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

Had the same error during setup on a 2 node cluster. I discovered I had mixed up the contents of the myid file versus the server.id=HOST_IP:port entry.

Essentially, if you have two servers (SERVER1 and SERVER2) for which you have created "myid" files in dataDir for zookeeper as below

SERVER1 (myid)
1

SERVER2 (myid)
2

Ensure the entry in your zoo.cfg file corresponds for each of these i.e server.1 should use SERVER1 hostname and server.2 should use SERVER2 hostname followed by the port as below

SERVER1 (zoo.cfg)
... (other config omitted)
server.1=SERVER1:2888:3888
server.2=SERVER2:2888:3888

SERVER2 (zoo.cfg)
... (other config omitted)
server.1=SERVER1:2888:3888
server.2=SERVER2:2888:3888

Just to make sure, I also deleted the version-* folder in the dataDir then restarted Zookeeper to get it working.