AndrewJSchofield commented on PR #19443:
URL: https://github.com/apache/kafka/pull/19443#issuecomment-2812208506
When I delete the `__share_group_state` topic I get the following exception
information:
```
[2025-04-17 09:41:17,524] INFO [ShareCoordinator id=1] Pruning records in
__share_group_state-0 till offset 3.
(org.apache.kafka.coordinator.share.ShareCoordinatorService)
[2025-04-17 09:41:17,527] ERROR [ShareCoordinator id=1] Received error in
share-group state topic prune.
(org.apache.kafka.coordinator.share.ShareCoordinatorService)
java.util.concurrent.CompletionException:
org.apache.kafka.common.errors.UnknownTopicOrPartitionException: This server
does not host this topic-partition.
at
java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:332)
[?:?]
at
java.base/java.util.concurrent.CompletableFuture.andTree(CompletableFuture.java:1527)
[?:?]
at
java.base/java.util.concurrent.CompletableFuture.allOf(CompletableFuture.java:2419)
[?:?]
at
org.apache.kafka.coordinator.share.ShareCoordinatorService$1.run(ShareCoordinatorService.java:281)
[kafka-share-coordinator-4.1.0-SNAPSHOT.jar:?]
at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
[?:?]
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[?:?]
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
[?:?]
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
[?:?]
at java.base/java.lang.Thread.run(Thread.java:840) [?:?]
Caused by: org.apache.kafka.common.errors.UnknownTopicOrPartitionException:
This server does not host this topic-partition.
```
The background tasks perpetually throw exceptions in this situation, and I
suspect that a more orderly leadership change could similarly make the code
sad. While the coordinator runtime is properly able to handle unfortunate
leadership events, I think the error handling of the background tasks in the
share coordinator needs a little refinement.
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