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Date: Tue, 11 Feb 2014 17:53:46 +0800
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Subject: zookeeper works well but log reports "Cannot open channel to 2 at
 election address ... java.net.ConnectException: Connection refused"
From: Tao Xiao <xiaotao.cs.nju@gmail.com>
To: user@zookeeper.apache.org
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I installed zookeeper 3.4.5 in a 3-node cluster and started it. I think
zookeeper works well because the HBase cluster, which relies on zookeeper,
indeed works well. But when I tried to query zookeeper's status, it
reported:

[root@imon-1 zookeeper-3.4.5]# bin/zkServer.sh status
JMX enabled by default
Using config: /usr/local/apache/zookeeper-3.4.5/bin/../conf/zoo.cfg
Error contacting service. It is probably not running.


I checked the log and found it reported the following:

2014-02-11 15:42:15,623 [myid:] - INFO  [main:QuorumPeerConfig@101] -
Reading configuration from:
/usr/local/apache/zookeeper-3.4.5/bin/../conf/zoo.cfg
2014-02-11 15:42:15,629 [myid:] - INFO  [main:QuorumPeerConfig@334] -
Defaulting to majority quorums
2014-02-11 15:42:15,652 [myid:1] - INFO  [main:DatadirCleanupManager@78] -
autopurge.snapRetainCount set to 3
2014-02-11 15:42:15,652 [myid:1] - INFO  [main:DatadirCleanupManager@79] -
autopurge.purgeInterval set to 0
2014-02-11 15:42:15,653 [myid:1] - INFO  [main:DatadirCleanupManager@101] -
Purge task is not scheduled.
2014-02-11 15:42:15,683 [myid:1] - INFO  [main:QuorumPeerMain@127] -
Starting quorum peer
2014-02-11 15:42:15,726 [myid:1] - INFO  [main:NIOServerCnxnFactory@94] -
binding to port 0.0.0.0/0.0.0.0:2181
2014-02-11 15:42:15,759 [myid:1] - INFO  [main:QuorumPeer@913] - tickTime
set to 2000
2014-02-11 15:42:15,760 [myid:1] - INFO  [main:QuorumPeer@933] -
minSessionTimeout set to -1
2014-02-11 15:42:15,760 [myid:1] - INFO  [main:QuorumPeer@944] -
maxSessionTimeout set to -1
2014-02-11 15:42:15,760 [myid:1] - INFO  [main:QuorumPeer@959] - initLimit
set to 10
2014-02-11 15:42:15,874 [myid:1] - INFO  [main:FileSnap@83] - Reading
snapshot /var/data/zk/dataDir/version-2/snapshot.100072a68
2014-02-11 15:42:18,211 [myid:1] - INFO
 [Thread-1:QuorumCnxManager$Listener@486] - My election bind port:
0.0.0.0/0.0.0.0:3888
2014-02-11 15:42:18,226 [myid:1] - INFO  [QuorumPeer[myid=1]/0.0.0.0:2181
:QuorumPeer@670] - LOOKING
2014-02-11 15:42:18,232 [myid:1] - INFO  [QuorumPeer[myid=1]/0.0.0.0:2181
:FastLeaderElection@740] - New election. My id =  1, proposed
zxid=0x1000735ac
2014-02-11 15:42:18,234 [myid:1] - INFO
 [WorkerReceiver[myid=1]:FastLeaderElection@542] - Notification: 1
(n.leader), 0x1000735ac (n.zxid), 0x1 (n.round), LOOKING (n.state), 1
(n.sid), 0x1 (n.peerEPoch), LOOKING (my state)
2014-02-11 15:42:18,256 [myid:1] - WARN
 [WorkerSender[myid=1]:QuorumCnxManager@368] - Cannot open channel to 2 at
election address imon-2/172.16.38.144:3888
java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
        at
java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:529)
        at
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:354)
        at
org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:327)
        at
org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:393)
        at
org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:365)
        at java.lang.Thread.run(Thread.java:662)
2014-02-11 15:42:18,268 [myid:1] - WARN
 [WorkerSender[myid=1]:QuorumCnxManager@368] - Cannot open channel to 3 at
election address imon-3/172.16.38.145:3888
java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
        at
java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:529)
        at
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:354)
        at
org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:327)
        at
org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:393)
        at
org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:365)
        at java.lang.Thread.run(Thread.java:662)
2014-02-11 15:42:18,436 [myid:1] - WARN  [QuorumPeer[myid=1]/0.0.0.0:2181
:QuorumCnxManager@368] - Cannot open channel to 2 at election address
imon-2/172.16.38.144:3888
java.net.ConnectException: Connection refused

... ...


Do these warnings matter?  What is the reason.

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