question Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster in Support Questions

ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

ururu — Thu, 17 Jan 2019 22:54:04 GMT

Hello,

I have enable kerberos on cluster. I can successfully connect to consumer through kafka-konsole-consumer.

But when i try to connect to topic through NiFi ConsumeKafka processor i have error:

WARN [Timer-Driven Process Thread-8] o.a.n.p.kafka.pubsub.ConsumeKafka_1_0 ConsumeKafka_1_0[id=504e5811-0168-1000-0000-000024c83cc5] Was interrupted while trying to communicate with Kafka with lease org.apache.nifi.processors.kafka.pubsub.ConsumerPool$SimpleConsumerLease@51911c24. Will roll back session and discard any partially received data.   WARN [kafka-kerberos-refresh-thread-nifi/*@*] o.a.k.c.security.kerberos.KerberosLogin [Principal=nifi/*@*]: TGT renewal thread has been interrupted and will exit.

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

ururu — Tue, 22 Jan 2019 22:34:01 GMT

I can't connect with --bootstrap-server key, only with --zookeeper works. Obviously "ConsumeKafka processor" use "bootstrap" mod.

Can i use zookeeper with "ConsumeKafka processor" or how can i debug why i can't to connect direct to broker?

kafka-console-consumer.sh --bootstrap-server server:6667 --topic test5 --from-beginning --security-protocol SASL_PLAINTEXT

don't work

kafka-console-consumer.sh --zookeeper server:2181--topic test5 --from-beginning --security-protocol SASL_PLAINTEXT

work fine

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

Shelton — Tue, 22 Jan 2019 23:18:23 GMT

@ Ruslan Fialkovsky

Is your nifi part of the kerberized cluster or is a separate HDF cluster? What are versions of the components NIF,HDP etc ?

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

ururu — Tue, 22 Jan 2019 23:23:45 GMT

@Geoffrey Shelton Okot

I use HDF on HDP as one cluster, yes is kerberized. Ambari-2.6.2.2, HDP-2.6.5, HDF-3.1.2.

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

Shelton — Wed, 23 Jan 2019 01:36:16 GMT

@ Ruslan Fialkovsky

Are you doing some lab, this looks familiar can you share the link, I want to see if I can reproduce it on my cluster?

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

ururu — Wed, 23 Jan 2019 02:21:17 GMT

@Geoffrey Shelton Okot

It's real case at my work. I configured Test cluster from Hortonworks documentation and everything works good but at the same time Development cluster with same configuration doesn't work and i don't understand why it is. I don't have lab or some special instruction but i can to show you anything my config files or screenshots. Is it maybe some problem with zookeeper?

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

Shelton — Wed, 23 Jan 2019 03:51:25 GMT

@ Ruslan Fialkovsky

Can you log on both cluster as zookeeper run kinit then

$ /usr/hdp/current/zookeeper-server/bin/zkCli.sh
[zk: localhost:2181(CONNECTED) 0] getAcl /config/topics

Compare the outputs there should be a difference between the 2 cluster

sample output

[zk: localhost:2181(CONNECTED) 1] getAcl /config/topics
'world,'anyone 
: r 
'sasl,'kafka 
: cdrwa

And on the other

[zk: localhost:2181(CONNECTED) 1] getAcl /config/topics 
'world,'anyone 
: cdrwa

If that's the case have a look at how to set the correct ACL for the /config/topics in this HCC document

Please let me know

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

ururu — Wed, 23 Jan 2019 14:44:04 GMT

@Geoffrey Shelton Okot

Working Test:

[zk: localhost:2181(CONNECTED) 0] getAcl /config/topics

'world,'anyone

: r

'sasl,'kafka

: cdrwa

[zk: localhost:2181(CONNECTED) 1]

Not working Dev:

[zk: localhost:2181(CONNECTED) 0] getAcl /config/topics

'world,'anyone

: cdrwa

[zk: localhost:2181(CONNECTED) 1]

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

Shelton — Wed, 23 Jan 2019 15:06:09 GMT

@ Ruslan Fialkovsky

Now you see that on DEV world: everyone has cdrwa while for kafka there is no entry so you will need to setAcl for kafka

 setAcl /config/topics world:anyone:cdrwa,sasl:kafka:cdrwa

Did you grasp how to use the using superDigest to become a Zookeeper superuser, that's like the zookeeper root user who can add/change the ACL's ,let me know if you need help on that.

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

ururu — Wed, 23 Jan 2019 15:47:19 GMT

@Geoffrey Shelton Okot

I set next acl on Dev cluster:

[zk: localhost:2181(CONNECTED) 1] getAcl /brokers
'world,'anyone
: cdrwa
'sasl,'kafka
: cdrwa
[zk: localhost:2181(CONNECTED) 2] getAcl /controller
'world,'anyone
: r
'sasl,'kafka
: cdrwa
[zk: localhost:2181(CONNECTED) 3] getAcl /config
'world,'anyone
: cdrwa
'sasl,'kafka
: cdrwa
[zk: localhost:2181(CONNECTED) 4] getAcl /config/topics
'world,'anyone
: cdrwa
'sasl,'kafka
: cdrwa

but kafka-console-consumer.sh --bootstrap-server still not work.

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

Shelton — Wed, 23 Jan 2019 16:19:49 GMT

@ Ruslan Fialkovsky

Can you compare these files on both cluster, if it doesn't exist on the DEV then create them with correct owner and privileges

Kafka

/etc/kafka/conf/kafka_client_jaas.conf 
/etc/kafka/conf/kafka_jaas.conf

Zookeeper

/etc/zookeeper/conf/zookeeper_jaas.conf
/etc/zookeeper/conf/zookeeper_client_jaas.conf

After updating these files restart the zk and Kafka and retry

HTH

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

ururu — Wed, 23 Jan 2019 16:44:19 GMT

@Geoffrey Shelton Okot

I compared files, yes their exists and the same.

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

ururu — Wed, 23 Jan 2019 17:45:31 GMT

@Geoffrey Shelton Okot

Can i remove zookeeper's trees? Will they be recreate after deleting with right permission?

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

Shelton — Wed, 23 Jan 2019 18:07:07 GMT

@ Ruslan Fialkovsky

Logon to Zk on DEV and PROD Check whether you have child znodes under

 ls /config/topics

Validate that you have Kerberos entries in /etc/nifi/conf/nifi_jaas.conf

example

NiFiClient { 
    com.sun.security.auth.module.Krb5LoginModule required 
    useKeyTab=true keyTab="/etc/security/keytabs/nifi.service.keytab" 
    storeKey=true 
    useTicketCache=false 
    principal="nifi/{kdc_host}@REALM"; 
}; 
RegistryClient { 
    com.sun.security.auth.module.Krb5LoginModule required 
    useKeyTab=true keyTab="/etc/security/keytabs/nifi.service.keytab" 
    storeKey=true 
    useTicketCache=false 
    principal="nifi/{kdc_host}@REALM";

Please revert

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

ururu — Wed, 23 Jan 2019 21:17:24 GMT

@Geoffrey Shelton Okot

Yes i have

ls /config/topics
[test1]

NiFiClient {
  com.sun.security.auth.module.Krb5LoginModule required
  useKeyTab=true
  keyTab="/etc/security/keytabs/nifi.service.keytab"
  storeKey=true
  useTicketCache=false
  principal="nifi/host@RAIFFEISEN.RU";
};
RegistryClient {
  com.sun.security.auth.module.Krb5LoginModule required
  useKeyTab=true
  keyTab="/etc/security/keytabs/nifi.service.keytab"
  storeKey=true
  useTicketCache=false
  principal="nifi/host@RAIFFEISEN.RU";

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

Shelton — Thu, 24 Jan 2019 00:55:14 GMT

@Ruslan Fialkovsky

I think the topics created before changing the ACL's don't inherit the permissions. From the znode entry, I see you have one topic called test.

To validate can you create a new topic and ensure you change them in your Nifi flow files and retest! Normally if you run rmr in zookeeper CLI the entry deleted should be created but I am not sure for Kafka topics.

Please revert

Re: ConsumeKafka processor's NiFi can't communicate with Kafka in kerberized cluster

ururu — Sat, 17 Aug 2019 21:58:08 GMT

@Geoffrey Shelton Okot

Thank you, you are right, the problem was really in zookeeper's acl.

I copied everything in "ZooKeeper directory" from Test cluster to Dev cluster and that was help. But i don't know what exactly permission affected it. Is something way to get list all acl permission by Zookeeper? I would like to compare it with all acl from both cluster.