Zookeeper 3.4.6 suddenly needs a total wipeout

[Omer,Anat Gazit]

Hello,

We have serious issues with ZooKeeper 3.4.6

It happened twice so far : on the leap second (30th Of June) and again after we bootstrapped.

In both occassaions the ZooKeepers did not accept any connections (org.apache.zookeeper.ClientCnxn$SendThread; -Session 0x14e487fc3de018b for server null, unexpected error, closing socket connection and attempting reconnect

java.net.ConnectException: Connection refused)

The only way to resolve it was to :

1. Kill ZooKeeper

2. Wipeout all its data.

3. Bootstrap 

4. Restart the servers.

Any idea what to do with this issue?