Zookeeper connection error

Question

We have a standalone zookeeper setup on a dev machine. It works fine for every other dev machine except this one testdev machine.

We get this error over and over aga

Answer 1

I also get the same error when i started my replicated zk, one of zkClient can not connect to localhost:2181, i checked the log file under apache-zookeeper-3.5.5-bin/logs directory, and found this:

2019-08-20 11:30:39,763 [myid:5] - WARN [QuorumPeermyid=5(secure=disabled):QuorumCnxManager@677] - Cannot open channel to 3 at election address /xxxx:3888 java.net.SocketTimeoutException: connect timed out at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:648) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:705) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:733) at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:910) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1247) 2019-08-20 11:30:44,768 [myid:5] - WARN [QuorumPeermyid=5(secure=disabled):QuorumCnxManager@677] - Cannot open channel to 4 at election address /xxxxxx:3888 java.net.SocketTimeoutException: connect timed out at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:648) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:705) at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:733) at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:910) at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1247) 2019-08-20 11:30:44,769 [myid:5] - INFO [QuorumPeermyid=5(secure=disabled):FastLeaderElection@919] - Notification time out: 51200

that means this zk server can not connect to other servers, and i found this server ping other servers fail, and after remove this server from the replica, the problem is solved.

hope this will be helpful.