
After selection, confirm the action by clicking Run.
