lindong28 opened a new pull request, #22929:
URL: https://github.com/apache/flink/pull/22929
## What is the purpose of the change
Currently, if user uses a non-static member class in DataStream job, the job
might fail with the following error:
```
Caused by: org.apache.flink.streaming.runtime.tasks.StreamTaskException:
Could not serialize object for key serializedUDF.
at
org.apache.flink.streaming.api.graph.StreamConfig.lambda$serializeAllConfigs$1(StreamConfig.java:198)
at java.base/java.util.HashMap.forEach(HashMap.java:1337)
at
org.apache.flink.streaming.api.graph.StreamConfig.serializeAllConfigs(StreamConfig.java:192)
at
org.apache.flink.streaming.api.graph.StreamConfig.lambda$triggerSerializationAndReturnFuture$0(StreamConfig.java:169)
at
java.base/java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:714)
at
java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
```
The issue can typically be fixed by cleaning the class closure using
`StreamExecutionEnvironment#clean`. However, it is not easy to know the
solution and users can get stuck on this issue.
## Brief change log
Updated the error message in StreamConfig#serializeAllConfigs to suggest
using StreamExecutionEnvironment#clean.
## Verifying this change
Run a DataStream job that uses a non-static member class and verified that
the error message has been updated.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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