blocks|key|2829968|text|如果您希望一次只运行一个实例，那么可以尝试设置max_active_runs=1|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2829969|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

if you want to just run one instance at a time then try setting
max_active_runs=1

blocks|key|2830000|text|这个答案可能有点晚了，但我遇到了同样的问题，我解决这个问题的方法是在每个dag中添加两个额外的任务。开头是"Previous“，结尾是"Complete”。前一个任务是外部任务传感器，它监视前一个任务。Complete只是一个虚设操作符。假设它每30分钟运行一次，那么dag将如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2830001|dag+=+DAG(dag_id='TEST_DAG',+default_args=default_args,+schedule_interval=timedelta(minutes=30))

PREVIOUS+=+ExternalTaskSensor(
++++task_id='Previous_Run',
++++external_dag_id='TEST_DAG',
++++external_task_id='All_Tasks_Completed',
++++allowed_states=['success'],
++++execution_delta=timedelta(minutes=30),
++++dag=DAG
)

T1+=+BashOperator(
++++task_id='TASK_01',
++++bash_command='echo+"Hello+World+from+Task+1"',
++++dag=dag
)

COMPLETE+=+DummyOperator(
++++task_id='All_Tasks_Completed',
++++dag=DAG
)

PREVIOUS+>>+T1+>>+COMPLETE|code-block|syntax|javascript|2830002|因此，下一个dag，即使它将进入队列，它也不会让任务运行，直到前一个任务完成。|2830003|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Might be a bit late for this answer, but I ran into the same issue and the way I resolved it is I added two extra tasks in each dag. "Previous" at the start and "Complete" at the end. Previous task is external task sensor which monitors previous job. Complete is just a dummy operator. Lets say it runs every 30 minutes so the dag would look like this:

<pre><code>dag = DAG(dag_id='TEST_DAG', default_args=default_args, schedule_interval=timedelta(minutes=30))

PREVIOUS = ExternalTaskSensor(
 task_id='Previous_Run',
 external_dag_id='TEST_DAG',
 external_task_id='All_Tasks_Completed',
 allowed_states=['success'],
 execution_delta=timedelta(minutes=30),
 dag=DAG
)

T1 = BashOperator(
 task_id='TASK_01',
 bash_command='echo "Hello World from Task 1"',
 dag=dag
)

COMPLETE = DummyOperator(
 task_id='All_Tasks_Completed',
 dag=DAG
)

PREVIOUS &gt;&gt; T1 &gt;&gt; COMPLETE
</code></pre>

So the next dag, even tho it will come into the queue, it will not let tasks run until PREVIOUS is completed.

blocks|key|2030325|text|最终对我起作用的是以下几点|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2030326|在创建dag时，添加任务依赖项:+depends_on_past=True|2030327|Adding，|unordered-list-item|2030328|+to。我确实尝试将max_active_runs添加为默认参数，但这不起作用。|ordered-list-item|2030329|2030330|2030331|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|P|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|Q|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

What ended up working for me is a combination of 

<ol>
<li>Adding task dependencies : wait_for_downstream=True, depends_on_past=True</li>
<li>Adding max_active_runs:1 to while creating the dag. I did try to add max_active_runs as a default argument, but that did not work.</li>
</ol>

blocks|key|123543|text|您可以在不执行任何额外任务的情况下实现相同的功能。诀窍就是add+a+dependency+from+the+1st+task+to+the+last+task+and+set+wait_for_downstream=True+for+the+1st+task。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|123544|在这种情况下，下一个DAGrun的第一个任务将一直等到当前运行的最后一个任务完成。因此，未来的DAGruns将被搁置。然后，您可以设置max_active_runs=1以限制此类保留计划。|123545|这里给出了一个详细的示例airflow-dag-past-run-sense|123546|看看它们的依赖关系。|123547|with+DAG('dag_past_run_sense',
+++++++++schedule_interval='*/2+*+*+*+*',
+++++++++default_args=default_args,
+++++++++max_active_runs=1)+as+dag:

++++read_incr_data+=+BashOperator(
++++++++task_id='read_incr_data',
++++++++wait_for_downstream=True,
++++++++bash_command='date'
++++)

++++prepare_scd2+=+BashOperator(
++++++++task_id='prepare_scd2',
++++++++bash_command='date'
++++)

++++load_final_table+=+PythonOperator(
++++++++task_id="load_final_table",
++++++++python_callable=load_final_table_status
++++)

++++read_incr_data+>>+prepare_scd2+>>+load_final_table
++++read_incr_data+>>+load_final_table|code-block|syntax|javascript|123548|entityMap|0|LINK|mutability|MUTABLE|url|https://soyelherein.tech/blog/airflow-dag-past-run-sense.html^0|T|2T|0|1V|H|0|C|Q|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|14|8|@]|D|@$9|15|A|16|1|17]]|E|$]]|$1|J|3|K|5|6|7|18|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|19|8|@]|D|@]|E|$O|P]]|$1|Q|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

You can achieve the same without any additional tasks. The trick is <code>add a dependency from the 1st task to the last task and set wait_for_downstream=True for the 1st task</code>.
In that case, the 1st task of the next DAGrun will wait until the last task of the current run is complete. So the future DAGruns will be on hold. You can then set <code>max_active_runs=1</code> to limit such on-hold schedules.
A detailed example is given here <a href="https://soyelherein.tech/blog/airflow-dag-past-run-sense.html" rel="nofollow noreferrer">airflow-dag-past-run-sense</a>
Look at the dependencies.
<pre><code>
with DAG('dag_past_run_sense',
 schedule_interval='*/2 * * * *',
 default_args=default_args,
 max_active_runs=1) as dag:

 read_incr_data = BashOperator(
 task_id='read_incr_data',
 wait_for_downstream=True,
 bash_command='date'
 )

 prepare_scd2 = BashOperator(
 task_id='prepare_scd2',
 bash_command='date'
 )

 load_final_table = PythonOperator(
 task_id=&quot;load_final_table&quot;,
 python_callable=load_final_table_status
 )

 read_incr_data &gt;&gt; prepare_scd2 &gt;&gt; load_final_table
 read_incr_data &gt;&gt; load_final_table
</code></pre>

Right now, nodes in my DAG proceeds to the next day's task before the rest of the nodes of that DAG finishes. Is there a way for it to wait for the rest of the DAG to finish before moving unto the next day's DAG cycle?

(I do have depends_on_past as true, but that does not work in this case)

My DAG looks like this:

<pre><code> O
 l
 V
O -&gt; O -&gt; O -&gt; O -&gt; O
</code></pre>

Also, tree view pic of the dag]

<img src="https://i.stack.imgur.com/LgQGB.png" alt="tree view pic of the dag">

Is it possible for Airflow scheduler to first finish the previous day's cycle before starting the next?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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现在，我的DAG中的节点在该DAG的其余节点完成之前继续执行第二天的任务。有没有办法让它等待DAG的其余部分完成后再进入第二天的DAG周期？(我的depends_on_past是真的，但在这种情况下不起作用)我的DAG看起来像这样：               O               l            ...

问是否可以让气流调度器先完成前一天的循环，然后再开始下一天的循环？
EN

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问是否可以让气流调度器先完成前一天的循环，然后再开始下一天的循环？EN