Kafka: There are under replicated partitions

回答: 当Kafka集群中出现"under replicated partitions"的情况时，意味着一些分区的主副本不一致。这可能是由于某个节点宕机导致的，宕机期间该节点上的leader partition失联，导致大量的分区变为under replicated partitions。\[2\]在集群恢复过程中，通过重新选举leader partition，这些offline partition的数量会迅速减少甚至消失。因此，当发现有under replicated partitions时，需要确认集群中的节点是否正常运行，并确保leader partition重新选举以恢复分区的一致性。
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