hachikuji commented on a change in pull request #10227: URL: https://github.com/apache/kafka/pull/10227#discussion_r592828096
########## File path: KIP-500.md ########## @@ -0,0 +1,131 @@ +KIP-500 Early Access Release +============================ + +# Introduction +It is now possible to run Apache Kafka without Apache ZooKeeper! We call this mode [self-managed mode](https://cwiki.apache.org/confluence/display/KAFKA/KIP-500%3A+Replace+ZooKeeper+with+a+Self-Managed+Metadata+Quorum). It is currently *EARLY ACCESS AND SHOULD NOT BE USED IN PRODUCTION*, but it is available for testing in the Kafka 2.8 release. + +When the Kafka cluster is in self-managed mode, it does not store its metadata in ZooKeeper. In fact, you do not have to run ZooKeeper at all, because it stores its metadata in a Raft quorum of controller nodes. + +Self-managed mode has many benefits -- some obvious, and some not so obvious. Clearly, it is nice to manage and configure one service rather than two services. In addition, you can now run a single process Kafka cluster. Most important of all, self-managed mode is more scalable. We expect to be able to [support many more topics and partitions](https://www.confluent.io/kafka-summit-san-francisco-2019/kafka-needs-no-keeper/) in this mode. + +# Quickstart + +## Warning +Self-managed mode in Kafka 2.8 is provided for testing only, *NOT* for production. We do not yet support upgrading existing ZooKeeper-based Kafka clusters into this mode. In fact, when Kafka 3.0 is released, it may not even be possible to upgrade your self-managed clusters from 2.8 to 3.0 without downtime. There may be bugs, including serious ones. You should *assume that your data could be lost at any time* if you try the early access release of KIP-500. + +## Generate a cluster ID +The first step is to generate an ID for your new cluster, using the kafka-storage tool: + +~~~~ +$ ./bin/kafka-storage.sh random-uuid +xtzWWN4bTjitpL3kfd9s5g +~~~~ + +## Format Storage Directories +The next step is to format your storage directories. If you are running in single-node mode, you can do this with one command: + +~~~~ +$ ./bin/kafka-storage.sh format -t xtzWWN4bTjitpL3kfd9s5g -c ./config/nozk-combined.properties +Formatting /tmp/nozk-combined-logs +~~~~ + +If you are using multiple nodes, then you should run the format command on each node. Be sure to use the same cluster ID for each one. + +## Start the Kafka Server +Finally, you are ready to start the Kafka server on each node. + +~~~~ +$ ./bin/kafka-server-start.sh ./config/nozk-combined.properties +[2021-02-26 15:37:11,071] INFO Registered kafka:type=kafka.Log4jController MBean (kafka.utils.Log4jControllerRegistration$) +[2021-02-26 15:37:11,294] INFO Setting -D jdk.tls.rejectClientInitiatedRenegotiation=true to disable client-initiated TLS renegotiation (org.apache.zookeeper.common.X509Util) +[2021-02-26 15:37:11,466] INFO [Log partition=@metadata-0, dir=/tmp/nozk-combined-logs] Loading producer state till offset 0 with message format version 2 (kafka.log.Log) +[2021-02-26 15:37:11,509] INFO [raft-expiration-reaper]: Starting (kafka.raft.TimingWheelExpirationService$ExpiredOperationReaper) +[2021-02-26 15:37:11,640] INFO [RaftManager nodeId=1] Completed transition to Unattached(epoch=0, voters=[1], electionTimeoutMs=9037) (org.apache.kafka.raft.QuorumState) +... +~~~~ + +Just like with a ZooKeeper based broker, you can connect to port 9092 (or whatever port you configured) to perform administrative operations or produce or consume data. + +~~~~ +$ ./bin/kafka-topics.sh --create --topic foo --partitions 1 --replication-factor 1 --bootstrap-server localhost:9092 +Created topic foo. +~~~~ + +# Deployment +Unlike in ZooKeeper-based mode, where any server can become the controller, in self-managed mode, only a small group of specially selected servers can act as controllers. The specially selected controller servers will participate in the metadata quorum. Each KIP-500 controller server is either active, or a hot standby for the current active controller server. + +Typically you will select either 3 or 5 servers for this role, depending on the size of your cluster. Just like with ZooKeeper, you must keep a majority of the controllers alive in order to maintain availability. So if you have 3 controllers, you can tolerate 1 failure; with 5 controllers, you can tolerate 2 failures. Review comment: I think the main thing is emphasizing that they need to be set consistently. We don't say anything about `quorum.voters` in this README currently, but it's important to understand the basics of how to configure it to run a multi-node setup. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
