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

Check the zookeeper logs (/var/log/zookeeper). It looks like a connection is established, which should mean there is a record of it.

I had the same situation and it was because a process opened connections and failed to close them. This eventually exceeded the per-host connection limit and my logs were overflowing with

2016-08-03 15:21:13,201 [myid:] - WARN  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxnFactory@188] - Too many connections from /172.31.38.64 - max is 50

Assuming zookeeper is on the usual port, you could do a check for that with:

lsof -i -P | grep 2181