Comment 1 for bug 1888522

Example of how a 1 in 3 node failure could look (and the cluster should keep on working).

```
(kafka)[kafka@control02 /opt/kafka/bin]$ ./kafka-topics.sh --describe --zookeeper localhost --topic metrics
Topic:metrics PartitionCount:30 ReplicationFactor:2 Configs:
        Topic: metrics Partition: 0 Leader: 1002 Replicas: 1002,1003 Isr: 1002
        Topic: metrics Partition: 1 Leader: 1001 Replicas: 1003,1001 Isr: 1001
        Topic: metrics Partition: 2 Leader: 1001 Replicas: 1001,1002 Isr: 1001,1002
        Topic: metrics Partition: 3 Leader: 1002 Replicas: 1002,1001 Isr: 1002,1001
        Topic: metrics Partition: 4 Leader: 1002 Replicas: 1003,1002 Isr: 1002
        Topic: metrics Partition: 5 Leader: 1001 Replicas: 1001,1003 Isr: 1001
        Topic: metrics Partition: 6 Leader: 1002 Replicas: 1002,1003 Isr: 1002
        Topic: metrics Partition: 7 Leader: 1001 Replicas: 1003,1001 Isr: 1001
        Topic: metrics Partition: 8 Leader: 1001 Replicas: 1001,1002 Isr: 1001,1002
        Topic: metrics Partition: 9 Leader: 1002 Replicas: 1002,1001 Isr: 1002,1001
        Topic: metrics Partition: 10 Leader: 1002 Replicas: 1003,1002 Isr: 1002
        Topic: metrics Partition: 11 Leader: 1001 Replicas: 1001,1003 Isr: 1001
        Topic: metrics Partition: 12 Leader: 1002 Replicas: 1002,1003 Isr: 1002
        Topic: metrics Partition: 13 Leader: 1001 Replicas: 1003,1001 Isr: 1001
        Topic: metrics Partition: 14 Leader: 1001 Replicas: 1001,1002 Isr: 1001,1002
        Topic: metrics Partition: 15 Leader: 1002 Replicas: 1002,1001 Isr: 1002,1001
        Topic: metrics Partition: 16 Leader: 1002 Replicas: 1003,1002 Isr: 1002
        Topic: metrics Partition: 17 Leader: 1001 Replicas: 1001,1003 Isr: 1001
        Topic: metrics Partition: 18 Leader: 1002 Replicas: 1002,1003 Isr: 1002
        Topic: metrics Partition: 19 Leader: 1001 Replicas: 1003,1001 Isr: 1001
        Topic: metrics Partition: 20 Leader: 1001 Replicas: 1001,1002 Isr: 1001,1002
        Topic: metrics Partition: 21 Leader: 1002 Replicas: 1002,1001 Isr: 1002,1001
        Topic: metrics Partition: 22 Leader: 1002 Replicas: 1003,1002 Isr: 1002
        Topic: metrics Partition: 23 Leader: 1001 Replicas: 1001,1003 Isr: 1001
        Topic: metrics Partition: 24 Leader: 1002 Replicas: 1002,1003 Isr: 1002
        Topic: metrics Partition: 25 Leader: 1001 Replicas: 1003,1001 Isr: 1001
        Topic: metrics Partition: 26 Leader: 1001 Replicas: 1001,1002 Isr: 1001,1002
        Topic: metrics Partition: 27 Leader: 1002 Replicas: 1002,1001 Isr: 1002,1001
        Topic: metrics Partition: 28 Leader: 1002 Replicas: 1003,1002 Isr: 1002
        Topic: metrics Partition: 29 Leader: 1001 Replicas: 1001,1003 Isr: 1001
```