vatsrahul1001 opened a new issue, #48546:
URL: https://github.com/apache/airflow/issues/48546
### Apache Airflow version
3.0.0
### If "Other Airflow 2 version" selected, which one?
_No response_
### What happened?
Getting below error in API server logs when trying running mapped task. I
see the task runs fine though
```
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/usr/local/lib/python3.9/site-packages/uvicorn/protocols/http/httptools_impl.py",
line 409, in run_asgi
result = await app( # type: ignore[func-returns-value]
File "/usr/local/lib/python3.9/site-packages/fastapi/applications.py",
line 1054, in __call__
await super().__call__(scope, receive, send)
File "/usr/local/lib/python3.9/site-packages/starlette/applications.py",
line 112, in __call__
await self.middleware_stack(scope, receive, send)
File
"/usr/local/lib/python3.9/site-packages/starlette/middleware/errors.py", line
187, in __call__
raise exc
File
"/usr/local/lib/python3.9/site-packages/starlette/middleware/errors.py", line
165, in __call__
await self.app(scope, receive, _send)
File
"/usr/local/lib/python3.9/site-packages/starlette/middleware/gzip.py", line 29,
in __call__
await responder(scope, receive, send)
File
"/usr/local/lib/python3.9/site-packages/starlette/middleware/gzip.py", line
126, in __call__
await super().__call__(scope, receive, send)
File
"/usr/local/lib/python3.9/site-packages/starlette/middleware/gzip.py", line 46,
in __call__
await self.app(scope, receive, self.send_with_compression)
File
"/usr/local/lib/python3.9/site-packages/starlette/middleware/cors.py", line 85,
in __call__
await self.app(scope, receive, send)
File
"/usr/local/lib/python3.9/site-packages/starlette/middleware/base.py", line
178, in __call__
recv_stream.close()
File "/usr/local/lib/python3.9/contextlib.py", line 137, in __exit__
self.gen.throw(typ, value, traceback)
File "/usr/local/lib/python3.9/site-packages/starlette/_utils.py", line
82, in collapse_excgroups
raise exc
File
"/usr/local/lib/python3.9/site-packages/starlette/middleware/base.py", line
175, in __call__
response = await self.dispatch_func(request, call_next)
File
"/opt/airflow/airflow-core/src/airflow/api_fastapi/core_api/middleware.py",
line 28, in dispatch
response = await call_next(request)
File
"/usr/local/lib/python3.9/site-packages/starlette/middleware/base.py", line
153, in call_next
raise app_exc
File
"/usr/local/lib/python3.9/site-packages/starlette/middleware/base.py", line
140, in coro
await self.app(scope, receive_or_disconnect, send_no_error)
File
"/usr/local/lib/python3.9/site-packages/starlette/middleware/exceptions.py",
line 62, in __call__
await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
File
"/usr/local/lib/python3.9/site-packages/starlette/_exception_handler.py", line
53, in wrapped_app
raise exc
File
"/usr/local/lib/python3.9/site-packages/starlette/_exception_handler.py", line
42, in wrapped_app
await app(scope, receive, sender)
File "/usr/local/lib/python3.9/site-packages/starlette/routing.py", line
714, in __call__
await self.middleware_stack(scope, receive, send)
File "/usr/local/lib/python3.9/site-packages/starlette/routing.py", line
734, in app
await route.handle(scope, receive, send)
File "/usr/local/lib/python3.9/site-packages/starlette/routing.py", line
288, in handle
await self.app(scope, receive, send)
File "/usr/local/lib/python3.9/site-packages/starlette/routing.py", line
76, in app
await wrap_app_handling_exceptions(app, request)(scope, receive, send)
File
"/usr/local/lib/python3.9/site-packages/starlette/_exception_handler.py", line
53, in wrapped_app
raise exc
File
"/usr/local/lib/python3.9/site-packages/starlette/_exception_handler.py", line
42, in wrapped_app
await app(scope, receive, sender)
File "/usr/local/lib/python3.9/site-packages/starlette/routing.py", line
73, in app
response = await f(request)
File "/usr/local/lib/python3.9/site-packages/fastapi/routing.py", line
301, in app
raw_response = await run_endpoint_function(
File "/usr/local/lib/python3.9/site-packages/fastapi/routing.py", line
214, in run_endpoint_function
return await run_in_threadpool(dependant.call, **values)
File "/usr/local/lib/python3.9/site-packages/starlette/concurrency.py",
line 37, in run_in_threadpool
return await anyio.to_thread.run_sync(func)
File "/usr/local/lib/python3.9/site-packages/anyio/to_thread.py", line 56,
in run_sync
return await get_async_backend().run_sync_in_worker_thread(
File "/usr/local/lib/python3.9/site-packages/anyio/_backends/_asyncio.py",
line 2470, in run_sync_in_worker_thread
return await future
File "/usr/local/lib/python3.9/site-packages/anyio/_backends/_asyncio.py",
line 967, in run
result = context.run(func, *args)
File
"/opt/airflow/airflow-core/src/airflow/api_fastapi/core_api/routes/ui/grid.py",
line 201, in grid_data
fill_task_instance_summaries(
File
"/opt/airflow/airflow-core/src/airflow/api_fastapi/core_api/services/ui/grid.py",
line 233, in fill_task_instance_summaries
task_count=_get_total_task_count(run_id,
task_node_map[task_id]["task_count"], session),
File
"/opt/airflow/airflow-core/src/airflow/api_fastapi/core_api/services/ui/grid.py",
line 135, in _get_total_task_count
return sum(
File
"/opt/airflow/airflow-core/src/airflow/api_fastapi/core_api/services/ui/grid.py",
line 139, in <genexpr>
DBBaseOperator.get_mapped_ti_count(node, run_id=run_id, session=session)
or 0
File "/usr/local/lib/python3.9/functools.py", line 938, in _method
return method.__get__(obj, cls)(*args, **kwargs)
File "/opt/airflow/airflow-core/src/airflow/models/baseoperator.py", line
709, in _
current_count = exp_input.get_total_map_length(run_id, session=session)
File "/opt/airflow/airflow-core/src/airflow/models/expandinput.py", line
109, in get_total_map_length
lengths = self._get_map_lengths(run_id, session=session)
File "/opt/airflow/airflow-core/src/airflow/models/expandinput.py", line
103, in _get_map_lengths
raise NotFullyPopulated(set(self.value).difference(map_lengths))
airflow.sdk.definitions._internal.expandinput.NotFullyPopulated: Failed to
populate all mapping metadata; missing: 'num'
```
### What you think should happen instead?
_No response_
### How to reproduce
1. Try running below DAG and check API server logs
```
from airflow.decorators import dag, task
@dag()
def simple_dynamic_task_mapping_new():
@task
def get_nums():
return [1, 2, 3] # A
@task
def times_3(num): # B
return num * 2
_get_nums = get_nums()
_times_2 = times_3.expand(num=_get_nums) # D
simple_dynamic_task_mapping_new()
```
### Operating System
linux
### Versions of Apache Airflow Providers
_No response_
### Deployment
Official Apache Airflow Helm Chart
### Deployment details
_No response_
### Anything else?
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [x] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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