Kafka Tools
参考，
https://cwiki.apache.org/confluence/display/KAFKA/System+Tools
https://cwiki.apache.org/confluence/display/KAFKA/Replication+tools
http://kafka.apache.org/documentation.html#quickstart
http://kafka.apache.org/documentation.html#operations
为了便于使用，kafka提供了比较强大的Tools，把经常需要使用的整理一下
开关kafka Server
bin/kafka-server-start.sh config/server.properties bin/kafka-server-stop.sh JMX_PORT=9999 nohup bin/kafka-server-start.sh config/server.properties &
topic相关
bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test bin/kafka-topics.sh --list --zookeeper localhost:2181
describe topic的详细情况
bin/kafka-topics.sh --describe --zookeeper localhost:2181 --topic test
修改topic的partition，只能增加
bin/kafka-topics.sh --alter --zookeeper localhost:2181 --partitions 3 --topic test
到0.8.2才正式支持删除topic，当前是beta版
/usr/local/rds/kafka/bin/kafka-topics.sh --delete --topic topic_name --zookeeper localhost:2181
注意在配置里面，delete.topic.enable=true
查看有问题的partition
bin/kafka-topics.sh --describe --zookeeper localhost:2181 --unavailable-partitions --topic test
per-topic 修改参数
> bin/kafka-topics.sh --zookeeper localhost:2181 --create --topic my-topic --partitions 1
--replication-factor 1 --config max.message.bytes=64000 --config flush.messages=1
> bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic my-topic
--config max.message.bytes=128000
> bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic my-topic
--deleteConfig max.message.bytes
集群扩展
集群扩展，对于broker还是比较简单的，但是现有的topic上的partition是不会做自动迁移的
需要手工做迁移，但kafka提供了比较方便的工具，
--generate，生成参考的迁移计划
given a list of topics and a list of brokers，工具会给出迁徙方案
把topic完全迁移到新的brokers
> cat topics-to-move.json
{"topics": [{"topic": "foo1"},
{"topic": "foo2"}],
"version":1
}
> bin/kafka-reassign-partitions.sh --zookeeper localhost:2181 --topics-to-move-json-file topics-to-move.json --broker-list "5,6" --generate
Current partition replica assignment
{"version":1,
"partitions":[{"topic":"foo1","partition":2,"replicas":[1,2]},
{"topic":"foo1","partition":0,"replicas":[3,4]},
{"topic":"foo2","partition":2,"replicas":[1,2]},
{"topic":"foo2","partition":0,"replicas":[3,4]},
{"topic":"foo1","partition":1,"replicas":[2,3]},
{"topic":"foo2","partition":1,"replicas":[2,3]}]
}
Proposed partition reassignment configuration
{"version":1,
"partitions":[{"topic":"foo1","partition":2,"replicas":[5,6]},
{"topic":"foo1","partition":0,"replicas":[5,6]},
{"topic":"foo2","partition":2,"replicas":[5,6]},
{"topic":"foo2","partition":0,"replicas":[5,6]},
{"topic":"foo1","partition":1,"replicas":[5,6]},
{"topic":"foo2","partition":1,"replicas":[5,6]}]
}
给出当前的assignment情况和，迁移方案
我们可以同时保存当前的assignment情况和迁移方案，当前的assignment情况可以用于rollback
--execute，开始执行迁移
> bin/kafka-reassign-partitions.sh --zookeeper localhost:2181 --reassignment-json-file expand-cluster-reassignment.json --execute
Current partition replica assignment
{"version":1,
"partitions":[{"topic":"foo1","partition":2,"replicas":[1,2]},
{"topic":"foo1","partition":0,"replicas":[3,4]},
{"topic":"foo2","partition":2,"replicas":[1,2]},
{"topic":"foo2","partition":0,"replicas":[3,4]},
{"topic":"foo1","partition":1,"replicas":[2,3]},
{"topic":"foo2","partition":1,"replicas":[2,3]}]
}
Save this to use as the --reassignment-json-file option during rollback
Successfully started reassignment of partitions
{"version":1,
"partitions":[{"topic":"foo1","partition":2,"replicas":[5,6]},
{"topic":"foo1","partition":0,"replicas":[5,6]},
{"topic":"foo2","partition":2,"replicas":[5,6]},
{"topic":"foo2","partition":0,"replicas":[5,6]},
{"topic":"foo1","partition":1,"replicas":[5,6]},
{"topic":"foo2","partition":1,"replicas":[5,6]}]
}
--verify，check当前的迁移状态
> bin/kafka-reassign-partitions.sh --zookeeper localhost:2181 --reassignment-json-file expand-cluster-reassignment.json --verify Status of partition reassignment: Reassignment of partition [foo1,0] completed successfully Reassignment of partition [foo1,1] is in progress Reassignment of partition [foo1,2] is in progress Reassignment of partition [foo2,0] completed successfully Reassignment of partition [foo2,1] completed successfully Reassignment of partition [foo2,2] completed successfully
选择topic的某个partition的某些replica进行迁徙
moves partition 0 of topic foo1 to brokers 5,6 and partition 1 of topic foo2 to brokers 2,3
> cat custom-reassignment.json
{"version":1,"partitions":[{"topic":"foo1","partition":0,"replicas":[5,6]},{"topic":"foo2","partition":1,"replicas":[2,3]}]}
> bin/kafka-reassign-partitions.sh --zookeeper localhost:2181 --reassignment-json-file custom-reassignment.json --execute
Current partition replica assignment
{"version":1,
"partitions":[{"topic":"foo1","partition":0,"replicas":[1,2]},
{"topic":"foo2","partition":1,"replicas":[3,4]}]
}
Save this to use as the --reassignment-json-file option during rollback
Successfully started reassignment of partitions
{"version":1,
"partitions":[{"topic":"foo1","partition":0,"replicas":[5,6]},
{"topic":"foo2","partition":1,"replicas":[2,3]}]
}
brokers下线
当前版本不支持下线的规划，需要到0.8.2才支持，这需要把一个broker上的replica清空
增加replication factor
partition 0的replica数从1增长到3，当前replica存在broker5，在broker6，7上增加replica
> cat increase-replication-factor.json
{"version":1,
"partitions":[{"topic":"foo","partition":0,"replicas":[5,6,7]}]}
> bin/kafka-reassign-partitions.sh --zookeeper localhost:2181 --reassignment-json-file increase-replication-factor.json --execute
Current partition replica assignment
{"version":1,
"partitions":[{"topic":"foo","partition":0,"replicas":[5]}]}
Save this to use as the --reassignment-json-file option during rollback
Successfully started reassignment of partitions
{"version":1,
"partitions":[{"topic":"foo","partition":0,"replicas":[5,6,7]}]}
Producer console
> bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test This is a message This is another message
后面可以任意的输入message，都会发到broker的topic中
Comsumer console
bin/kafka-console-consumer.sh --zookeeper localhost:2181 --topic test --from-beginning
从头读这个topic，可以重复读到所有数据
我在想为啥，每次都能replay，原来每次都是随机产生一个groupid
consumerProps.put("group.id","console-consumer-" + new Random().nextInt(100000))
Consumer Offset Checker
这个会显示出consumer group的offset情况， 必须参数为--group， 不指定--topic，默认为所有topic
Displays the: Consumer Group, Topic, Partitions, Offset, logSize, Lag, Owner for the specified set of Topics and Consumer Group
bin/kafka-run-class.sh kafka.tools.ConsumerOffsetChecker
required argument: [group]
Option Description
------ -----------
--broker-info Print broker info
--group Consumer group.
--help Print this message.
--topic Comma-separated list of consumer
topics (all topics if absent).
--zkconnect ZooKeeper connect string. (default: localhost:2181)
Example,
bin/kafka-run-class.sh kafka.tools.ConsumerOffsetChecker --group pv
Group Topic Pid Offset logSize Lag Owner
pv page_visits 0 21 21 0 none
pv page_visits 1 19 19 0 none
pv page_visits 2 20 20 0 none
Export Zookeeper Offsets
将Zk中的offset信息以下面的形式打到file里面去
A utility that retrieves the offsets of broker partitions in ZK and prints to an output file in the following format:
/consumers/group1/offsets/topic1/1-0:286894308
/consumers/group1/offsets/topic1/2-0:284803985
bin/kafka-run-class.sh kafka.tools.ExportZkOffsets
required argument: [zkconnect]
Option Description
------ -----------
--group Consumer group.
--help Print this message.
--output-file Output file
--zkconnect ZooKeeper connect string. (default: localhost:2181)
Update Offsets In Zookeeper
这个挺有用，用于replay, kafka的文档有点坑爹，看了不知道咋用，还是看源码才看明白
A utility that updates the offset of every broker partition to the offset of earliest or latest log segment file, in ZK.
bin/kafka-run-class.sh kafka.tools.UpdateOffsetsInZK
USAGE: kafka.tools.UpdateOffsetsInZK$ [earliest | latest] consumer.properties topic
Example，
bin/kafka-run-class.sh kafka.tools.UpdateOffsetsInZK earliest config/consumer.properties page_visits
Group Topic Pid Offset logSize Lag Owner
pv page_visits 0 0 21 21 none
pv page_visits 1 0 19 19 none
pv page_visits 2 0 20 20 none
可以看到offset已经被清0，Lag=logSize
更加直接的方式是，直接去Zookeeper里面看
通过zkCli.sh连上后，通过ls查看
Broker Node Registry
/brokers/ids/[0...N] --> host:port (ephemeral node)
Broker Topic Registry
/brokers/topics/[topic]/[0...N] --> nPartions (ephemeral node)
Consumer Id Registry
/consumers/[group_id]/ids/[consumer_id] --> {"topic1": #streams, ..., "topicN": #streams} (ephemeral node)
Consumer Offset Tracking
/consumers/[group_id]/offsets/[topic]/[broker_id-partition_id] --> offset_counter_value ((persistent node)
Partition Owner registry
/consumers/[group_id]/owners/[topic]/[broker_id-partition_id] --> consumer_node_id (ephemeral node)
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