amoghrajesh opened a new pull request, #69607:
URL: https://github.com/apache/airflow/pull/69607
…hods
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### What
`ResumableJobMixin`'s six subclass-facing methods (`submit_job`,
`get_job_status`, `is_job_active`, `is_job_succeeded`, `poll_until_complete`,
`get_job_result`) are the entire contract a subclass must fulfill to get
crash-safe execution. Today, if an implementer forgets to override one, the
class still constructs fine and the mistake only surfaces as a
`NotImplementedError` the first time that specific method is actually called,
which can be much later than when the operator was defined.
### Current behaviour
A subclass missing, say, `get_job_result` instantiates without complaint.
The gap is invisible until a task actually reaches that code path, which for
methods like `poll_until_complete`'s reconnect branch might only happen after a
real worker crash in production, long after the operator shipped.
### Proposed change
`ResumableJobMixin` now inherits from `ABC` and decorates all six methods
with `@abstractmethod`. `BaseOperatorMeta` (the metaclass every `BaseOperator`
subclass already uses) already inherits from `ABCMeta`, so this composes with
`(ResumableJobMixin, BaseOperator)` with zero metaclass conflict.
### Why all six must be overridden
- The mixin has no reasonable default for any of them and each one is where
the subclass's specific external system (Databricks, Snowflake, etc.) actually
gets talked to, and `execute_resumable()`'s control flow calls all six
depending on which branch it takes (fresh submit, reconnect, already-succeeded,
terminal failure).
- A subclass that's missing even one of them isn't "mostly correct", it has
a hole in the exact contract this mixin exists to provide, and today that hole
is silent until runtime. Marking them abstract moves the failure from "the
first time this specific code path executes, maybe in production during an
actual crash" to "the moment the class is defined," which is a strictly better
place to catch it, a missing override bug should fail at parse/import time, not
lie dormant until an operator's least-tested branch (e.g. reconnect-on-crash)
finally runs for real.
### User implications / backcompat
- No behavior change for any correctly-implemented subclass such as
`DatabricksSubmitRunOperator`, `DatabricksRunNowOperator`, and
`SparkSubmitOperator` (all currently shipped) already override every one of the
six methods, so nothing changes for them; overriding an abstract method works
identically to overriding a regular one.
---
* Read the **[Pull Request
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for more information. Note: commit author/co-author name and email in commits
become permanently public when merged.
* For fundamental code changes, an Airflow Improvement Proposal
([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvement+Proposals))
is needed.
* When adding dependency, check compliance with the [ASF 3rd Party License
Policy](https://www.apache.org/legal/resolved.html#category-x).
* For significant user-facing changes create newsfragment:
`{pr_number}.significant.rst`, in
[airflow-core/newsfragments](https://github.com/apache/airflow/tree/main/airflow-core/newsfragments).
You can add this file in a follow-up commit after the PR is created so you
know the PR number.
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