baolsen commented on a change in pull request #6999: [AIRFLOW-XXXX] Clarify
wait_for_downstream and execution_date
URL: https://github.com/apache/airflow/pull/6999#discussion_r362745923
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File path: docs/concepts.rst
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@@ -341,62 +471,21 @@ is equivalent to:
[op4, op5] >> op6
-Tasks
-=====
-
-Once an operator is instantiated, it is referred to as a "task". The
-instantiation defines specific values when calling the abstract operator, and
-the parameterized task becomes a node in a DAG.
-
-Task Instances
-==============
-
-A task instance represents a specific run of a task and is characterized as the
-combination of a DAG, a task, and a point in time. Task instances also have an
-indicative state, which could be "running", "success", "failed", "skipped", "up
-for retry", etc.
-
-Task Lifecycle
-==============
-
-A task goes through various stages from start to completion. In the Airflow UI
-(graph and tree views), these stages are displayed by a color representing each
-stage:
-
-.. image:: img/task_stages.png
-
-The complete lifecycle of the task looks like this:
-
-.. image:: img/task_lifecycle_diagram.png
-
-The happy flow consists of the following stages:
-
-1. No status (scheduler created empty task instance)
-2. Scheduled (scheduler determined task instance needs to run)
-3. Queued (scheduler sent task to executor to run on the queue)
-4. Running (worker picked up a task and is now running it)
-5. Success (task completed)
-
-There is also visual difference between scheduled and manually triggered
-DAGs/tasks:
-
-.. image:: img/task_manual_vs_scheduled.png
-
-The DAGs/tasks with a black border are scheduled runs, whereas the non-bordered
-DAGs/tasks are manually triggered, i.e. by ``airflow dags trigger``.
-
Workflows
=========
You're now familiar with the core building blocks of Airflow.
Some of the concepts may sound very similar, but the vocabulary can
be conceptualized like this:
-- DAG: a description of the order in which work should take place
Review comment:
Changed wording for some of these and added others
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