jedcunningham commented on issue #41505:
URL: https://github.com/apache/airflow/issues/41505#issuecomment-2293050972
This is a better reproduction DAG:
```
with DAG("aaa_repro", schedule=None):
start = EmptyOperator(task_id="start")
a = [
start
>> EmptyOperator(task_id=f"a_1_{i}")
>> EmptyOperator(task_id=f"a_2_{i}")
>> EmptyOperator(task_id=f"a_3_{i}")
for i in range(200)
]
middle = EmptyOperator(task_id="middle")
b = [
middle
>> EmptyOperator(task_id=f"b_1_{i}")
>> EmptyOperator(task_id=f"b_2_{i}")
>> EmptyOperator(task_id=f"b_3_{i}")
for i in range(200)
]
middle2 = EmptyOperator(task_id="middle2")
c = [
middle2
>> EmptyOperator(task_id=f"c_1_{i}")
>> EmptyOperator(task_id=f"c_2_{i}")
>> EmptyOperator(task_id=f"c_3_{i}")
for i in range(200)
]
end = EmptyOperator(task_id="end")
start >> a >> middle >> b >> middle2 >> c >> end
```
It uses 5+GB and takes just under 8 minutes to generate on my machine.
And I believe it's less about the whitespace and more that we duplicate
tasks in the output. For example, this DAG:
```
with DAG("aaa_runaway", schedule=None):
start = EmptyOperator(task_id="start")
x = [EmptyOperator(task_id=f"x_{i}") for i in range(3)]
middle = EmptyOperator(task_id="middle")
y = [EmptyOperator(task_id=f"y_{i}") for i in range(3)]
end = EmptyOperator(task_id="end")
start >> x >> middle >> y >> end
```
which results in this output:
```
<Task(EmptyOperator): start>
<Task(EmptyOperator): x_0>
<Task(EmptyOperator): middle>
<Task(EmptyOperator): y_0>
<Task(EmptyOperator): end>
<Task(EmptyOperator): y_1>
<Task(EmptyOperator): end>
<Task(EmptyOperator): y_2>
<Task(EmptyOperator): end>
<Task(EmptyOperator): x_1>
<Task(EmptyOperator): middle>
<Task(EmptyOperator): y_0>
<Task(EmptyOperator): end>
<Task(EmptyOperator): y_1>
<Task(EmptyOperator): end>
<Task(EmptyOperator): y_2>
<Task(EmptyOperator): end>
<Task(EmptyOperator): x_2>
<Task(EmptyOperator): middle>
<Task(EmptyOperator): y_0>
<Task(EmptyOperator): end>
<Task(EmptyOperator): y_1>
<Task(EmptyOperator): end>
<Task(EmptyOperator): y_2>
<Task(EmptyOperator): end>
```
Note how we get 9 `ends`. If you have a sufficiently complex DAG, this
format becomes really problematic.
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