Cluster

The Cluster module allows multiple Bridges in a Qntrl account to work together with shared responsibilities. This group of Bridges provides fail-over protection, ensuring continuous functionality even if one of the Bridges faces any real-time network limitations. Additionally, the Bridge Cluster can evenly distribute tasks amongst all available Bridges, ensuring smooth task execution and improved system reliability.

Clusters provide two types of services to ensure the smooth operation of Bridges as per the process automation requirement; they are:

Failover protection
Load Balancing

Failover protection

In a Failover Cluster, multiple Bridges are grouped to overcome task failures caused by a Bridge downtime. This ensures uninterrupted task execution, even in the event of unexpected power outages, machine restarts, network issues, and more. If one Bridge fails, another Bridge within the cluster seamlessly takes over the responsibilities of the failed Bridge.

Independent operation of Bridge within Fail-over Cluster

Each Bridge within a fail-over cluster operates independently and does not share the load with other Bridges in the same cluster. This independent operation ensures that each Bridge handles its tasks efficiently without being affected by other Bridge's workloads in the cluster.

Example: When a message request is sent to Bridge B, the system checks if Bridge B is active. If it is, the task is assigned and executed using Bridge B. If Bridge B is not active, the system looks at the Clusters it's part of.

Let's say Bridge B is part of the following Clusters:

Cluster 1 - Bridge A(load 20) and Bridge B(load 20)

Cluster 2 - Bridge B(load 20), Bridge C(load 10) and Bridge D(load 30).

Currently, only Bridge A and Bridge C are active.

The system then selects the available active Bridges from the Clusters, which are Bridge A, and Bridge C and the task is assigned to Bridge C because it has the lower load.

Load Balancing

Load-balancing clusters distribute task execution across multiple Bridges based on their current load. When a task is executed using a Bridge within a load balancing cluster, the task is assigned to the Bridge with the least load by default. Load here refers to the number of tasks (message executions) currently assigned to each Bridge in the cluster.

Automatic Fail-over support in Load Balancing Cluster

A Bridge added to a Load Balancing Cluster automatically receives fail-over support. In case a Bridge within this cluster fails, another Bridge in the same cluster will take over its responsibilities, ensuring continuous task execution.

Example: When a message request is sent to Bridge B. The system checks at all the Bridges in the Cluster where Bridge B is a part of.

Let's say Bridge B is a part of three Load Balancing Clusters:

Cluster 1 - Bridge A (load 20), Bridge B (load 20)

Cluster 2 - Bridge B (load 20), Bridge C (load 10)

Cluster 3 - Bridge B (load 20), Bridge C (load 10), and Bridge D (load 40).

Currently, only Bridge B and Bridge C are active.

The system then gives the task to the active Bridge with the least load. In this example, Bridge C has the least load (10), so the task is given to Bridge C. This makes sure that tasks are spread out efficiently among the bridges that are available.

Combining Fail-Over protection and Load Balancing

It is possible to add a Bridge to both types of clusters simultaneously, allowing it to be configured for load balancing and fail-over protection concurrently. This provides an optimal balance between workload distribution and system reliability. However, it's important to ensure that all Bridges grouped in the cluster are associated with the same module to enable a seamless task handover process.

If all the Bridges in the cluster are down, the task will get aborted or task execution will be failed.
The Cluster operates only before a task is executed. If the Bridge encounters issues after the task is assigned, the Cluster concept does not apply.

Prerequisite

To configure a Bridge in a Cluster, we must add Bridges that are associated with the same tasks and should have the same capabilities.

All Bridges assigned to a Cluster must belong to the same network.

Create a Cluster

To create a new Cluster:

Click the settings gear icon at the top-right of the header bar.
Navigate to Advanced >> Bridge >> choose Cluster.
Click New Cluster.
Fill in the new Cluster details:

Name: Provide a unique name for the Cluster.
Type: Select the type of Cluster.

Failover
Load Balancing

Bridge Name: Select the Bridge names that are to be added to the Cluster from the Multi-select list.

Click Save.

Edit a Cluster

To update the details of an existing Cluster:

Navigate to(settings)>> Advanced >> Bridge >> select Cluster.
In the list page loaded, hover over the name of the Cluster, click the mouse over action menu , and select Edit.
Make modifications and click Save.

Delete a Cluster

To remove a Cluster from Qntrl:

Navigate to(settings) >> Advanced >> Bridge >> select Cluster.
Hover over the name of the Cluster you want to delete, click mouse over action menu , and select Delete.
Confirm the delete action.

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