1996fanrui opened a new pull request, #28168:
URL: https://github.com/apache/flink/pull/28168
## What is the purpose of the change
`StateBackendTestBase#testMapStateWithNullValue` creates a
`CheckpointableKeyedStateBackend` via `createKeyedBackend(...)` but never
closes/disposes it, leaking the resources held by the backend. Every other test
in this file already wraps the body in `try { ... } finally {
IOUtils.closeQuietly(backend); backend.dispose(); }`; this one was missed when
it was added in FLINK-38137.
For most of the existing state backends covered by this suite the leak is
harmless (Heap holds no OS resources; RocksDB's compaction threads end with the
JVM), but for any state backend that owns long-lived background tasks polling
remote state (e.g. cloud-native backends that periodically read a remote
manifest), the leaked backend keeps file handles open under the static
`@TempDir` and races the class teardown when JUnit deletes that directory —
surfacing as `Failed to delete temp directory ...` plus the backend reporting
errors on the now-missing files. Adding the missing cleanup eliminates this
category of failure outside Flink as well.
## Brief change log
- Wrap the body of `testMapStateWithNullValue` in a `try { ... } finally {
IOUtils.closeQuietly(keyedBackend); keyedBackend.dispose(); }` block, matching
the cleanup pattern used by every other test in `StateBackendTestBase`.
## Verifying this change
This change is a test-side resource cleanup with no behavior change for
production code paths. It can be verified by running `StateBackendTestBase` and
its existing implementations and observing that no test logic is affected.
## 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: **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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