rainerschamm opened a new issue, #17349:
URL: https://github.com/apache/iceberg/issues/17349
### Apache Iceberg version
1.11.0 (latest release)
### Query engine
None
### Please describe the bug 🐞
We have repeatedly witnessed a phantom consumer being left behind after
stopping a connector.
For example:
```
GROUP TOPIC
PARTITION CURRENT-OFFSET LOG-END-OFFSET LAG CONSUMER-ID
HOST CLIENT-ID
connect-dbz-iceberg-xxx-coord iceberg-control-topic 0 2392395
2392398 3
7b6c3837-5f3b-4257-87b8-fba8e28c29d7-edc2df8b-1ec3-4217-9cf8-7ab210f9102e
/10.104.165.73 7b6c3837-5f3b-4257-87b8-fba8e28c29d7
```
We are currently running a slightly patched CommitterImpl.java, which seems
to fix the issue:
```java
private void stopCoordinator() {
if (coordinatorThread != null) {
coordinatorThread.terminate();
+ try {
+ LOG.info("Asking coordinator thread to join for task {}", taskId);
+ coordinatorThread.join(30000);
+ LOG.info("Coordinator thread joined for task {}", taskId);
+ } catch (InterruptedException e) {
+ LOG.warn("Coordinator thread join interrupted for task {}", taskId,
e);
+ }
coordinatorThread = null;
}
}
```
This gives the CoordniatorThread:run() method a proper chance to finish and
close resources:
```java
@Override
public void run() {
...
try {
LOG.info("Stopping coordinator");
coordinator.stop();
} catch (Exception e) {
LOG.error("Coordinator error during stop, ignoring", e);
}
}
```
The Channel:stop() method:
```
void stop() {
LOG.info("Channel stopping");
producer.close();
consumer.close();
admin.close();
}
```
### Willingness to contribute
- [ ] I can contribute a fix for this bug independently
- [ ] I would be willing to contribute a fix for this bug with guidance from
the Iceberg community
- [ ] I cannot contribute a fix for this bug at this time
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