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Switch

The switch is a conditional judgment node, decide the branch executes according to the value of global variable and the expression result written by the user.

Create

Drag from the toolbar task node to canvas to create a task. Note After created a switch task, you must first configure the upstream and downstream, then configure the parameter of task branches.

Parameter

  • Node name: The node name in a workflow definition is unique.
  • Run flag: Identifies whether this node schedules normally, if it does not need to execute, select the prohibition execution.
  • Descriptive information: Describe the function of the node.
  • Task priority: When the number of worker threads is insufficient, execute in the order of priority from high to low, and tasks with the same priority will execute in a first-in first-out order.
  • Worker grouping: Assign tasks to the machines of the worker group to execute. If Default is selected, randomly select a worker machine for execution.
  • Times of failed retry attempts: The number of times the task failed to resubmit. You can select from drop-down or fill-in a number.
  • Failed retry interval: The time interval for resubmitting the task after a failed task. You can select from drop-down or fill-in a number.
  • Timeout alarm: Check the timeout alarm and timeout failure. When the task runs exceed the "timeout", an alarm email will send and the task execution will fail.
  • Condition: You can configure multiple conditions for the switch task. When the conditions are satisfied, execute the configured branch. You can configure multiple different conditions to satisfy different businesses.
  • Branch flow: The default branch flow, when all the conditions are not satisfied, execute this branch flow.

Detail

Here we have three tasks, the dependencies are A -> B -> [C, D], and task_a is a shell task and task_b is a switch task

  • In task A, a global variable named id is defined through global variable, and the declaration method is ${setValue(id=1)}
  • Task B adds conditions and uses global variables declared upstream to achieve conditional judgment (Note: switch can get the global variables value, as long as its direct or indirect upstream have already assigned the global variables before switch acquires). We want to execute task C when id = 1, otherwise run task D
    • Configure task C to run when the global variable id=1. Then edit ${id} == 1 in the condition of task B, and select C as branch flow
    • For other tasks, select D as branch flow

The following shows the switch task configuration:

task-switch-configure

Related Task

condition๏ผšConditiontask mainly executes the corresponding branch based on the execution result status (success, failure) of the upstream node. The Switch task mainly executes the corresponding branch based on the value of the global parameter and the judgment expression result written by the user.