Github user srdo commented on a diff in the pull request: https://github.com/apache/storm/pull/2147#discussion_r119449375 --- Diff: external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/KafkaSpout.java --- @@ -170,10 +182,13 @@ private void initialize(Collection<TopicPartition> partitions) { final long fetchOffset = doSeek(tp, committedOffset); setAcked(tp, fetchOffset); } - initialized = true; + + task.start(); --- End diff -- Huh, you're right. Learn something every day :) We already have manual assignment implementations ready to go [here](https://github.com/apache/storm/blob/master/external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/ManualPartitionNamedSubscription.java) and [here](https://github.com/apache/storm/blob/master/external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/ManualPartitionPatternSubscription.java), the user just has to configure the spout to use them with one of these builders https://github.com/apache/storm/blob/master/external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/KafkaSpoutConfig.java#L136
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