YoannAbriel opened a new pull request, #62932:
URL: https://github.com/apache/airflow/pull/62932
## Problem
When using remote logging in Airflow 3.x with `remote_task_handler_kwargs`
containing `FileTaskHandler` parameters like `max_bytes`, `backup_count`, or
`delay`, the application crashes on startup with:
```
TypeError: WasbRemoteLogIO.__init__() got an unexpected keyword argument
'max_bytes'
```
This is a regression from PR #48491 which introduced separate `RemoteLogIO`
classes for remote storage operations.
## Root Cause
In Airflow 2.x, `remote_task_handler_kwargs` configured the handler
directly. In Airflow 3.x, the same kwargs dict is passed entirely to
`RemoteLogIO` constructors (which only accept I/O-specific parameters like
`remote_base`, `base_log_folder`, `delete_local_copy`), and then the dict is
cleared to `{}`. This means:
1. Handler-level params (`max_bytes`, `backup_count`, `delay`) cause
`TypeError` in `RemoteLogIO.__init__`
2. Even if they didn't error, they'd be lost before reaching the handler
config update at the end
## Fix
Separate `remote_task_handler_kwargs` into two groups before processing:
- **Handler kwargs** (`max_bytes`, `backup_count`, `delay`) → preserved and
applied to `FileTaskHandler` config
- **Remote I/O kwargs** (everything else) → passed to `RemoteLogIO`
constructors
This restores backward compatibility with Airflow 2.x configuration while
working correctly with the new RemoteLogIO architecture.
Closes: #58770
---
##### Was generative AI tooling used to co-author this PR?
- [X] Yes — Claude Code
Generated-by: Claude Code following [the
guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#gen-ai-assisted-contributions)
---
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