stevenzwu commented on issue #7020: [FLINK-10774] [Kafka] connection leak when partition discovery is disabled an… URL: https://github.com/apache/flink/pull/7020#issuecomment-438544127 we saw some exception regarding redundant calls to close method. will need to fix it. ``` 2018-11-13 18:26:54,928 ERROR org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase - failed to close partitionDiscoverer java.lang.IllegalStateException: This consumer has already been closed. at org.apache.kafka.clients.consumer.KafkaConsumer.ensureNotClosed(KafkaConsumer.java:1613) at org.apache.kafka.clients.consumer.KafkaConsumer.acquire(KafkaConsumer.java:1624) at org.apache.kafka.clients.consumer.KafkaConsumer.close(KafkaConsumer.java:1526) at org.apache.kafka.clients.consumer.KafkaConsumer.close(KafkaConsumer.java:1506) at org.apache.flink.streaming.connectors.kafka.internal.Kafka09PartitionDiscoverer.closeConnections(Kafka09PartitionDiscoverer.java:97) at org.apache.flink.streaming.connectors.kafka.internals.AbstractPartitionDiscoverer.close(AbstractPartitionDiscoverer.java:101) at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.cancel(FlinkKafkaConsumerBase.java:673) at org.apache.flink.streaming.api.operators.StreamSource.cancel(StreamSource.java:108) at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.cancelTask(SourceStreamTask.java:100) at org.apache.flink.streaming.runtime.tasks.StreamTask.cancel(StreamTask.java:369) at org.apache.flink.runtime.taskmanager.Task$TaskCanceler.run(Task.java:1481) at java.lang.Thread.run(Thread.java:748) ```
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