Zookeeper

ZooKeeper源码分析与实战

etcd is used by kubernetes for the same purpose etcd和Zookeeper孰优孰劣？

Handle Request

• Request

• SyncRequestProcessor

  Snapshot decided by how big log count and log size.

• PrepRequestProcessor

• FinalRequestProcessor

Data structure

ZooKeeper （四） 源码剖析：数据模型和存储

• ZKDatabase

• DataTree

  This is where the data is stored.

• FileTxnSnapLog

  Single thread block write?

Network

ZooKeeper （三）源码剖析: 服务端网络连接层 NIO

NIO Mechanism: NIOServerCnxnFactory.java

Watch node

The actual implementation is at ZKDatabase with the help of the DataTree

Election

ZooKeeper（二） 源码剖析: 群首选举

ZAB

Zookeeper (五) 源码剖析: Zab 协议

Leader -> request -> get ack -> send commit -> done

• ProposalRequestProcessor

• CommitRequest (under quorum)

• AckRequestProcessor

• FinalRequest