选主 使用ZooKeeper选主的一个简单方法是,在创建znode时使用Sequence和Ephemeral标志.主要思想是,使用一个znode,比如"/election",每个客户端创建一个子节点"/election/guid-n_",并同时使用Sequence和Ephemeral标志.使用sequence标志后ZooKeeper会自动递增序列号.拥有最小编号的节点就是主节点. 这还不是全部,同时还需要watch主节点的失效,在当前主节点失效后,会产生新的主节点.…

hihoCoder #1426 : What a Ridiculous Election(总统夶选) 时间限制:1000ms 单点时限:1000ms 内存限制:256MB Description - 题目描述 In country Light Tower, a presidential election is going on. There are two candidates,  Mr. X1 and Mr. X2, and both of them are not like good per…

repmgr_method.c, __repmgr_start_int() 初始2个elect线程. repmgr_elect.c, __repmgr_init_election() __repmgr_elect_thread() __repmgr_elect_main() lease, preferred master mode, rep_elect.c,   __repmgr_elect() __rep_elect_init() lockout, if (rep->egen != egen)…

Election Time Time Limit: 1000MS Memory limit: 65536K 题目描述 The cows are having their first election after overthrowing the tyrannical Farmer John, and Bessie is one of N cows (1 ≤ N ≤ 50,000) running for President. Before the election actually happen…

zookeeper集群   启动 1.问题现象. 启动每一个都提示  STARTED 但是查看 status时全部节点都报错 [root@ip-172-31-19-246 bin]# sh zkServer.sh  start ZooKeeper JMX enabled by default Using config: /usr/local/zookeeper-3.4.8/bin/../conf/zoo.cfg Starting zookeeper ... STARTED [root@ip-17…

Description It's election time. The farm is partitioned into a 5x5 grid of cow locations, each of which holds either a Holstein ('H') or Jersey ('J') cow. The Jerseys want to create a voting district of 7 contiguous (vertically or horizontally) cow l…

1675: [Usaco2005 Feb]Rigging the Bovine Election 竞选划区 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 198  Solved: 118[Submit][Status][Discuss] Description It's election time. The farm is partitioned into a 5x5 grid of cow locations, each of which hold…

1675: [Usaco2005 Feb]Rigging the Bovine Election 竞选划区 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 196  Solved: 116[Submit][Status][Discuss] Description It's election time. The farm is partitioned into a 5x5 grid of cow locations, each of which hold…

If the media coverage is anything to go by, people are desperate to know who will win the US election on November 8. Polls give us some indication of what's likely to happen, but any single poll isn't a great guide (despite the hype that accompanies…

Description It's election time. The farm is partitioned into a 5x5 grid of cow locations, each of which holds either a Holstein ('H') or Jersey ('J') cow. The Jerseys want to create a voting district of 7 contiguous (vertically or horizontally) cow l…