imamdigmi commented on issue #18312:
URL: https://github.com/apache/airflow/issues/18312#issuecomment-922277685
Thanks for answering @uranusjr . After some exploring, I'm guessing this
problem has to do with schedule intervals. I want to share the DAG, but
unfortunately I can't share the DAG code that I created due to privacy reasons
from my company, but I'm happy to explain about the DAG I made, this is the
schedule interval I use (but mostly we use `@daily`):
1. `@daily`
1. `@hourly`
1. `0 */3 * * *`
1. `0 8 * * *`
1. `0 7 * * *`
1. `0 11 * * *`
1. `0 21 * * *`
1. `30 12 * * *`
1. `0 12 * * *`
1. `0 13 * * *`
These DAGs are generated dynamically with a custom generator that generates
hundreds of DAG Objects with configurable schedule intervals, and here is the
interval map that I made to support that:
```py
def interval_map(alias):
"""Translate the initials of the schedule interval."""
import string
from datetime import timedelta # noqa: F401
res = {"alias": alias, "interval": None}
default = {
"1h": "@hourly",
"1d": "@daily",
"1w": "@weekly",
"1m": "@monthly",
"1q": "@quarterly",
"1y": "@yearly",
}
if alias is None:
res["alias"] = "manual"
res["interval"] = None
return res
alias = alias.translate(str.maketrans("", "", string.whitespace)).lower()
_number, _type = alias[:-1], alias[-1:] # noqa: F841
if alias == "o":
res["alias"] = "once"
res["interval"] = "@once"
return res
if intrv := default.get(alias):
res["alias"] = alias
res["interval"] = intrv
return res
if "h" in alias:
res["alias"] = alias
res["interval"] = f"0 */{_number} * * *"
return res
if "d" in alias:
res["alias"] = alias
res["interval"] = f"0 0 */{_number} * *"
return res
raise ValueError("Unrecognized interval type")
```
then if we use the above function with:
```py
print(interval_map('4h'))
print(interval_map('1w'))
print(interval_map('2d'))
print(interval_map('1d'))
print(interval_map('o'))
print(interval_map(None))
print(interval_map('1q'))
print(interval_map('1m'))
print(interval_map('1y'))
```
the result is:
```
{'alias': '4h', 'interval': '0 */4 * * *'}
{'alias': '1w', 'interval': '@weekly'}
{'alias': '2d', 'interval': '0 0 */2 * *'}
{'alias': '1d', 'interval': '@daily'}
{'alias': 'once', 'interval': '@once'}
{'alias': 'manual', 'interval': None}
{'alias': '1q', 'interval': '@quarterly'}
{'alias': '1m', 'interval': '@monthly'}
{'alias': '1y', 'interval': '@yearly'}
```
however I haven't found any hint based on the code in this line:
https://github.com/apache/airflow/blob/v2-1-stable/airflow/models/dag.py#L492
I hope my explanation can help you find the problem
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