scimas commented on issue #8605:
URL: https://github.com/apache/druid/issues/8605#issuecomment-820717034
I encountered the same problem. The cause seems have been some inconsistency
with the metadata. Fortunately this happened in testing and was solvable by a
hard reset of the supervisor.
```
2021-04-15T20:05:08,573 ERROR [qtp398777435-101]
org.apache.druid.metadata.IndexerSQLMetadataStorageCoordinator - Not updating
metadata, existing
state[KafkaDataSourceMetadata{SeekableStreamStartSequenceNumbers=SeekableStreamEndSequenceNumbers{stream='redacted-topic-name',
partitionSequenceNumberMap={0=57933}}}] in metadata store doesn't match to the
new start
state[KafkaDataSourceMetadata{SeekableStreamStartSequenceNumbers=SeekableStreamStartSequenceNumbers{stream='redacted-topic-name',
partitionSequenceNumberMap={0=0}, exclusivePartitions=[]}}].
```
[This
comment](https://github.com/apache/druid/issues/8605#issuecomment-556283972)
led me to check the coordinator-overlord log and found this information. It
would be helpful if at least the error message in the task log could be
improved though. The current message doesn't point in any helpful direction for
further troubleshooting.
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