Does anyone have a guess what might cause this exception?
java.lang.RuntimeException: Unable to find a leader for partitions: [FetchPartition {topic=usersignals, partition=1, offset=2825838}] at org.apache.flink.streaming.connectors.kafka.internals.LegacyFetcher.findLeaderForPartitions(LegacyFetcher.java:323) at org.apache.flink.streaming.connectors.kafka.internals.LegacyFetcher.run(LegacyFetcher.java:162) at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer08.run(FlinkKafkaConsumer08.java:316) at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:78) at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:56) at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:225) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559) at java.lang.Thread.run(Thread.java:745)