ChainedType vs SimpleTask

[jvancoillie]

What is the advantage of using a chained task rather than a simple task list ?

For example:

    // chained type
    tasks:
      chained:
        type: 'chained'
        single_run: true
        description: 'chained tasks'
        output: true
        output_to_store: true
        tasks:
          command1:
            type: 'command'
            command: 'app:command1'
          command2:
            type: 'command'
            command: 'app:command2'
          command3:
            type: 'command'
            command: 'app:command3'
          command4:
            type: 'command'
            command: 'app:command4'

VS

    // simple FiFO tasks
    tasks:
      command1:
          type: 'command'
          command: 'app:command1'
          single_run: true
      command2:
          type: 'command'
          command: 'app:command2'
          single_run: true
      command3:
          type: 'command'
          command: 'app:command3'
          single_run: true
      command4:
          type: 'command'
          command: 'app:command4'
          single_run: true

This configuration has the advantage of giving information task by task, which is not found on a chained task.
Moreover when we list the tasks bin/console scheduler:list we don't find the detail of the embedded tasks how to know if one of the subtask is failed and the execution time of each of them 🤔

[Guikingone]

This configuration has the advantage of giving information task by task, which is not found on a chained task.

Don't get the point here, could you be more precise?

Moreover when we list the tasks bin/console scheduler:list we don't find the detail of the embedded tasks how to know if one of the subtask is failed and the execution time of each of them 🤔

Actually, that's just a limitation on the display, not on the implementation, the goal that I have in mind is to display the informations of each embedded tasks when using the command:

php bin/console scheduler:list

chained task 

> sub-task
> sub-task

[jvancoillie]

Don't get the point here, could you be more precise?

for example when consulting the entrypoint _tasks?name=chained
i got the following, we can see that I have the execution time and the memory consumption for the main task but I don't have those details for the subtasks

{
  "code": 200,
  "tasks": [
    {
      "body": {
        "tasks": [
          {
            "body": {
              "command": "app:command1",
              "arguments": [],
              "options": [],
              "name": "command1",
              "arrival_time": null,
              "before_scheduling": null,
              "before_scheduling_notification_bag": null,
              "after_scheduling_notification_bag": null,
              "before_executing_notification_bag": null,
              "after_executing_notification_bag": null,
              "after_scheduling": null,
              "before_executing": null,
              "after_executing": null,
              "description": null,
              "expression": "* * * * *",
              "execution_absolute_deadline": null,
              "execution_computation_time": null,
              "execution_delay": null,
              "execution_memory_usage": null,
              "execution_period": null,
              "execution_relative_deadline": null,
              "execution_start_date": null,
              "execution_end_date": null,
              "execution_start_time": null,
              "execution_end_time": null,
              "last_execution": null,
              "max_duration": null,
              "max_executions": null,
              "max_retries": null,
              "nice": null,
              "state": "enabled",
              "execution_state": "succeed",
              "output": false,
              "priority": 0,
              "queued": false,
              "scheduled_at": null,
              "single_run": false,
              "tags": [],
              "timezone": null,
              "tracked": true
            },
            "taskInternalType": "SchedulerBundle\\Task\\CommandTask"
          },
          {
            "body": {
              "command": "app:command2",
              "arguments": [],
              "options": [],
              "name": "command2",
              "arrival_time": null,
              "before_scheduling": null,
              "before_scheduling_notification_bag": null,
              "after_scheduling_notification_bag": null,
              "before_executing_notification_bag": null,
              "after_executing_notification_bag": null,
              "after_scheduling": null,
              "before_executing": null,
              "after_executing": null,
              "description": null,
              "expression": "* * * * *",
              "execution_absolute_deadline": null,
              "execution_computation_time": null,
              "execution_delay": null,
              "execution_memory_usage": null,
              "execution_period": null,
              "execution_relative_deadline": null,
              "execution_start_date": null,
              "execution_end_date": null,
              "execution_start_time": null,
              "execution_end_time": null,
              "last_execution": null,
              "max_duration": null,
              "max_executions": null,
              "max_retries": null,
              "nice": null,
              "state": "enabled",
              "execution_state": "succeed",
              "output": false,
              "priority": 0,
              "queued": false,
              "scheduled_at": null,
              "single_run": false,
              "tags": [],
              "timezone": null,
              "tracked": true
            },
            "taskInternalType": "SchedulerBundle\\Task\\CommandTask"
          },
          
        ],
        "name": "chained",
        "arrival_time": "2021-04-29T08:15:02+00:00",
        "before_scheduling": null,
        "before_scheduling_notification_bag": null,
        "after_scheduling_notification_bag": null,
        "before_executing_notification_bag": null,
        "after_executing_notification_bag": null,
        "after_scheduling": null,
        "before_executing": null,
        "after_executing": null,
        "description": "deploy single_run command",
        "expression": "* * * * *",
        "execution_absolute_deadline": null,
        "execution_computation_time": 19093579,
        "execution_delay": null,
        "execution_memory_usage": 6487882832,
        "execution_period": null,
        "execution_relative_deadline": null,
        "execution_start_date": null,
        "execution_end_date": null,
        "execution_start_time": "2021-04-29T08:15:02+00:00",
        "execution_end_time": "2021-04-29T13:33:15+00:00",
        "last_execution": "2021-04-29T13:33:15+00:00",
        "max_duration": null,
        "max_executions": null,
        "max_retries": null,
        "nice": null,
        "state": "paused",
        "execution_state": "succeed",
        "output": true,
        "priority": 0,
        "queued": false,
        "scheduled_at": "2021-04-29T07:16:12+00:00",
        "single_run": true,
        "tags": [
          "deploy"
        ],
        "timezone": "UTC",
        "tracked": true
      },
      "taskInternalType": "SchedulerBundle\\Task\\ChainedTask"
    }
  ]
}

[Guikingone]

This limitation is due to the execution of ChainedTask not the fact that we're using ChainedTask 🤔

Issue: #77

[jvancoillie]

yes I see well, indeed when it will be implemented we will find the information.

But in this case what advantage does one or the other solution bring

[Guikingone]

ChainedTask act as a wrapper for multiple tasks, the idea is to be able to create group of tasks that need to be executed at the same time / are related.

By default, tasks cannot be grouped for now outside of ChainedTask 🙂