liuml07 opened a new pull request, #26776:
URL: https://github.com/apache/flink/pull/26776
This is a revised version of the previous closed PR #24205
## What is the purpose of the change
Currently the ClosureCleaner throws exception if {{checkSerializable} is
enabled while some object is non-serializable. It includes the non-serializable
(nested) object in the exception in the exception message.
However, when the user job program gets more complex pulling multiple
operators each of which pulls multiple 3rd party libraries, it is unclear how
the non-serializable object is referenced as some of those objects could be
nested in multiple levels. For example, following exception is not
straightforward where to check:
```
org.apache.flink.api.common.InvalidProgramException:
java.lang.Object@528c868 is not serializable.
```
It would be nice to include the reference stack in the exception message, as
following:
```
org.apache.flink.api.common.InvalidProgramException:
java.lang.Object@72437d8d is not serializable.
Referenced via [com.mycompany.myapp.ComplexMap ->
com.mycompany.myapp.LocalMap ->
com.yourcompany.yourapp.YourPojo -> com.hercompany.herapp.Random ->
java.lang.Object]
```
## Verifying this change
This change is largely covered by existing tests, and new test case was
added to `ClosureCleanerTest`.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't
know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (**not applicable** / docs /
JavaDocs / not documented)
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