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Status
Current state: Under Discussion
Discussion thread:
JIRA:
Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).
Motivation
This is a proposal for an admin tool - say, kafka-brokers.sh to provide broker related useful information. Some of the key factors for Kafka's success are its performant architecture and operational simplicity. This is further complemented with a set of commandline tools and utilities for managing topics as well as testing/stress-testing. However currently Kafka lacks commands/tools to get cluster and broker overview. Although it should be mentioned that Kafka does expose cluster information via API and broker metrics via JMX.
Public Interfaces
The kafka-broker.sh command is modeled after the kafka-topic.sh and has the following options:
--zookeeper <zookeeper,port> : zookeeper URL
--rack <list of comma-seperated racks>: filter details on brokers in the list of racks only
-- topic <list of comma-seperated topcis>: : filter details on brokers that serve partitions for the provided topic
Proposed Changes
The command will essentially provide the following pieces of information:
Broker Information
- Broker Id
- Hostname
- Rack
- Endpoints
- Topic count (i.e. how many topics are hosted by the broker)
- All partition count (i.e. how many partition replicas are hosted by the broker)
- Leader partition count (i.e. how many leader partitions are hosted by the broker)
- Insync partition count (i.e, how many follower partitions are insync)
- Under-replicated partition count (i.e. how many partitions are not insync)
- An asterisk would indicate that the broker is the leader for that partition.
With commandline options, topic names and partition numbers can be enumerated.
Command Options
The command kafka-brokers.sh requires zookeeper information and additional accepts other options as show below:
$ ./kafka-brokers.sh Missing required argument "[zookeeper]" Option Description ------ ----------- --broker <Integer: broker-id> Filter for a broker. Option can be used multiple times for multiple broker-ids --details if specified, shows detailed listing of topics and partitions --host <hostname> Filter for a hostname. Option can be used multiple times for multiple hostnames --partition-details if specified, shows partitions in each topic --rack <rack> Filter for a rack. Option can be used multiple times for multiple racks --topic <topic> Filter for a topic. Option can be used multiple times for multiple topics --topic-details if specified, shows topics and partition counts in each topic --zookeeper <zkurl> REQUIRED: The connection string for zookeeper(s) in the form host:port, host:port/zkchroot or host1,host2, host3:port/zkchroot.
The options "–broker", "–host", "–rack" and "–topic" provide filtering for the specified broker (broker-id), host, rack or topic. Each of the options can be specified multiple times. The option "--topic-details" makes the command to enumerate all the topic names in addition to giving the topic count. The option "--partition-details" makes the command to enumerate all the partitions for each topic. The partitions have an an optional prefix of "+" or "-" to indicate that the partition is a leader partition or an under-replicated partition respectively. An insync replica partition will not have any prefix.
Here are examples usages of the command.
$ ./kafka-brokers.sh --zookeeper zk1,zk2,zk3:2181 BrokerId: 1 Hostname: host1 Rack: rack1 Endpoints: (host1,9092,PLAINTEXT), (host1,9093,SSL) Topics: 2 Partitions: 12 Leaders: 4 InSync: 8 Trailing: 0 BrokerId: 2 Hostname: host2 Rack: rack2 Endpoints: (host2,9092,PLAINTEXT), (host2,9093,SSL) Topics: 2 Partitions: 12 Leaders: 4 InSync: 8 Trailing: 0 BrokerId: 3 Hostname: host3 Rack: rack3 Endpoints: (host3,9092,PLAINTEXT), (host3,9093,SSL) Topics: 2 Partitions: 12 Leaders: 4 InSync: 8 Trailing: 0
BrokerId: 1 Hostname: host1 Rack: rack1 Endpoints: (host1,9092,PLAINTEXT), (host1,9093,SSL) Topics: 2 Partitions: 12 Leaders: 4 InSync: 8 Trailing: 0 Topic Details: topic2 with 6 partitions, topic1 with 6 partitions BrokerId: 2 Hostname: host2 Rack: rack2 Endpoints: (host2,9092,PLAINTEXT), (host2,9093,SSL) Topics: 2 Partitions: 12 Leaders: 4 InSync: 8 Trailing: 0 Topic Details: topic2 with 6 partitions, topic1 with 6 partitions BrokerId: 3 Hostname: host3 Rack: rack3 Endpoints: (host3,9092,PLAINTEXT), (host3,9093,SSL) Topics: 2 Partitions: 12 Leaders: 4 InSync: 8 Trailing: 0 Topic Details: topic2 with 6 partitions, topic1 with 6 partitions
BrokerId: 1 Hostname: host1 Rack: rack1 Endpoints: (host1,9092,PLAINTEXT), (host1,9093,SSL) Topics: 2 Partitions: 12 Leaders: 4 InSync: 8 Trailing: 0 Partition Details: (topic2: 5,4,+3,2,1,+0), (topic1: 5,4,+3,2,1,+0) BrokerId: 2 Hostname: host2 Rack: rack2 Endpoints: (host2,9092,PLAINTEXT), (host2,9093,SSL) Topics: 2 Partitions: 12 Leaders: 4 InSync: 8 Trailing: 0 Partition Details: (topic2: 5,+4,3,2,+1,0), (topic1: 5,+4,3,2,+1,0) BrokerId: 3 Hostname: host3 Rack: rack3 Endpoints: (host3,9092,PLAINTEXT), (host3,9093,SSL) Topics: 2 Partitions: 12 Leaders: 4 InSync: 8 Trailing: 0 Partition Details: (topic2: +5,4,3,+2,1,0), (topic1: +5,4,3,+2,1,0)
BrokerId: 1 Hostname: host1 Rack: rack1 Endpoints: (host1,9092,PLAINTEXT), (host1,9093,SSL) Topics: 2 Partitions: 12 Leaders: 4 InSync: 8 Trailing: 0 Topic Details: topic2 with 6 partitions, topic1 with 6 partitions Partition Details: (topic2: 5,4,+3,2,1,+0), (topic1: 5,4,+3,2,1,+0) BrokerId: 2 Hostname: host2 Rack: rack2 Endpoints: (host2,9092,PLAINTEXT), (host2,9093,SSL) Topics: 2 Partitions: 12 Leaders: 4 InSync: 8 Trailing: 0 Topic Details: topic2 with 6 partitions, topic1 with 6 partitions Partition Details: (topic2: 5,+4,3,2,+1,0), (topic1: 5,+4,3,2,+1,0) BrokerId: 3 Hostname: host3 Rack: rack3 Endpoints: (host3,9092,PLAINTEXT), (host3,9093,SSL) Topics: 2 Partitions: 12 Leaders: 4 InSync: 8 Trailing: 0 Topic Details: topic2 with 6 partitions, topic1 with 6 partitions Partition Details: (topic2: +5,4,3,+2,1,0), (topic1: +5,4,3,+2,1,0)
Compatibility, Deprecation, and Migration Plan
None yet.
Rejected Alternatives
If there are alternative ways of accomplishing the same thing, what were they? The purpose of this section is to motivate why the design is the way it is and not some other way.