Server被拉起有两种方式, Address address = new Address("123.456.789.0", 5000); CopycatServer.Builder builder = CopycatServer.builder(address); builder.withStateMachine(MapStateMachine::new); 自己拉起一个cluster, CompletableFuture<CopycatServer> future =…

看下用户注册StateMachine的过程, CopycatServer.Builder builder = CopycatServer.builder(address); builder.withStateMachine(MapStateMachine::new); MapStateMachine::new这会构造一个supplier /** * Sets the Raft state machine factory. * * @param factory The Raft state mac…

Copycat’s primary role is as a framework for building highly consistent, fault-tolerant replicated state machines. Copycat servers receive state machine operations from clients, log and replicate the operations as necessary, and apply them to a state…

https://github.com/atomix/copycat   http://atomix.io/copycat/docs/membership/   为了便于实现,Copycat把member分成3种, active, passive, and reserve members - each of which play some role in supporting rapid replacement of failed servers.   Active members are ful…

原题链接:https://loj.ac/problem/3 题目描述: --- Copycat 内存限制:256 MiB 时间限制:1000 ms 输入文件: copycat.in 输出文件: copycat.out 题目描述 这道题用于测试文件输入输出,请注意使用文件输入输出,而非标准输入输出. 输入一个正整数 a,输出这个数 a. 输入格式 第一行一个正整数 T ,表示有 T 组测试数据. 接下来 T 行,每行一个正整数 a . 输出格式 输出 T 行,每行一个正整数 a . 样例 样例输入…

Copycat server之间的configure是如何,何时被同步的?   大家可以看到,只有leader可以同步配置   1. 显式的调用LeaderState.configure LeaderState.configure /** * Commits the given configuration. */ protected CompletableFuture<Long> configure(Collection<Member> members) { final long…

对于Command,Configuration都要通过appendEntries的方式,把Entries同步给follower LeaderState.configure /** * Commits the given configuration. */ protected CompletableFuture<Long> configure(Collection<Member> members) { final long index; try (ConfigurationEntry…

Member.Status status的变迁是源于heartbeat heartbeat,append空的entries /** * Triggers a heartbeat to a majority of the cluster. * <p> * For followers to which no AppendRequest is currently being sent, a new empty AppendRequest will be * created and sent. For…

client.submit(new PutCommand("foo", "Hello world!")); ServerContext connection.handler(CommandRequest.class, request -> state.command(request)); State.command ReserveState开始,会把command forward到leader,只有leader可以处理command @Override pub…

Awesome系列的Java资源整理.awesome-java 就是akullpp发起维护的Java资源列表,内容包括:构建工具.数据库.框架.模板.安全.代码分析.日志.第三方库.书籍.Java 站点等等. 经典的工具与库 (Ancients) In existence since the beginning of time and which will continue being used long after the hype has waned. Apache Ant - Build…