Nifi : Unable to elect cluster coordinator

vg27 — Tue, 22 Oct 2024 16:14:27 GMT

client asked us to use the common username and password kind of authority, instead of certificate based, so i re-created the NIFI components to private VM's NIFI nodes, using the https load balancer,

Burt now getting the different error:

2024-10-22 15:46:17,574 INFO [main] o.a.nifi.controller.StandardFlowService Connecting Node: 53.13.138.70:8443
2024-10-22 15:46:20,785 WARN [Heartbeat Monitor Thread-1] o.a.n.c.l.e.CuratorLeaderElectionManager Unable to determine leader for role 'Cluster Coordinator'; returning null
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /nifi/leaders/Cluster Coordinator
at org.apache.zookeeper.KeeperException.create(KeeperException.java:101)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:53)
at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:2480)
at org.apache.curator.framework.imps.GetChildrenBuilderImpl$3.call(GetChildrenBuilderImpl.java:235)
at org.apache.curator.framework.imps.GetChildrenBuilderImpl$3.call(GetChildrenBuilderImpl.java:228)
at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:88)
at org.apache.curator.framework.imps.GetChildrenBuilderImpl.pathInForeground(GetChildrenBuilderImpl.java:228)
at org.apache.curator.framework.imps.GetChildrenBuilderImpl.forPath(GetChildrenBuilderImpl.java:221)
at org.apache.curator.framework.imps.GetChildrenBuilderImpl.forPath(GetChildrenBuilderImpl.java:42)
at org.apache.curator.framework.recipes.locks.LockInternals.getSortedChildren(LockInternals.java:133)
at org.apache.curator.framework.recipes.locks.LockInternals.getParticipantNodes(LockInternals.java:119)
at org.apache.curator.framework.recipes.locks.InterProcessMutex.getParticipantNodes(InterProcessMutex.java:153)
at org.apache.curator.framework.recipes.leader.LeaderSelector.getLeader(LeaderSelector.java:321)
at org.apache.nifi.controller.leader.election.CuratorLeaderElectionManager.getLeader(CuratorLeaderElectionManager.java:288)
at org.apache.nifi.controller.leader.election.CuratorLeaderElectionManager$ElectionListener.verifyLeader(CuratorLeaderElectionManager.java:579)
at org.apache.nifi.controller.leader.election.CuratorLeaderElectionManager$ElectionListener.isLeader(CuratorLeaderElectionManager.java:533)
at org.apache.nifi.controller.leader.election.CuratorLeaderElectionManager$LeaderRole.isLeader(CuratorLeaderElectionManager.java:474)
at org.apache.nifi.controller.leader.election.CuratorLeaderElectionManager.isLeader(CuratorLeaderElectionManager.java:269)
at org.apache.nifi.cluster.coordination.node.NodeClusterCoordinator.isActiveClusterCoordinator(NodeClusterCoordinator.java:824)
at org.apache.nifi.cluster.coordination.heartbeat.AbstractHeartbeatMonitor.monitorHeartbeats(AbstractHeartbeatMonitor.java:132)
at org.apache.nifi.cluster.coordination.heartbeat.AbstractHeartbeatMonitor$1.run(AbstractHeartbeatMonitor.java:84)
at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
2024-10-22 15:46:20,788 INFO [Curator-ConnectionStateManager-0] o.a.n.c.l.e.CuratorLeaderElectionManager org.apache.nifi.controller.leader.election.CuratorLeaderElectionManager$ElectionListe
ner@58c1da45 Connection State changed to SUSPENDED

Based on the last recommendations from the below link i identified the state file directory instead of removing it, i rename that state file directory.

https://community.cloudera.com/t5/Support-Questions/Nifi-Unable-to-elect-cluster-coordinator/m-p/333527

Attaching the screenshot for your reference

********************************************************************************************************

providing the nifi properties file

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Core Properties #
nifi.flow.configuration.file=./conf/flow.xml.gz
nifi.flow.configuration.json.file=./conf/flow.json.gz
nifi.flow.configuration.archive.enabled=true
nifi.flow.configuration.archive.dir=./conf/archive/
nifi.flow.configuration.archive.max.time=30 days
nifi.flow.configuration.archive.max.storage=500 MB
nifi.flow.configuration.archive.max.count=
nifi.flowcontroller.autoResumeState=true
nifi.flowcontroller.graceful.shutdown.period=10 sec
nifi.flowservice.writedelay.interval=500 ms
nifi.administrative.yield.duration=30 sec
# If a component has no work to do (is "bored"), how long should we wait before checking again for work?
nifi.bored.yield.duration=10 millis
nifi.queue.backpressure.count=10000
nifi.queue.backpressure.size=1 GB

nifi.authorizer.configuration.file=./conf/authorizers.xml
nifi.login.identity.provider.configuration.file=./conf/login-identity-providers.xml
nifi.templates.directory=./conf/templates
nifi.ui.banner.text=
nifi.ui.autorefresh.interval=30 sec
nifi.nar.library.directory=./lib
nifi.nar.library.autoload.directory=./extensions
nifi.nar.working.directory=./work/nar/
nifi.documentation.working.directory=./work/docs/components
nifi.nar.unpack.uber.jar=false

####################
# State Management #
####################

####################
nifi.state.management.configuration.file=./conf/state-management.xml
# The ID of the local state provider
nifi.state.management.provider.local=local-provider
# The ID of the cluster-wide state provider. This will be ignored if NiFi is not clustered but must be populated if running in a cluster.
nifi.state.management.provider.cluster=zk-provider
# Specifies whether or not this instance of NiFi should run an embedded ZooKeeper server
nifi.state.management.embedded.zookeeper.start=false
# Properties file that provides the ZooKeeper properties to use if <nifi.state.management.embedded.zookeeper.start> is set to true
nifi.state.management.embedded.zookeeper.properties=./conf/zookeeper.properties

# Database Settings
nifi.database.directory=./database_repository

# Repository Encryption properties override individual repository implementation properties
nifi.repository.encryption.protocol.version=
nifi.repository.encryption.key.id=
nifi.repository.encryption.key.provider=
nifi.repository.encryption.key.provider.keystore.location=
nifi.repository.encryption.key.provider.keystore.password=

# FlowFile Repository
nifi.flowfile.repository.implementation=org.apache.nifi.controller.repository.WriteAheadFlowFileRepository
nifi.flowfile.repository.wal.implementation=org.apache.nifi.wali.SequentialAccessWriteAheadLog
nifi.flowfile.repository.directory=./flowfile_repository
nifi.flowfile.repository.checkpoint.interval=20 secs
nifi.flowfile.repository.always.sync=false
nifi.flowfile.repository.retain.orphaned.flowfiles=true

nifi.swap.manager.implementation=org.apache.nifi.controller.FileSystemSwapManager
nifi.queue.swap.threshold=20000

# Content Repository
nifi.content.repository.implementation=org.apache.nifi.controller.repository.FileSystemRepository
nifi.content.claim.max.appendable.size=50 KB
nifi.content.repository.directory.default=./content_repository
nifi.content.repository.archive.max.retention.period=7 days
nifi.content.repository.archive.max.usage.percentage=50%
nifi.content.repository.archive.enabled=true
nifi.content.repository.always.sync=false
nifi.content.viewer.url=../nifi-content-viewer/

# Provenance Repository Properties
nifi.provenance.repository.implementation=org.apache.nifi.provenance.WriteAheadProvenanceRepository

nifi.provenance.repository.implementation=org.apache.nifi.provenance.WriteAheadProvenanceRepository

# Persistent Provenance Repository Properties
nifi.provenance.repository.directory.default=./provenance_repository
nifi.provenance.repository.max.storage.time=30 days
nifi.provenance.repository.max.storage.size=10 GB
nifi.provenance.repository.rollover.time=10 mins
nifi.provenance.repository.rollover.size=100 MB
nifi.provenance.repository.query.threads=2
nifi.provenance.repository.index.threads=2
nifi.provenance.repository.compress.on.rollover=true
nifi.provenance.repository.always.sync=false
# Comma-separated list of fields. Fields that are not indexed will not be searchable. Valid fields are:
# EventType, FlowFileUUID, Filename, TransitURI, ProcessorID, AlternateIdentifierURI, Relationship, Details
nifi.provenance.repository.indexed.fields=EventType, FlowFileUUID, Filename, ProcessorID, Relationship
# FlowFile Attributes that should be indexed and made searchable. Some examples to consider are filename, uuid, mime.type
nifi.provenance.repository.indexed.attributes=
# Large values for the shard size will result in more Java heap usage when searching the Provenance Repository
# but should provide better performance
nifi.provenance.repository.index.shard.size=500 MB
# Indicates the maximum length that a FlowFile attribute can be when retrieving a Provenance Event from
# the repository. If the length of any attribute exceeds this value, it will be truncated when the event is retrieved.
nifi.provenance.repository.max.attribute.length=65536
nifi.provenance.repository.concurrent.merge.threads=2

# Volatile Provenance Respository Properties
nifi.provenance.repository.buffer.size=100000

# Component and Node Status History Repository
nifi.components.status.repository.implementation=org.apache.nifi.controller.status.history.VolatileComponentStatusRepository

# Volatile Status History Repository Properties
nifi.components.status.repository.buffer.size=1440
nifi.components.status.snapshot.frequency=1 min

# QuestDB Status History Repository Properties
nifi.status.repository.questdb.persist.node.days=14
nifi.status.repository.questdb.persist.component.days=3
nifi.status.repository.questdb.persist.location=./status_repository

# Site to Site properties
nifi.remote.input.host=nifinode1
nifi.remote.input.secure=true
nifi.remote.input.socket.port=10000
nifi.remote.input.http.enabled=true

nifi.remote.input.socket.port=10000
nifi.remote.input.http.enabled=true
nifi.remote.input.http.transaction.ttl=30 sec
nifi.remote.contents.cache.expiration=30 secs

# web properties #
#############################################

# For security, NiFi will present the UI on 127.0.0.1 and only be accessible through this loopback interface.
# Be aware that changing these properties may affect how your instance can be accessed without any restriction.
# We recommend configuring HTTPS instead. The administrators guide provides instructions on how to do this.

nifi.web.http.host=
nifi.web.http.port=
nifi.web.http.network.interface.default=

#############################################

nifi.web.https.host=53.13.138.70
nifi.web.https.port=8443
nifi.web.https.network.interface.default=
nifi.web.https.application.protocols=http/1.1
nifi.web.jetty.working.directory=./work/jetty
nifi.web.jetty.threads=200
nifi.web.max.header.size=16 KB
nifi.web.proxy.context.path=
nifi.web.proxy.host=20.61.182.212,20.61.182.212:8443
nifi.web.max.content.size=
nifi.web.max.requests.per.second=30000
nifi.web.max.access.token.requests.per.second=25
nifi.web.request.timeout=60 secs
nifi.web.request.ip.whitelist=
nifi.web.should.send.server.version=true
nifi.web.request.log.format=%{client}a - %u %t "%r" %s %O "%{Referer}i" "%{User-Agent}i"

# Filter JMX MBeans available through the System Diagnostics REST API
nifi.web.jmx.metrics.allowed.filter.pattern=

# Include or Exclude TLS Cipher Suites for HTTPS
nifi.web.https.ciphersuites.include=
nifi.web.https.ciphersuites.exclude=

# security properties #
nifi.sensitive.props.key=@Rfs]HjNl=r(z0&ocSsTrrR8rm?/7qMP
nifi.sensitive.props.key.protected=
nifi.sensitive.props.algorithm=NIFI_PBKDF2_AES_GCM_256

nifi.sensitive.props.key.protected=
nifi.sensitive.props.algorithm=NIFI_PBKDF2_AES_GCM_256
nifi.sensitive.props.additional.keys=

nifi.security.autoreload.enabled=false
nifi.security.autoreload.interval=10 secs
nifi.security.keystore=./conf/keystore.p12
nifi.security.keystoreType=PKCS12
nifi.security.keystorePasswd=6431841d70fcdad3ba0da5069d579e85
nifi.security.keyPasswd=6431841d70fcdad3ba0da5069d579e85
nifi.security.truststore=./conf/truststore.p12
nifi.security.truststoreType=PKCS12
nifi.security.truststorePasswd=b6575864ad763da046c01883ae06863c
nifi.security.user.authorizer=single-user-authorizer
nifi.security.allow.anonymous.authentication=false
nifi.security.user.login.identity.provider=single-user-provider
nifi.security.user.jws.key.rotation.period=PT1H
nifi.security.ocsp.responder.url=
nifi.security.ocsp.responder.certificate=

# OpenId Connect SSO Properties #
nifi.security.user.oidc.discovery.url=
nifi.security.user.oidc.connect.timeout=5 secs
nifi.security.user.oidc.read.timeout=5 secs
nifi.security.user.oidc.client.id=
nifi.security.user.oidc.client.secret=
nifi.security.user.oidc.preferred.jwsalgorithm=
nifi.security.user.oidc.additional.scopes=offline_access
nifi.security.user.oidc.claim.identifying.user=
nifi.security.user.oidc.fallback.claims.identifying.user=
nifi.security.user.oidc.claim.groups=groups
nifi.security.user.oidc.truststore.strategy=JDK
nifi.security.user.oidc.token.refresh.window=60 secs

# Apache Knox SSO Properties #
nifi.security.user.knox.url=
nifi.security.user.knox.publicKey=
nifi.security.user.knox.cookieName=hadoop-jwt
nifi.security.user.knox.audiences=

# SAML Properties #
nifi.security.user.saml.idp.metadata.url=
nifi.security.user.saml.sp.entity.id=
nifi.security.user.saml.identity.attribute.name=
nifi.security.user.saml.group.attribute.name=
nifi.security.user.saml.request.signing.enabled=false

nifi.security.user.saml.want.assertions.signed=true
nifi.security.user.saml.signature.algorithm=http://www.w3.org/2001/04/xmldsig-more#rsa-sha256
nifi.security.user.saml.authentication.expiration=12 hours
nifi.security.user.saml.single.logout.enabled=false
nifi.security.user.saml.http.client.truststore.strategy=JDK
nifi.security.user.saml.http.client.connect.timeout=30 secs
nifi.security.user.saml.http.client.read.timeout=30 secs

# Identity Mapping Properties #
# These properties allow normalizing user identities such that identities coming from different identity providers
# (certificates, LDAP, Kerberos) can be treated the same internally in NiFi. The following example demonstrates normalizing
# DNs from certificates and principals from Kerberos into a common identity string:
#
# nifi.security.identity.mapping.pattern.dn=^CN=(.*?), OU=(.*?), O=(.*?), L=(.*?), ST=(.*?), C=(.*?)$
# nifi.security.identity.mapping.value.dn=$1@$2
# nifi.security.identity.mapping.transform.dn=NONE
# nifi.security.identity.mapping.pattern.kerb=^(.*?)/instance@(.*?)$
# nifi.security.identity.mapping.value.kerb=$1@$2
# nifi.security.identity.mapping.transform.kerb=UPPER

# Group Mapping Properties #
# These properties allow normalizing group names coming from external sources like LDAP. The following example
# lowercases any group name.
#
# nifi.security.group.mapping.pattern.anygroup=^(.*)$
# nifi.security.group.mapping.value.anygroup=$1
# nifi.security.group.mapping.transform.anygroup=LOWER

# Listener Bootstrap properties #
# This property defines the port used to listen for communications from NiFi Bootstrap. If this property
# is missing, empty, or 0, a random ephemeral port is used.
nifi.listener.bootstrap.port=0

# cluster common properties (all nodes must have same values) #
nifi.cluster.protocol.heartbeat.interval=5 sec
nifi.cluster.protocol.heartbeat.missable.max=8
nifi.cluster.protocol.is.secure=true

# cluster node properties (only configure for cluster nodes) #
nifi.cluster.is.node=true
nifi.cluster.node.address=53.13.138.70
nifi.cluster.node.protocol.port=9991
nifi.cluster.node.protocol.max.threads=50
nifi.cluster.node.event.history.size=25

nifi.cluster.node.protocol.max.threads=50
nifi.cluster.node.event.history.size=25
nifi.cluster.node.connection.timeout=5 sec
nifi.cluster.node.read.timeout=5 sec
nifi.cluster.node.max.concurrent.requests=100
nifi.cluster.firewall.file=
nifi.cluster.flow.election.max.wait.time=1 mins
nifi.cluster.flow.election.max.candidates=

# cluster load balancing properties #
nifi.cluster.load.balance.host=53.13.138.70
nifi.cluster.load.balance.port=6342
nifi.cluster.load.balance.connections.per.node=1
nifi.cluster.load.balance.max.thread.count=8
nifi.cluster.load.balance.comms.timeout=30 sec

# zookeeper properties, used for cluster management #
nifi.zookeeper.connect.string=nifinode1:2181,nifinode2:2181
nifi.zookeeper.connect.timeout=10 secs
nifi.zookeeper.session.timeout=10 secs
nifi.zookeeper.root.node=/nifi
nifi.zookeeper.client.secure=false
nifi.zookeeper.security.keystore=
nifi.zookeeper.security.keystoreType=
nifi.zookeeper.security.keystorePasswd=
nifi.zookeeper.security.truststore=
nifi.zookeeper.security.truststoreType=
nifi.zookeeper.security.truststorePasswd=
nifi.zookeeper.jute.maxbuffer=

# Zookeeper properties for the authentication scheme used when creating acls on znodes used for cluster management
# Values supported for nifi.zookeeper.auth.type are "default", which will apply world/anyone rights on znodes
# and "sasl" which will give rights to the sasl/kerberos identity used to authenticate the nifi node
# The identity is determined using the value in nifi.kerberos.service.principal and the removeHostFromPrincipal
# and removeRealmFromPrincipal values (which should align with the kerberos.removeHostFromPrincipal and kerberos.removeRealmFromPrincipal
# values configured on the zookeeper server).
nifi.zookeeper.auth.type=
nifi.zookeeper.kerberos.removeHostFromPrincipal=
nifi.zookeeper.kerberos.removeRealmFromPrincipal=

# kerberos #
nifi.kerberos.krb5.file=

# kerberos service principal #
nifi.kerberos.service.principal=
nifi.kerberos.service.keytab.location=

# kerberos spnego principal #
nifi.kerberos.spnego.principal=
nifi.kerberos.spnego.keytab.location=
nifi.kerberos.spnego.authentication.expiration=12 hours

# external properties files for variable registry
# supports a comma delimited list of file locations
nifi.variable.registry.properties=

# analytics properties #
nifi.analytics.predict.enabled=false
nifi.analytics.predict.interval=3 mins
nifi.analytics.query.interval=5 mins
nifi.analytics.connection.model.implementation=org.apache.nifi.controller.status.analytics.models.OrdinaryLeastSquares
nifi.analytics.connection.model.score.name=rSquared
nifi.analytics.connection.model.score.threshold=.90

# runtime monitoring properties
nifi.monitor.long.running.task.schedule=
nifi.monitor.long.running.task.threshold=

# Enable automatic diagnostic at shutdown.
nifi.diagnostics.on.shutdown.enabled=false

# Include verbose diagnostic information.
nifi.diagnostics.on.shutdown.verbose=false

# The location of the diagnostics folder.
nifi.diagnostics.on.shutdown.directory=./diagnostics

# The maximum number of files permitted in the directory. If the limit is exceeded, the oldest files are deleted.
nifi.diagnostics.on.shutdown.max.filecount=10

# The diagnostics folder's maximum permitted size in bytes. If the limit is exceeded, the oldest files are deleted.
nifi.diagnostics.on.shutdown.max.directory.size=10 MB

# Performance tracking properties
## Specifies what percentage of the time we should track the amount of time processors are using CPU, reading from/writing to content repo, etc.
## This can be useful to understand which components are the most expensive and to understand where system bottlenecks may be occurring.
## The value must be in the range of 0 (inclusive) to 100 (inclusive). A larger value will produce more accurate results, while a smaller value may be
## less expensive to compute.
## Results can be obtained by running "nifi.sh diagnostics <filename>" and then inspecting the produced file.
nifi.performance.tracking.percentage=0

# NAR Provider Properties #
# These properties allow configuring one or more NAR providers. A NAR provider retrieves NARs from an external source
# and copies them to the directory specified by nifi.nar.library.autoload.directory.
#
# Each NAR provider property follows the format:
# nifi.nar.library.provider.<identifier>.<property-name>
#
# Each NAR provider must have at least one property named "implementation".
#
# Example HDFS NAR Provider:
# nifi.nar.library.provider.hdfs.implementation=org.apache.nifi.flow.resource.hadoop.HDFSExternalResourceProvider
# nifi.nar.library.provider.hdfs.resources=/path/to/core-site.xml,/path/to/hdfs-site.xml
# nifi.nar.library.provider.hdfs.storage.location=hdfs://hdfs-location
# nifi.nar.library.provider.hdfs.source.directory=/nars
# nifi.nar.library.provider.hdfs.kerberos.principal=nifi@NIFI.COM
# nifi.nar.library.provider.hdfs.kerberos.keytab=/path/to/nifi.keytab
# nifi.nar.library.provider.hdfs.kerberos.password=
#
# Example NiFi Registry NAR Provider:
# nifi.nar.library.provider.nifi-registry.implementation=org.apache.nifi.registry.extension.NiFiRegistryNarProvider
# nifi.nar.library.provider.nifi-registry.url=http://localhost:18080
~/

****************************************************************************************************

providing state-managment.xml

-->

</html>
<local-provider>
<id>local-provider</id>
<class>org.apache.nifi.controller.state.providers.local.WriteAheadLocalStateProvider</class>
<property name="Directory">./state/local</property>
<property name="Always Sync">false</property>
<property name="Partitions">16</property>
<property name="Checkpoint Interval">2 mins</property>
</local-provider>

<cluster-provider>
<id>zk-provider</id>
<class>org.apache.nifi.controller.state.providers.zookeeper.ZooKeeperStateProvider</class>
<property name="Connect String">nifinode1:2188, nifinode2:2188</property>
<property name="Root Node">/nifi</property>
<property name="Session Timeout">10 seconds</property>
<property name="Access Control">Open</property>
</cluster-provider>

******************************************************************************************************

Attaching the zokeeper properties

server.1=nifinode1:2888:3888;2181
server.2=nifinode2:2888:3888;2181

Request you to please check and update what i am missing, i am a new to an NIFI, so getting through many issues.

***********************************************************************************************

Also i getting login screen from the loadbalancer ip but unable to login with the generated username and password

can u please guide what will be the username here, we are not using any certficate currently

Re: Nifi : Unable to elect cluster coordinator

MattWho — Wed, 23 Oct 2024 13:02:18 GMT

@vg27

If you have a support contract with Cloudera, you could open a support case where someone could connect directly with you and assist you through your many issues.

------
1. As i have shared before, the Single-User providers are not designed with the intent of use in a NiFi clustered environment. They should only be used for standalone NiFi evaluation purposes. Once you start to get in to the more involved cluster based deployments, you need to use different providers for authentication and authorization. When using the single-user-provider for authentication, each node can create different credentials which will not work in a cluster environment.

For login based authentication, you should be using LDAP/AD (ldap-provider) or Kerberos (Kerberos-provider).

For authorization, you should be using the managed authorizer.

------

2. Are you still using your own generated keystore and truststore with your own created private and public certificates? Using the NiFi auto-generated keystore and truststore will also not support clustering well as each node will not have a common certificate authority.

-----
3. The "org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss" exception is an issue with with Zookeeper (ZK) Quorum. This error can happen if both you nodes are not fully up at time of exception and may also happen because you do not have proper quorum with your ZK. Quorum consists of and odd number of ZK hosts with min 3. Strongly encourage the use of an external ZK since anytime one of your nodes goes down, you'll lose access to both nodes.

-----
4. You are using an external https Load Balancer (LB) which means that sticky sessions (session affinity) must be setup since the user token issues when you login is only valid for use with the node that issued it. So if your LB directs you to node 1 that presents you with login UI, you enter credentials obtaining a user token from node 1, and your LB then redirects to node 2 to load UI, it will fail authentication on node 2 because the request includes the token only good for node 1.

-----
5. I see you are using a mix of hostnames and IP addresses in your NiFi configurations, so make sure that the node certificates include both as SAN entries to avoid issues.

-----

Please help our community thrive. If you found any of the suggestions/solutions provided helped you with solving your issue or answering your question, please take a moment to login and click "Accept as Solution" on one or more of them that helped.

Thank you,
Matt

question Re: Nifi : Unable to elect cluster coordinator in Support Questions

Nifi : Unable to elect cluster coordinator

Re: Nifi : Unable to elect cluster coordinator

Re: Nifi : Unable to elect cluster coordinator

Re: Nifi : Unable to elect cluster coordinator

Re: Nifi : Unable to elect cluster coordinator