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From Phil H <>
Subject RE: Zookeeper - help!
Date Tue, 02 Oct 2018 06:07:06 GMT
Hi Andy,

Thanks for the additional info.  I think I saw a link to that while searching but was wary
since it was such an old version.

I have two VMs (nifi1, and nifi2) both running NiFi with identical configs, and trying to
use the inbuilt ZK to cluster them.

If I only mention a single machine within the config (eg: if nifi1 doesn’t refer to nifi2,
or visa versa) I don’t get any start up errors.


From: Andy LoPresto
Sent: Tuesday, 2 October 2018 1:00 PM
Subject: Re: Zookeeper - help!

Hi Phil, 

Nathan’s advice is correct but I think he was assuming all other configurations are correct
as well. Are you trying to run both NiFi nodes and ZK instances on the same machine? In that
case you will have to ensure that the ports in use are different for each service so they
don’t conflict. Setting them all to the same value only works if each service is running
on an independent physical machine, virtual machine, or container. 

I find Pierre’s guide [1] to be a helpful step-by-step instruction list as well as a good
explanation of how the clustering concepts work in practice. When you get that working, and
you’re ready to set up a secure cluster, he has a follow-on guide for that as well [2].
Even as someone who has set up many clustered instances of NiFi, I use his guides regularly
to ensure I haven’t forgotten a step. 

They were originally written for versions 1.0.0 and 1.1.0, but the only thing that has changed
is the authorizer configuration for the secure instances (you’ll need to put the Initial
Admin Identity and Node Identities in two locations in the authorizers.xml file instead of
just once). 

Hopefully this helps you get a working cluster up and running so you can experiment. Good


Andy LoPresto
PGP Fingerprint: 70EC B3E5 98A6 5A3F D3C4  BACE 3C6E F65B 2F7D EF69

On Oct 1, 2018, at 2:45 PM, Phil H <> wrote:

Thanks Nathan,

I changed the protocol.port to 10002 on both servers.

On server 1, I now just see endless copies of the second error from my original message (“KeeperException$ConnectionLossException:
KeeperErrorCode = ConnectionLoss”) – I don’t know if that’s normal when there’s
only a single member of a cluster alive and running?  Seems like the logs will fill up very
quickly if it is!

On server 2, I get a bind exception on the Zookeeper client port.  It doesn’t matter what
I set it to (In this example, I changed it to 10500) I always get the same result.  If I
run netstat when nifi isn’t running, there’s nothing listening on the port.  It’s like
NiFi is starting two Zookeeper instances?!  There’s no repeat of this in the start up sequence
though.  Both servers are running completely vanilla 1.6.0 – I don’t even have any flow
defined yet, this is purely for teaching myself clustering config – so I don’t know why
one is behaving differently to the other.

2018-10-02 17:36:31,610 INFO [QuorumPeer[myid=2]/] o.a.zookeeper.server.ZooKeeperServer
Created server with tickTime 2000 minSessionTimeout 4000 maxSessionTimeout 40000 datadir ./state/zookeeper/version-2
snapdir ./state/zookeeper/version-2
2018-10-02 17:36:31,612 ERROR [QuorumPeer[myid=2]/] o.apache.zookeeper.server.quorum.Leader
Couldn't bind to nifi2.domain/ Address already in use (Bind failed)
	at Method)
	at org.apache.zookeeper.server.quorum.Leader.<init>(
	at org.apache.zookeeper.server.quorum.QuorumPeer.makeLeader(

From: Nathan Gough
Sent: Tuesday, 2 October 2018 2:22 AM
Subject: Re: Zookeeper - help!

Hi Phil,

One thing I notice with your config is that the cluster.node.protol.port and the zookeeper
ports are the same - these should not be the same. Node.protocol.port is used by NiFi cluster
to communicate between nodes, the zookeeper.connect.string port should be the port that zookeeper
service is listening on. The zookeeper port is configured by the clientPort property in the file. This would make your connect string: 'nifi.zookeeper.connect.string=nifi1.domain:2180,nifi2.domain:2180',
where 2180 is whatever clientPort is configured.

You can read more about how NiFi uses Zookeeper and how to configure it here:

Let us know what happens once these properties are configured correctly.


On 9/30/18, 11:07 PM, "Phil H" <> wrote:

   Hi guys,

   Pulling my hair out trying to solve my Zookeeper problems.  I have two 1.6.0 servers
that I am trying to cluster.

   Here is the except from the properties files – all other properties are default so
omitted for clarity.   The servers are set up to run HTTPS, and the interface works via
the browser, so I believe the certificates are correctly installed.

   Server nifi1.domain:


   Server nifi2.domain:


   I am getting these errors (this is from server 2, but seeing the same on server 1 apart
from a different address, of course):

   2018-10-01 20:54:16,332 INFO [main] Now listening
for connections from nodes on port 10000
   2018-10-01 20:54:16,381 INFO [main] o.apache.nifi.controller.FlowController Successfully
synchronized controller with proposed flow
   2018-10-01 20:54:16,435 INFO [main] o.a.nifi.controller.StandardFlowService Connecting
Node: nifi2.domain:443
   2018-10-01 20:54:16,769 ERROR [Process Cluster Protocol Request-1]
The incoming request did not contain client certificates and thus the DN cannot be extracted.
Check that the other endpoint is providing a complete client certificate chain
   2018-10-01 20:54:16,771 WARN [Process Cluster Protocol Request-1] o.a.n.c.p.impl.SocketProtocolListener
Failed processing protocol message from nifi2 due to org.apache.nifi.cluster.protocol.ProtocolException: peer not
   org.apache.nifi.cluster.protocol.ProtocolException: peer not authenticated
           at org.apache.nifi.cluster.protocol.impl.SocketProtocolListener.getRequestorDN(
           at org.apache.nifi.cluster.protocol.impl.SocketProtocolListener.dispatchRequest(
           at java.util.concurrent.ThreadPoolExecutor.runWorker(
           at java.util.concurrent.ThreadPoolExecutor$
   Caused by:
peer not authenticated
           at org.apache.nifi.cluster.protocol.impl.SocketProtocolListener.getRequestorDN(
           ... 5 common frames omitted
   Caused by: peer not authenticated
           ... 7 common frames omitted

   2018-10-01 20:54:32,249 INFO [Curator-Framework-0] o.a.c.f.state.ConnectionStateManager
State change: SUSPENDED
   2018-10-01 20:54:32,250 ERROR [Curator-Framework-0] o.a.c.f.imps.CuratorFrameworkImpl
Background operation retry gave up
   org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss
           at org.apache.zookeeper.KeeperException.create(
           at org.apache.curator.framework.imps.CuratorFrameworkImpl.checkBackgroundRetry(
           at org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(
           at org.apache.curator.framework.imps.CuratorFrameworkImpl.backgroundOperationsLoop(
           at org.apache.curator.framework.imps.CuratorFrameworkImpl.access$300(
           at org.apache.curator.framework.imps.CuratorFrameworkImpl$
           at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(
           at java.util.concurrent.ScheduledThreadPoolExecutor$
           at java.util.concurrent.ThreadPoolExecutor.runWorker(
           at java.util.concurrent.ThreadPoolExecutor$

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