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Posted to users@nifi.apache.org by Axel Schwarz <Ax...@emailn.de> on 2021/10/22 09:19:16 UTC
Re: Re: Re: Disfunctional cluster with version 1.13.2
For anyone having similiar behaviour/problems, I want to tell you guys about what we did to address this so far:
We installed 1.13.2 again, as we thought we cleared any inconvinience with "external" stuff like ZooKeeper (established an external cluster as proposed by Mark) and MinIO (stabilized the cluster in general following best practices) and running smoothely for weeks under version 1.12.1.
9 hours after the update the cluster stopped working. Login didn't work anymore and the flow did not take in any data from our servers. So we were back to the state, at which I posted this thread originally.
After some research I think I found the reason for this behaviour, which seems to be that there were no elected Primary Node and Cluster Coordinator anymore. We still had the issues with ZooKeeper, as described in the original post, despite relying on an external cluster already. ZooKeeper does not restart every few minutes anymore, but the Nifi nodes changed to state SUSPENDED and back to RECONNECTED at around every half an hour. As also already mentioned in the original post, this behaviour also took place under version 1.12.1, but did never end in a disfunctional cluster.
So, as this seems to be an issue with election and/or ZooKeeper connection stability, I started to further stabilize the ZooKeeper cluster, by digging deeper into best practices etc. and did the following:
- Increased RAM from 2GB to 4GB per node
- Limit Java Heap Size to 2GB for ZooKeeper (create file "/[zookeeper_home]/conf/java.env" with content "export JVMFLAGS="-Xmx2048m"")
- disable swappiness to be sure linux never swapps, as this would be "dead to ZooKeeper" (add the line "vm.swappiness=0" to /etc/sysctl.conf)
- Increased ZooKeeper timeouts in Nifi config from 10s to 30s (nifi.zookeeper.connect.timeout and nifi.zookeeper.session.timeout)
So far (around 20h running) there are no SUSPENDED/RECONNECTED messages in the Nifi log anymore and the cluster is running pretty nicely. My personal feeling is, that the increase of these timeouts did the trick, but of course thats just a feeling as I cannot proof it.
I hope this will last and I'll keep you posted. :)
--- Ursprüngliche Nachricht ---
Von: "Axel Schwarz" <Ax...@emailn.de>
Datum: 27.08.2021 11:07:13
An: users@nifi.apache.org
Betreff: Re: Re: Disfunctional cluster with version 1.13.2
> Hey Mark,
>
> thanks again for your help. We just installed a dedicated Zookeeper Cluster.
> I will report our experiences regarding this topic as soon as we regained
> the courage to update to version 1.13.2 again :D
>
> --- Ursprüngliche Nachricht ---
> Von: Mark Payne <ma...@hotmail.com>
> Datum: 23.08.2021 15:50:35
> An: "users@nifi.apache.org" <us...@nifi.apache.org>, Axel
> Schwarz <Ax...@emailn.de>
> Betreff: Re: Disfunctional cluster with version 1.13.2
>
> > Hey Axel,
> >
> > Yes - it is definitely advisable to run zookeeper external to NiFi,
> on another
> > server/VM. In fact - I would not recommend running any other service
> co-located
> > with NiFi. NiFi is really designed to be quite greedy and make use of
> whatever
> > hardware you allow it to. This can be a problem specifically with ZooKeeper.
>
> > If a NiFi node gets really busy (due to a sudden burst of traffic, for
> example),
> > it can easily starve Zookeeper of threads. This can happen due to over-utilization
>
> > of the CPU, or it can happen due to a lot of garbage collection, etc.
> Typically
> > this is a very temporary thing and NiFi happily recovers once the load
> has
> > been worked down.
> >
> > But when this happens, if using an embedded ZK, all of the nodes in
> the NiFi
> > cluster would start having trouble communicating with ZooKeeper. As
> a result,
> > they will all start disconnecting and reconnecting. This, in turn, puts
> greater
> > stress on the node that is already falling behind. And so begins a cycle
>
> > that can lead to cluster instability. Running an external ZooKeeper
> on the
> > same node is better than embedded because at least it doesn’t share
> the same
> > JVM / heap / garbage collection, etc. But contention with disks &
> cpu
> > can still cause the same issues. So running it elsewhere is definitely
> recommended.
> >
> >
> > In terms of how many zookeeper servers to use - it really depends on
> what
> > you need. A single Zookeeper instance is enough to get up & running
> but
> > becomes a single point of failure, so typically 3 nodes are recommended
> for
> > ZooKeeper (though the nodes don’t need to be particularly powerful).
> I don’t
> > think adding any additional nodes provides any benefit, beyond making
> it
> > more resilient if additional ZK nodes fail.
> >
> > Thanks
> > -Mark
> >
> > > On Aug 23, 2021, at 4:30 AM, Axel Schwarz <Ax...@emailn.de>
>
> > wrote:
> > >
> > > Hey Mark,
> > >
> > > thanks for your answer. We always had an external zookeeper running,
>
> > but on the same hosts as the nifi instances. But as we were researching
> through
> > the load balancing problem in version 1.13.2, we decided to use the
> embedded
> > zookeeper, because in the documentation there is no hint at all to use
> an
> > external zookeeper instance in production environment. So we just thought
>
> > we should get rid of that possible source of error. Like incompatible
> versions
> > etc.
> > >
> > > So just to be clear: It's officially advisable to run some external
>
> > zookeeper instance on extra servers? If so, which version should we
> use?
> > How many servers should a zookeeper cluster have to manage 3-5 Nifi-Hosts?
>
> >
> > >
> > > Gotta say, I really appreciate all the work this community puts
> into
> > helping others. I hope I can give something back some time.
> > >
> > > --- Ursprüngliche Nachricht ---
> > > Von: Mark Payne <ma...@hotmail.com>
> > > Datum: 17.08.2021 16:13:29
> > > An: "users@nifi.apache.org" <us...@nifi.apache.org>,
>
> > Axel Schwarz <Ax...@emailn.de>
> > > Betreff: Re: Disfunctional cluster with version 1.13.2
> > >
> > >> Axel,
> > >>
> > >> So a few things to consider here.
> > >>
> > >> The NullPointer that you’re showing there in the logs was fixed
>
> > in 1.14.0
> > >> [1].
> > >>
> > >> Secondly, is a question of why the ZooKeeper client is disconnecting.
>
> > Given
> > >> that you’re running an embedded zookeeper server, it could
> be for
> > any number
> > >> of reasons - low java heap, too high CPU usage, over-utilized
> disks,
> > etc.
> > >> The embedded zookeeper is a convenience that should be used
> for
> > testing &
> > >> playing around locally but should never be used for production
> use
> > - you
> > >> should always depend on an external zookeeper for any production
>
> > use case,
> > >> running on a different machine (or set of machines). I suspect
> moving
> > to
> > >> an external zookeeper alone will be enough to help significantly
>
> > here.
> > >>
> > >> But if you run into issues after moving to an external zookeeper,
>
> > would recommend
> > >> running “bin/nifi.sh diagnostics diag1.txt” when you’re having
> trouble.
> > This
> > >> will gather all sorts of information that you should be able
> to
> > share, including
> > >> garbage collection information, how many times the cluster
> coordinator
> > is
> > >> changing, etc. that can be helpful in diagnosing cluster-related
>
> > issues.
> > >>
> > >>
> > >> Thanks
> > >> -Mark
> > >>
> > >> [1] https://issues.apache.org/jira/browse/NIFI-8394
> > >>
> > >>
> > >>> On Aug 17, 2021, at 1:18 AM, Axel Schwarz <Ax...@emailn.de>
>
> >
> > >> wrote:
> > >>>
> > >>> Hey Pierre,
> > >>>
> > >>> we're currently using the embedded ZK. So as far as I know
> this
> > is Version
> > >> 3.5.6
> > >>>
> > >>> --- Ursprüngliche Nachricht ---
> > >>> Von: Pierre Villard <pi...@gmail.com>
>
> > >>> Datum: 16.08.2021 16:59:22
> > >>> An: users@nifi.apache.org, Axel Schwarz <Ax...@emailn.de>
>
> >
> > >>
> > >>> Betreff: Re: Disfunctional cluster with version 1.13.2
>
> > >>>
> > >>>> Hi,
> > >>>>
> > >>>> What's the version of ZK?
> > >>>>
> > >>>> Thanks,
> > >>>> Pierre
> > >>>>
> > >>>> Le jeu. 12 août 2021 à 09:55, Axel Schwarz <Ax...@emailn.de>
>
> >
> > >> a
> > >>>> écrit :
> > >>>>
> > >>>>> Dear all,
> > >>>>>
> > >>>>> after successfully battling the load balancing
> and installing
> >
> > >> Version
> > >>>>
> > >>>>> 1.13.2 again in our 3 node production environment,
> we
> > experienced
> > >> another
> > >>>>
> > >>>>> failure in the cluster resulting in a complete
> cut-off
> > of the
> > >> flow just
> > >>>>
> > >>>>> 1,5h after the update.
> > >>>>> We noticed it just by trying to access the webinterface,
>
> > which
> > >> immediately
> > >>>>
> > >>>>> after login showed something like:
> > >>>>>
> > >>>>> "Cannot replicate request to Node nifiHost1.contoso.com:8443
>
> >
> > >> because
> > >>>> the
> > >>>>> node is not connected"
> > >>>>>
> > >>>>> There was nothing we could do through the webinterface
>
> > aside
> > >> from staring
> > >>>>
> > >>>>> at this message and when looking at the live logs,
> there
> > was
> > >> nothing
> > >>>>
> > >>>>> suspicious. The log moved on as if nothing happened.
>
> >
> > >>>>> After a restart of the cluster everything was working
>
> > fine again,
> > >> but
> > >>>> we
> > >>>>> saw, that the entire flow wasn't working for some
> period
> > of
> > >> time. This
> > >>>>
> > >>>>> alone is really uncool, as we running a cluster
> for
> > exactly
> > >> that reason:
> > >>>>
> > >>>>> The flow should keep working, even if some node
> decides
> > to malfunction
> > >>
> > >>>> for
> > >>>>> whatever reason.
> > >>>>>
> > >>>>> Digging a little deeper into the logs showed two
> noticable
> > problems:
> > >>
> > >>>>
> > >>>>>
> > >>>>> 1. The Zookeeper is restarting every few minutes.
> Which
> > in the
> > >> log always
> > >>>>
> > >>>>> looks like this:
> > >>>>>
> > >>>>> ------------------------------------(nifiHost1.contoso.com)
>
> >
> > >>
> > >>>>> nifi-app.log------------------------------------------------------------------------------------
>
> >
> > >>
> > >>>>
> > >>>>>
> > >>>>> 2021-08-11 12:02:39,187 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> 2021-08-11 12:02:39,187 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer shutting down
>
> > >>>>> 2021-08-11 12:02:39,194 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.z.server.FinalRequestProcessor shutdown of
> request
> > processor
> > >> complete
> > >>>>
> > >>>>> 2021-08-11 12:02:39,196 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.z.server.SyncRequestProcessor Shutting down
>
> > >>>>> 2021-08-11 12:02:39,196 INFO [SyncThread:1]
> > >>>>> o.a.z.server.SyncRequestProcessor SyncRequestProcessor
>
> > exited!
> > >>
> > >>>>> 2021-08-11 12:02:39,199 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer minSessionTimeout
>
> > set to
> > >> 4000
> > >>>>> 2021-08-11 12:02:39,200 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer maxSessionTimeout
>
> > set to
> > >> 40000
> > >>>>
> > >>>>> 2021-08-11 12:02:39,200 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Created server
>
> > with tickTime
> > >> 2000
> > >>>>
> > >>>>> minSessionTimeout 4000 maxSessionTimeout 40000
> datadir
> >
> > >>>>> /opt/nifi/logs/zookeeper/version-2 snapdir
> > >>>>> /opt/nifi/state/zookeeper/version-2
> > >>>>> 2021-08-11 12:02:39,276 ERROR [Timer-Driven Process
>
> > Thread-27-EventThread]
> > >>
> > >>>>
> > >>>>> org.apache.zookeeper.ClientCnxn Error while calling
>
> > watcher
> > >>
> > >>>>> java.lang.NullPointerException: null
> > >>>>> at
> > >>>>> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:535)
>
> >
> > >>
> > >>>>
> > >>>>> at
> > >>>>> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:510)
>
> >
> > >>
> > >>>>
> > >>>>> 2021-08-11 12:02:39,277 INFO [main-EventThread]
>
> > >>>>> o.a.c.f.state.ConnectionStateManager State change:
> SUSPENDED
> >
> > >>
> > >>>>> 2021-08-11 12:02:40,001 INFO [main-EventThread]
>
> > >>>>> o.a.c.f.state.ConnectionStateManager State change:
> RECONNECTED
> >
> > >>
> > >>>>> 2021-08-11 12:02:40,006 INFO [Curator-ConnectionStateManager-0]
>
> >
> > >>
> > >>>>> o.a.n.c.l.e.CuratorLeaderElectionManager
> > >>>>> org.apache.nifi.controller.leader.election.CuratorLeaderElectionManager$ElectionListener@1d37e350
>
> >
> > >>
> > >>>>
> > >>>>> Connection State changed to SUSPENDED
> > >>>>> 2021-08-11 12:02:40,006 INFO [Curator-ConnectionStateManager-0]
>
> >
> > >>
> > >>>>> o.a.n.c.l.e.CuratorLeaderElectionManager
> > >>>>> org.apache.nifi.controller.leader.election.CuratorLeaderElectionManager$ElectionListener@1908642e
>
> >
> > >>
> > >>>>
> > >>>>> Connection State changed to SUSPENDED
> > >>>>> 2021-08-11 12:02:40,006 INFO [Curator-ConnectionStateManager-0]
>
> >
> > >>
> > >>>>> o.a.n.c.l.e.CuratorLeaderElectionManager
> > >>>>> org.apache.nifi.controller.leader.election.CuratorLeaderElectionManager$ElectionListener@1d37e350
>
> >
> > >>
> > >>>>
> > >>>>> Connection State changed to RECONNECTED
> > >>>>> 2021-08-11 12:02:40,006 INFO [Curator-ConnectionStateManager-0]
>
> >
> > >>
> > >>>>> o.a.n.c.l.e.CuratorLeaderElectionManager
> > >>>>> org.apache.nifi.controller.leader.election.CuratorLeaderElectionManager$ElectionListener@1908642e
>
> >
> > >>
> > >>>>
> > >>>>> Connection State changed to RECONNECTED
> > >>>>> 2021-08-11 12:02:40,014 INFO [main-EventThread]
>
> > >>>>> o.a.c.framework.imps.EnsembleTracker New config
> event
> > received:
> > >> {}
> > >>>>> 2021-08-11 12:02:40,127 INFO [Clustering Tasks
> Thread-2]
> >
> > >>>>> o.a.n.c.c.ClusterProtocolHeartbeater Heartbeat
> created
> > at 2021-08-11
> > >>
> > >>>>
> > >>>>> 12:02:39,176 and sent to nifiHost3.contoso.com:54321
>
> > at 2021-08-11
> > >>
> > >>>>> 12:02:40,127; send took 951 millis
> > >>>>> 2021-08-11 12:02:40,186 ERROR [Timer-Driven Process
>
> > Thread-27-EventThread]
> > >>
> > >>>>
> > >>>>> org.apache.zookeeper.ClientCnxn Error while calling
>
> > watcher
> > >>
> > >>>>> java.lang.NullPointerException: null
> > >>>>> at
> > >>>>> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:535)
>
> >
> > >>
> > >>>>
> > >>>>> at
> > >>>>> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:510)
>
> >
> > >>
> > >>>>
> > >>>>>
> > >>>>>
> > >>>>> ------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> >
> > >>
> > >>>>
> > >>>>>
> > >>>>> This happens, as mentioned, every few minutes and
> looks
> > like
> > >> this when
> > >>>>
> > >>>>> condensed through grep:
> > >>>>>
> > >>>>> ------------------------------------(nifiHost1.contoso.com)
>
> >
> > >> nifi-app.log
> > >>>>
> > >>>>> | grep "ZooKeeperServer Shutting
> > >>>>> down"---------------------------------------------
>
> >
> > >>>>>
> > >>>>> ./nifi-app.log:4237:2021-08-11 12:02:39,187 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:4378:2021-08-11 12:03:22,084 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:4447:2021-08-11 12:03:57,639 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:4563:2021-08-11 12:04:18,921 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:4629:2021-08-11 12:04:33,199 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:4650:2021-08-11 12:05:03,939 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:4801:2021-08-11 12:05:39,348 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:5327:2021-08-11 12:06:56,736 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:7250:2021-08-11 12:21:41,464 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:7703:2021-08-11 12:24:54,244 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:8148:2021-08-11 12:27:21,093 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:8190:2021-08-11 12:27:37,820 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:8350:2021-08-11 12:28:37,417 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:8797:2021-08-11 12:33:25,184 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:8813:2021-08-11 12:33:39,672 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:8971:2021-08-11 12:34:22,003 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:8984:2021-08-11 12:34:36,511 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:9349:2021-08-11 12:36:29,802 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:9376:2021-08-11 12:36:41,541 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:9491:2021-08-11 12:37:12,390 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:9504:2021-08-11 12:37:25,888 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:9676:2021-08-11 12:39:22,775 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:9842:2021-08-11 12:40:49,396 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:10251:2021-08-11 12:43:38,807 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:10397:2021-08-11 12:44:36,326 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:11405:2021-08-11 12:52:26,384 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:11629:2021-08-11 12:53:33,054 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:11827:2021-08-11 12:54:43,783 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:11990:2021-08-11 12:56:23,389 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:12085:2021-08-11 12:57:21,410 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:12823:2021-08-11 13:01:23,674 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:13087:2021-08-11 13:04:44,524 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:14610:2021-08-11 13:16:15,432 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:14635:2021-08-11 13:16:37,724 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:14751:2021-08-11 13:17:38,169 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:15136:2021-08-11 13:17:59,547 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:15203:2021-08-11 13:18:30,695 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:15516:2021-08-11 13:21:43,631 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:15743:2021-08-11 13:22:49,630 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:15950:2021-08-11 13:23:50,574 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:16035:2021-08-11 13:24:30,913 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:16396:2021-08-11 13:28:01,873 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:16470:2021-08-11 13:29:12,550 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:16541:2021-08-11 13:29:38,490 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:16568:2021-08-11 13:29:53,554 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:16678:2021-08-11 13:31:13,437 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> ./nifi-app.log:16705:2021-08-11 13:31:28,195 INFO
>
> > >>>>> [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>>
> > >>>>>
> > >>>>> ------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> >
> > >>
> > >>>>
> > >>>>>
> > >>>>> So my first question is: Is this behaviour of zookeeper
>
> > normal?
> > >> Well
> > >>>> it is
> > >>>>> just an INFO, but I would love to here that this
> is
> > a completely
> > >> normal
> > >>>>
> > >>>>> phenomenon. :D
> > >>>>>
> > >>>>> 2. After all these zookeeper restarts, nifi finally
>
> > throws the
> > >> following
> > >>>>
> > >>>>> error along with the "last" zookeeper
> restart:
> >
> > >>>>>
> > >>>>> ------------------------------------(nifiHost1.contoso.com)
>
> >
> > >>
> > >>>>> nifi-app.log------------------------------------------------------------------------------------
>
> >
> > >>
> > >>>>
> > >>>>>
> > >>>>> 2021-08-11 13:31:13,083 INFO [main-EventThread]
>
> > >>>>> o.a.c.f.state.ConnectionStateManager State change:
> SUSPENDED
> >
> > >>
> > >>>>> 2021-08-11 13:31:13,437 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> 2021-08-11 13:31:13,437 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer shutting down
>
> > >>>>> 2021-08-11 13:31:13,439 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.z.server.FinalRequestProcessor shutdown of
> request
> > processor
> > >> complete
> > >>>>
> > >>>>> 2021-08-11 13:31:13,440 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.z.server.SyncRequestProcessor Shutting down
>
> > >>>>> 2021-08-11 13:31:13,440 INFO [SyncThread:1]
> > >>>>> o.a.z.server.SyncRequestProcessor SyncRequestProcessor
>
> > exited!
> > >>
> > >>>>> 2021-08-11 13:31:13,450 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer minSessionTimeout
>
> > set to
> > >> 4000
> > >>>>> 2021-08-11 13:31:13,450 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer maxSessionTimeout
>
> > set to
> > >> 40000
> > >>>>
> > >>>>> 2021-08-11 13:31:13,450 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Created server
>
> > with tickTime
> > >> 2000
> > >>>>
> > >>>>> minSessionTimeout 4000 maxSessionTimeout 40000
> datadir
> >
> > >>>>> /opt/nifi/logs/zookeeper/version-2 snapdir
> > >>>>> /opt/nifi/state/zookeeper/version-2
> > >>>>> 2021-08-11 13:31:13,462 ERROR [Load-Balance Server
> Thread-5]
> >
> > >>
> > >>>>> o.a.n.c.q.c.s.ConnectionLoadBalanceServer Failed
> to
> > communicate
> > >> with
> > >>>> Peer
> > >>>>> nifiHost2.contoso.com/192.168.1.11:19500
> > >>>>> java.io.EOFException: Expected to receive a Transaction
>
> > Completion
> > >>
> > >>>>> Indicator from Peer nifiHost2.contoso.com but encountered
>
> > EOF
> > >>
> > >>>>> at
> > >>>>> org.apache.nifi.controller.queue.clustered.server.StandardLoadBalanceProtocol.completeTransaction(StandardLoadBalanceProtocol.java:299)
>
> >
> > >>
> > >>>>
> > >>>>> at
> > >>>>> org.apache.nifi.controller.queue.clustered.server.StandardLoadBalanceProtocol.receiveFlowFiles(StandardLoadBalanceProtocol.java:275)
>
> >
> > >>
> > >>>>
> > >>>>> at
> > >>>>> org.apache.nifi.controller.queue.clustered.server.StandardLoadBalanceProtocol.receiveFlowFiles(StandardLoadBalanceProtocol.java:133)
>
> >
> > >>
> > >>>>
> > >>>>> at
> > >>>>> org.apache.nifi.controller.queue.clustered.server.ConnectionLoadBalanceServer$CommunicateAction.run(ConnectionLoadBalanceServer.java:162)
>
> >
> > >>
> > >>>>
> > >>>>> at java.lang.Thread.run(Thread.java:748)
>
> > >>>>> 2021-08-11 13:31:13,464 ERROR [Load-Balance Server
> Thread-6]
> >
> > >>
> > >>>>> o.a.n.c.q.c.s.ConnectionLoadBalanceServer Failed
> to
> > communicate
> > >> with
> > >>>> Peer
> > >>>>> nifiHost2.contoso.com/192.168.1.11:19502
> > >>>>> java.io.EOFException: Expected to receive a Transaction
>
> > Completion
> > >>
> > >>>>> Indicator from Peer nifiHost2.contoso.com but encountered
>
> > EOF
> > >>
> > >>>>> at
> > >>>>> org.apache.nifi.controller.queue.clustered.server.StandardLoadBalanceProtocol.completeTransaction(StandardLoadBalanceProtocol.java:299)
>
> >
> > >>
> > >>>>
> > >>>>> at
> > >>>>> org.apache.nifi.controller.queue.clustered.server.StandardLoadBalanceProtocol.receiveFlowFiles(StandardLoadBalanceProtocol.java:275)
>
> >
> > >>
> > >>>>
> > >>>>> at
> > >>>>> org.apache.nifi.controller.queue.clustered.server.StandardLoadBalanceProtocol.receiveFlowFiles(StandardLoadBalanceProtocol.java:133)
>
> >
> > >>
> > >>>>
> > >>>>> at
> > >>>>> org.apache.nifi.controller.queue.clustered.server.ConnectionLoadBalanceServer$CommunicateAction.run(ConnectionLoadBalanceServer.java:162)
>
> >
> > >>
> > >>>>
> > >>>>> at java.lang.Thread.run(Thread.java:748)
>
> > >>>>> 2021-08-11 13:31:13,589 INFO [Process Cluster Protocol
>
> > Request-1]
> > >>
> > >>>>> o.a.n.c.c.node.NodeClusterCoordinator Status of
> nifiHost1.contoso.com:8443
> >
> > >>
> > >>>>
> > >>>>> changed from NodeConnectionStatus[nodeId=nifiHost1.contoso.com:8443,
>
> >
> > >>
> > >>>>
> > >>>>> state=CONNECTED, updateId=16] to NodeConnectionStatus[nodeId=
>
> >
> > >>
> > >>>>> nifiHost1.contoso.com:8443, state=CONNECTING, updateId=16]
>
> >
> > >>>>> 2021-08-11 13:31:13,793 INFO [Process Cluster Protocol
>
> > Request-7]
> > >>
> > >>>>> o.a.n.c.p.impl.SocketProtocolListener Finished
> processing
> > request
> > >>
> > >>>>> 88980d85-b956-4713-9686-50d76a407871 (type=RECONNECTION_REQUEST,
>
> >
> > >>
> > >>>>> length=2209040 bytes) from nifiHost1.contoso.com:8443
>
> > in 142
> > >> millis
> > >>>>
> > >>>>> 2021-08-11 13:31:13,794 INFO [Reconnect to Cluster]
>
> >
> > >>>>> o.a.nifi.controller.StandardFlowService Processing
> reconnection
> >
> > >> request
> > >>>>
> > >>>>> from cluster coordinator.
> > >>>>> 2021-08-11 13:31:13,794 INFO [Reconnect to Cluster]
>
> >
> > >>>>> o.a.n.c.l.e.CuratorLeaderElectionManager Election
> Listener
> > for
> > >> Role
> > >>>> Primary
> > >>>>> Node disabled
> > >>>>> 2021-08-11 13:31:13,802 INFO [main-EventThread]
>
> > >>>>> o.a.c.f.state.ConnectionStateManager State change:
> RECONNECTED
> >
> > >>
> > >>>>> 2021-08-11 13:31:28,195 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Shutting down
>
> > >>>>> 2021-08-11 13:31:28,196 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer shutting down
>
> > >>>>> 2021-08-11 13:31:28,198 INFO [pool-22-thread-1]
>
> > >>>>> o.a.n.c.r.WriteAheadFlowFileRepository Initiating
> checkpoint
> >
> > >> of FlowFile
> > >>>>
> > >>>>> Repository
> > >>>>> 2021-08-11 13:31:28,202 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.z.server.FinalRequestProcessor shutdown of
> request
> > processor
> > >> complete
> > >>>>
> > >>>>> 2021-08-11 13:31:28,203 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.z.server.SyncRequestProcessor Shutting down
>
> > >>>>> 2021-08-11 13:31:28,203 INFO [SyncThread:1]
> > >>>>> o.a.z.server.SyncRequestProcessor SyncRequestProcessor
>
> > exited!
> > >>
> > >>>>> 2021-08-11 13:31:28,204 INFO [Timer-Driven Process
> Thread-21]
> >
> > >>
> > >>>>> o.a.n.p.store.WriteAheadStorePartition Successfully
>
> > rolled over
> > >> Event
> > >>>>
> > >>>>> Writer for Provenance Event Store Partition[directory=/opt/pr]
>
> >
> > >> due to
> > >>>>
> > >>>>> MAX_TIME_REACHED. Event File was 6.7 MB and contained
>
> > 1626 events.
> > >>
> > >>>>> 2021-08-11 13:31:28,208 INFO [pool-22-thread-1]
>
> > >>>>> o.a.n.wali.SequentialAccessWriteAheadLog Checkpointed
>
> > Write-Ahead
> > >> Log
> > >>>> with
> > >>>>> 10 Records and 0 Swap Files in 8 milliseconds (Stop-the-world
>
> >
> > >> time =
> > >>>> 1
> > >>>>> milliseconds), max Transaction ID 27772177643
> > >>>>> 2021-08-11 13:31:28,208 INFO [pool-22-thread-1]
>
> > >>>>> o.a.n.c.r.WriteAheadFlowFileRepository Successfully
>
> > checkpointed
> > >> FlowFile
> > >>>>
> > >>>>> Repository with 10 records in 8 milliseconds
> > >>>>> 2021-08-11 13:31:28,295 INFO [main-EventThread]
>
> > >>>>> o.a.c.f.state.ConnectionStateManager State change:
> SUSPENDED
> >
> > >>
> > >>>>> 2021-08-11 13:31:29,808 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer minSessionTimeout
>
> > set to
> > >> 4000
> > >>>>> 2021-08-11 13:31:29,809 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer maxSessionTimeout
>
> > set to
> > >> 40000
> > >>>>
> > >>>>> 2021-08-11 13:31:29,809 INFO [QuorumPeer[myid=1](plain=/0.0.0.0:2181)(secure=disabled)]
>
> >
> > >>
> > >>>>
> > >>>>> o.a.zookeeper.server.ZooKeeperServer Created server
>
> > with tickTime
> > >> 2000
> > >>>>
> > >>>>> minSessionTimeout 4000 maxSessionTimeout 40000
> datadir
> >
> > >>>>> /opt/nifi/logs/zookeeper/version-2 snapdir
> > >>>>> /opt/nifi/state/zookeeper/version-2
> > >>>>> 2021-08-11 13:31:32,291 INFO [main-EventThread]
>
> > >>>>> o.a.c.f.state.ConnectionStateManager State change:
> RECONNECTED
> >
> > >>
> > >>>>>
> > >>>>>
> > >>>>> ------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> >
> > >>
> > >>>>
> > >>>>>
> > >>>>> After that, the log continues with normal messages
> about
> > heartbeats
> > >>
> > >>>> and
> > >>>>> provenance events but no error occurs anymore.
> That
> > exactly
> > >> was the
> > >>>> time,
> > >>>>> the whole flow cut-off.
> > >>>>>
> > >>>>> I've got to add, that we've never experienced that
> flow
> > cut-off
> > >> behaviour
> > >>>>
> > >>>>> with version 1.12.1, but the zookeeper restarts
> occur
> > there
> > >> as well
> > >>>> and as
> > >>>>> often as seen above.
> > >>>>> But when first updating to version 1.13.2 back
> in June,
> > we experienced
> > >>
> > >>>>
> > >>>>> this flow cut-off multiple times beside the not
> working
> > load
> > >> balancing.
> > >>>>
> > >>>>> Back then I thought this was connected to each
> other,
> > but now
> > >> we had
> > >>>> a
> > >>>>> fully functional load balancing and the cut-off
> happened
> > nevertheless.
> > >>
> > >>>>
> > >>>>>
> > >>>>> I'm thankful for any hint. :)
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>
> > >>>
> > >>>
> > >>
> > >
> > >
> >
>
>
>