Kafka常用排查命令

# Kafka常用排查命令
Kafka有新旧Consumer Api之分，旧的ConsumerApi提交的组信息及offset是存放在zookeeper中的，
而由于zookeeper并不适合频繁的大批量写入操作，所以在新的ConsumerApi的设计中，
新建了一个`__consumer_offsets`Topic用于存放新ConsumerApi提交的组信息及offset。

所以现在有了新旧Api之分，旧的提交上来的还是存在zookeeper中。
kafka提供的工具脚本中和Consumer相碰的都有个选项`--new-consumer`,
用以区分新旧Api。

### 查看所有组信息
```bash
# 新版
./kafka-consumer-groups.sh --list --bootstrap-server xxx:9092 --new-consumer
newgrp

# 旧版
./kafka-consumer-groups.sh --list --zookeeper xxx:2181
console-consumer-54503
console-consumer-27065
console-consumer-1686
```

### 查看指定组的偏移信息
```bash
# 新版
 ./kafka-consumer-groups.sh --describe --bootstrap-server xxx:9092 --new-consumer --group newgrp
GROUP                          TOPIC                          PARTITION  CURRENT-OFFSET  LOG-END-OFFSET  LAG             OWNER
newgrp                         topicname                       0          40054927        40054927        0               consumer-1_/10.28.38.222
newgrp                         topicname                       1          43599415        43599415        0               consumer-1_/10.28.38.222
newgrp                         topicname                       2          40092386        40092386        0               consumer-1_/10.28.38.222
newgrp                         topicname                       3          42575063        42575063        0               consumer-1_/10.28.38.222
newgrp                         topicname                       4          40138115        40138115        0               consumer-1_/10.28.38.222

# 旧版
./kafka-consumer-groups.sh --describe --zookeeper datacenter-test-1:2181 --group console-consumer-1686
```

### 查看Topic的分布情况
```
./kafka-topics.sh --describe --zookeeper datecenter1:2181 --topic userAction
Topic:userAction	PartitionCount:12	ReplicationFactor:1	Configs:
	Topic: userAction	Partition: 0	Leader: 0	Replicas: 0	Isr: 0
	Topic: userAction	Partition: 1	Leader: 1	Replicas: 1	Isr: 1
	Topic: userAction	Partition: 2	Leader: 2	Replicas: 2	Isr: 2
	Topic: userAction	Partition: 3	Leader: 3	Replicas: 3	Isr: 3
	Topic: userAction	Partition: 4	Leader: 0	Replicas: 0	Isr: 0
	Topic: userAction	Partition: 5	Leader: 1	Replicas: 1	Isr: 1
	Topic: userAction	Partition: 6	Leader: 2	Replicas: 2	Isr: 2
	Topic: userAction	Partition: 7	Leader: 3	Replicas: 3	Isr: 3
	Topic: userAction	Partition: 8	Leader: 0	Replicas: 0	Isr: 0
	Topic: userAction	Partition: 9	Leader: 1	Replicas: 1	Isr: 1
	Topic: userAction	Partition: 10	Leader: 2	Replicas: 2	Isr: 2
	Topic: userAction	Partition: 11	Leader: 3	Replicas: 3	Isr: 3
```

** 旧版类似，后面只讨论新版的用法**
### 删除偏移信息
```bash
# 删除指定组的所有offset信息
./kafka-consumer-groups.sh --delete --bootstrap-server datacenter-test-1:9092 --new-consumer --group group1 --group group2

# 删除指定topic的所有组的offset信息
./kafka-consumer-groups.sh --delete --bootstrap-server datacenter-test-1:9092 --new-consumer --topic topicname

# 删除指定topic下指定组的offset信息
./kafka-consumer-groups.sh --delete --bootstrap-server datacenter-test-1:9092 --new-consumer --topic topicname --group group1
```

### 查看__consumer_offsets Topic内容
```bash
# 在0.10版本以后的版本，formatter使用kafka.coordinator.group.GroupMetadataManager\$OffsetsMessageFormatter
./kafka-console-consumer.sh --bootstrap-server datecenter6:9092 --new-consumer --topic __consumer_offsets --formatter "kafka.coordinator.GroupMetadataManager\$OffsetsMessageFormatter"
```

## 参考
[Kafka 如何读取offset topic内容 (__consumer_offsets)](http://www.cnblogs.com/huxi2b/p/6061110.html)

阿川CH