↓ 2 callersMethodemitOneMessagePerPartitionThenRevokeOnePartition(KafkaSpout<String, String> spout, TopicPartition partitionThatWillBeRevoked, TopicPartition assignedPartition
external/storm-kafka-client/src/test/java/org/apache/storm/kafka/spout/KafkaSpoutRebalanceTest.java:100