johnnychhsu opened a new pull request, #15550:
URL: https://github.com/apache/kafka/pull/15550
## Context
In KafkaMetirc.java, the config getter is
```
@Override
public MetricName metricName()
{ return this.metricName; }
```
and there is a setter
```
public void config(MetricConfig config) {
synchronized (lock) {
this.config = config;
}
}
```
Since it's possible to set and get in the mean time, we should have lock in
the getter as well
Refer to [KAFKA-16381](https://issues.apache.org/jira/browse/KAFKA-16381).
## Solution
Add the lock in the config getter
## Test
```
./gradlew cleanTest core:test --tests ConnectionQuotasTest --tests
ControllerMutationQuotaTest stream:test --tests StandbyTaskTest --tests
StreamTaskTest
```
and it passed
### Committer Checklist (excluded from commit message)
- [ ] Verify design and implementation
- [ ] Verify test coverage and CI build status
- [ ] Verify documentation (including upgrade notes)
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