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 <[email protected]>: > 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 <[email protected]> > 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. > > >
