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From Tao Xiao <xiaotao.cs....@gmail.com>
Subject Re: zookeeper works well but log reports "Cannot open channel to 2 at election address ... java.net.ConnectException: Connection refused"
Date Thu, 13 Feb 2014 06:18:21 GMT
Hi German,

I installed ZooKeeper in another cluster and it works well. I mean I can
query the status through "bin/zkServer.sh status", how to explain that?


2014-02-11 18:12 GMT+08:00 German Blanco <german.blanco.blanco@gmail.com>:

> Hello,
>
> It doesn't matter.
> The reason is that each zookeeper servers upon start-up try to establish
> connections with all other servers in its configuration.
> However, only one connection for pair should be there, so half of the
> connections are dropped.
> Right after connection servers send their ids. If the id of the peer
> initiating the connection is higher than the peer receiving the connection,
> then everything proceeds, otherwise connection is rejected.
> Why do peers with a lower id try to open connections with the peers with a
> higher id then?
> Because in that way, they trigger a connection attempt in the other
> direction. That is, say servers 2 and 3 have a working ensemble, they are
> not going to attempt to connect to server 1 unless something happens.
> Server 1 wakes up, it attempts to connect to servers 2 and 3 and these two
> connection attempts fail, but each triggers a connection attempt from the
> respective peer that succeeds.
> This was a bit more than you asked for, but anyway I hope it helps :-). If
> the answer doesn't work for you, please let me know.
>
> Best regards,
>
> German.
>
>
> On Tue, Feb 11, 2014 at 10:53 AM, Tao Xiao <xiaotao.cs.nju@gmail.com>
> wrote:
>
> > 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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