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From 刘明敏 <diveintotomor...@gmail.com>
Subject ZooKeeper refuse connect request from Broker due to `zxid` problem
Date Mon, 27 Feb 2012 08:14:23 GMT
I get two nodes for ZooKeeper(XX.XX.XX.231 and 229) and one node for
Broker(XX.XX.XX.227),it works well until I shutdown one of the two
ZooKeeper nodes:the broker fails to connect to the other living zookeeper.

This is the log from zookeeper(firstly it tried to connect to the living
node XX.XX.XX.231,then tried the dead node:XX.XX.XX.229,Both failed):

[2012-02-27 14:09:19,685] INFO Unable to read additional data from server
sessionid 0x135bd82dbe90001, likely server has closed socket, closing
socket connection and attempting reconnect (org.apache.zookeeper.ClientCnxn)
[2012-02-27 14:09:19,786] INFO zookeeper state changed (Disconnected)
(org.I0Itec.zkclient.ZkClient)
[2012-02-27 14:09:20,028] INFO Opening socket connection to
server XX.XX.XX.231/XX.XX.XX.231:2182 (org.apache.zookeeper.ClientCnxn)
[2012-02-27 14:09:20,035] INFO Socket connection established
to XX.XX.XX.231/XX.XX.XX.231:2182, initiating session
(org.apache.zookeeper.ClientCnxn)
[2012-02-27 14:09:20,037] INFO Unable to read additional data from server
sessionid 0x135bd82dbe90001, likely server has closed socket, closing
socket connection and attempting reconnect (org.apache.zookeeper.ClientCnxn)
[2012-02-27 14:09:20,527] INFO Opening socket connection to
server XX.XX.XX.229/XX.XX.XX.229:2181 (org.apache.zookeeper.ClientCnxn)
[2012-02-27 14:09:20,528] WARN Session 0x135bd82dbe90001 for server null,
unexpected error, closing socket connection and attempting reconnect
(org.apache.zookeeper.ClientCnxn)
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:701)
        at
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1119)


This is the log from the living zookeeper(zooKeeper refuse session request
due to `zxid` staff,which I don't quite get it):

[2012-02-27 14:54:50,261] INFO Accepted socket connection from
/XX.XX.XX.227:48602 (org.apache.zookeeper.server.NIOServerCnxn)
[2012-02-27 14:54:50,261] INFO Refusing session request for client
/XX.XX.XX.227:48602 as it has seen zxid 0x1120 our last zxid is 0x2c client
must try another server (org.apache.zookeeper.server.NIOServerCnxn)
[2012-02-27 14:54:50,261] INFO Closed socket connection for client
/XX.XX.XX.227:48602 (no session established for client)
(org.apache.zookeeper.server.NIOServerCnxn)

Why am I causing this `zxid` error , anything I am doing wrong here?

I thought the broker can automatic connect to another zookeeper if the one
that it is connecting to fails,right?

Thanks

-- 
Best Regards

----------------------
刘明敏 | mmLiu

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