zookeeper報Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect的解決

現象

服務器連不上，kafka報connection refused

測試發現kafka某台node(xx)的問題，登錄上去也各種錯誤，zkServer.sh restart可以完成，但status報連不上。報錯比較迷惑人，打開java log看到其他錯誤：

——————————

kafka complains connection refused. check it's a node's problem, even restart cannot fix. see java log below:

[myid:3] - INFO  [ListenerThread:QuorumCnxManager$Listener@534] - My election bind port: /yy:3888

java.net.BindException: Cannot assign requested address

...

[myid:3] - WARN  [WorkerSender[myid=3]:QuorumCnxManager@400] - Cannot open channel to 1 at election address /xx:3888

java.net.ConnectException: Connection refused

其實這個錯誤可以看出來，出現了xx和yy2個地址，說明它認錯了自己

——————————

the cause is setting config wrong  

解決方案

從zoo.cfg看下datadir，將下面的myid改成和zoo.cfg里的自己一樣的。比如xx是

server.1=xx:2888:3888
server.2=yy:2888:3888
server.3=zz:2888:3888

那么它的myid必須是1

————————————

the right way is to make myid's id same with zoo.cfg's