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Deploy a Coordination Service Ensemble

Tableau Server on Windows now includes Tableau Services Manager (TSM), which replaces the Configuration Utility and the tabadmin command line tool. If you need help for an earlier version of Tableau Server, see the Tableau Help page.

The Coordination Service is built on Apache ZooKeeper, an open-source project, and coordinates activities on the server, guaranteeing a quorum in the event of a failure, and serving as the source of "truth" regarding the server topology, configuration, and state. The service is installed automatically on the initial Tableau Server node, but no additional instances are installed as you add additional nodes. Because the successful functioning of Tableau Server depends on a properly functioning Coordination Service, we recommend that for server installations of three or more nodes, you add additional instances of the Coordination Service by deploying a new Coordination Service ensemble. This provides redundancy and improved availability in the event that one instance of the Coordination Service has problems.

For information on deploying an ensemble on Coordination Service-only nodes, nodes that are dedicated to the ensemble, see Configure Tableau Server for High Availability with Coordination Service-Only Nodes.

Hardware requirements

The hardware you use for Tableau Server can have an effect on how well the Coordination Service runs. In particular:

  • Memory. The Coordination Service maintains state information in memory. By design, the memory footprint is small, and is typically not a factor in overall server performance.

  • Disk speed. Because the service stores state information on disk, it benefits from fast disk speed on the individual node computers.

  • Connection speed between nodes. The service communicates continuously between cluster nodes; a fast connection speeds between nodes helps with efficient synchronization.

Because the Coordination Service is I/O intensive, if you are running Tableau Server on computers that meet or just exceed the minimum hardware requirements, you may want to configure a Coordination Service ensemble that puts the service on nodes that are not being used for other server processes. This reduces the chance of delays due to I/O contention between server processes. For information on how to deploy an ensemble on dedicated nodes, see Configure Tableau Server for High Availability with Coordination Service-Only Nodes below.

The Coordination Service Quorum

To ensure that the Coordination Service can work properly, the service requires a quorum—a minimum number of instances of the service. This means that the number of nodes in your installation impacts how many instances of the Coordination Service you want to configure in your ensemble.

Number of Coordination Service instances to use

The maximum number of Coordination Service instances you can have in an ensemble on Tableau Server depends on how many Tableau Server nodes you have in your deployment. Configure a Coordination Service ensemble based on these guidelines:

Total number of server nodes Recommended number of Coordination Service nodes in ensemble (must be 1, 3, or 5) Notes
1-2 nodes 1 node This is the default and requires no changes unless you want to move the Coordination Service off your initial node and onto your additional node.
3-4 nodes 3 nodes  
5 or more nodes 5 nodes Five is the maximum number of Coordination Service instances you can install.

 

Deploy a new Coordination Service ensemble

If you install a total of three or more nodes, you should also deploy a Coordination Service ensemble. If you do not, you will get a warning message every time you make changes to the server configuration or topology. You can ignore this message, but as a best practice you should deploy a multi-node Coordination Service ensemble.

When you install Tableau Server, a single instance of the Coordination Service is installed on the initial node. TSM and Tableau Server depend on the Coordination Service to function properly, so to provide redundancy and ensure availability on multi-node installations, configure additional instances of the Coordination Service by deploying a Coordination Service ensemble. Coordination Service ensembles are installed with one, three, or five instances of the Coordination Service. In a three-node installation of Tableau Server, the recommended number of Coordination Service instances is three, one on each node.

Note: This operation includes steps that you may need to perform using the TSM command line. To use the TSM CLI you need administrator access to the command line on one of the nodes in your installation and TSM administrator credentials to run TSM commands.

The following steps illustrate how to deploy a new Coordination Service ensemble on an existing three-node Tableau Server cluster and clean up the old ensemble.

  1. On the initial node, open a command prompt as administrator.

  2. Type this command to sign in to Tableau Server as a TSM administrator:

    tsm login -u <username>

    You will be prompted for your password.

  3. Type this command to stop Tableau Server:

    tsm stop

    Some TSM processes will continue to run, including the Administration Controller and Administration Agent.

  4. Get the node IDs for each node in the cluster:

    tsm topology list-nodes -v

  5. Use the tsm topology deploy-coordination-service command to add a new Coordination Service ensemble by adding the Coordination Service to specified nodes. You must specify the node(s) that the Coordination Service should be added to. The command also makes the new ensemble the "production" ensemble (the ensemble in use).

    For example, deploy the Coordination Service to all three nodes of a three-node cluster:

    tsm topology deploy-coordination-service -n node1,node2,node3

  6. Wait until the new Coordination Service ensemble is running.

    After deploying the new Coordination Service ensemble, wait several minutes before checking the status of the server. If you check the status before the deployment is complete, you may get unreliable results, with some processes showing as running when they are not, and the Coordination Service showing a status of "unavailable" while the service is synchronizing between nodes on the cluster. Tableau Server may show as being in an error state while this is happening.

  7. Verify that the new Coordination Service ensemble is running properly:

    tsm status -v

    On the initial node you should see:

    • Two instances of the Coordination Service, both with a status of "running".

    • The Administration Controller with a status of "running". (The Administration Controller is only installed on the initial node.)

    • The Administration Agent with a status of "running".

    If you do not see a status of "running" for all of the above, wait a few minutes and run the status command again.

  8. Continue to check the status until you are prompted to sign into TSM again. When you are prompted to sign in, the new ensemble is running, and you can remove the old ensemble.

    Note: If there is a problem with an instance of the Coordination Service (if it shows as stopped for example), you can toggle back to your previous Coordination Service ensemble using the tsm topology toggle-coordination-service command. To do this, the Administration Controller and Agent should be running. You can toggle back to the previous ensemble only if you have not run the cleanup-coordination-service command. Tableau Server cannot be running when you use this command.

  9. When you are prompted to sign in, the new ensemble is running properly. Sign in to TSM and remove the old ensemble. This step is required. You cannot run Tableau Server with multiple Coordination Service ensembles configured.

    tsm topology cleanup-coordination-service

    Tableau Server must be stopped when you use this command.

  10. Start Tableau Server:

    tsm start

For more information and details on deploying a new Coordination Service ensemble, see Deploy a new Coordination Service ensemble.