Github user abhishekagarwal87 commented on the pull request:
https://github.com/apache/storm/pull/1132#issuecomment-187592967
https://github.com/apache/storm/blob/master/external/storm-kafka/src/jvm/org/apache/storm/kafka/KafkaUtils.java#L250
You can add the partitions to GlobalPartitionInfo even if leader is -1.
That way, it is ensured that all tasks have the same view of partitions.
PartitionManager for unassigned leaders can be just inactive and do nothing.
FYI That may make the changes a bit more complex.
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