问题描述
Linux环境下
今天搭建了一个zookeeper集群，分别为server2,server3,server4。
报错如下:
2022-08-08 22:10:44,294 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1240] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect 2022-08-08 22:10:45,716 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1112] - Opening socket connection to server localhost/0:0:0:0:0:0:0:1:2181. Will not attempt to authenticate using SASL (unknown error) 2022-08-08 22:10:45,717 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@959] - Socket connection established, initiating session, client: /0:0:0:0:0:0:0:1:41288, server: localhost/0:0:0:0:0:0:0:1:2181 2022-08-08 22:10:45,718 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1240] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect 2022-08-08 22:10:47,382 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1112] - Opening socket connection to server localhost/0:0:0:0:0:0:0:1:2181. Will not attempt to authenticate using SASL (unknown error) 2022-08-08 22:10:47,383 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@959] - Socket connection established, initiating session, client: /0:0:0:0:0:0:0:1:41290, server: localhost/0:0:0:0:0:0:0:1:2181 2022-08-08 22:10:47,384 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1240] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect 2022-08-08 22:10:48,849 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1112] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error) 2022-08-08 22:10:48,850 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@959] - Socket connection established, initiating session, client: /127.0.0.1:39428, server: localhost/127.0.0.1:2181 2022-08-08 22:10:48,852 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1240] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect 2022-08-08 22:10:50,397 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1112] - Opening socket connection to server localhost/0:0:0:0:0:0:0:1:2181. Will not attempt to authenticate using SASL (unknown error) 2022-08-08 22:10:50,398 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@959] - Socket connection established, initiating session, client: /0:0:0:0:0:0:0:1:41294, server: localhost/0:0:0:0:0:0:0:1:2181 2022-08-08 22:10:50,399 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1240] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect 2022-08-08 22:10:52,214 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1112] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error) 2022-08-08 22:10:52,215 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@959] - Socket connection established, initiating session, client: /127.0.0.1:39432, server: localhost/127.0.0.1:2181 2022-08-08 22:10:52,217 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1240] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect 2022-08-08 22:10:54,073 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1112] - Opening socket connection to server localhost/0:0:0:0:0:0:0:1:2181. Will not attempt to authenticate using SASL (unknown error) 2022-08-08 22:10:54,074 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@959] - Socket connection established, initiating session, client: /0:0:0:0:0:0:0:1:41298, server: localhost/0:0:0:0:0:0:0:1:2181 2022-08-08 22:10:54,077 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1240] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect 2022-08-08 22:10:55,613 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1112] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error) 2022-08-08 22:10:55,614 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@959] - Socket connection established, initiating session, client: /127.0.0.1:39436, server: localhost/127.0.0.1:2181
在一个节点上进入到zookeeper命令行执行zkCli.sh 时,报了下面这个异常!
原因分析：
一开始我以为配置文件的错误，但是经过检查后发现并不是这里的问题，所以我开始思考zookeeper的搭建机制
例如：半数机制：集群中半数以上机器存活，集群可用。所以Zookeeper适合安装奇数台服务器。
解决方案：
例如你一次性启动了三台服务器，并且都使用zookeeper进行调度的话，就至少需要启动两台的zookeeper
那么你只需要再启动一台机器的zookeeper，多按几下回车刷新就可以了
