Unable to start Control Center

[Sean Lindo]

Platform: Ubuntu 16.04

Installation Method: apt

Version: 3.2.2

Hello all,

I'm looking to trial the Enterprise Edition, but it doesn't appear I can actually start the control center. I've followed the instructions in the quickstart guide and have successfully produced and consumed messages from the command line. 

This is the command I'm using to start the control-center: 

/usr/bin/control-center-start /tmp/control-center.properties

And this is the repeating output I'm receiving from the terminal:

[2017-06-24 21:22:21,225] INFO unable to find enough working brokers (io.confluent.controlcenter.KafkaHelper:342)

I've confirmed that all services are running by switching screens and producing/consuming a few messages again. Is there something specific control-center is looking for? 

[Hans Jespersen]

How many Kafka brokers do you have? The default control center parameters tries to create topics with replication factor of 3 so it will only work (with defaults) with a cluster of 3 or more brokers.

The config file also has some lines that you can uncomment to make control center work with a single node kafka cluster.

[Sean Lindo]

I'm currently running only one broker. I'll look for those settings in the config file, thank you.

[Hans Jespersen]

This is my (working) config for a single node cluster.

confluent.controlcenter.internal.topics.partitions=1

confluent.controlcenter.internal.topics.replication=1

confluent.controlcenter.command.topic.replication=1

confluent.monitoring.interceptor.topic.partitions=1

confluent.monitoring.interceptor.topic.replication=1

Also don’t forget to turn on metrics reporting as well

confluent.monitoring.interceptor.topic=_confluent-monitoring

confluent.monitoring.interceptor.topic.partitions=12

-hans

On Jun 25, 2017, at 6:59 PM, Sean Lindo <lindo....@gmail.com> wrote:

I'm currently running only one broker. I'll look for those settings in the config file, thank you.

--
You received this message because you are subscribed to a topic in the Google Groups "Confluent Platform" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/confluent-platform/lfigaxTCnCI/unsubscribe.
To unsubscribe from this group and all its topics, send an email to confluent-platf...@googlegroups.com.
To post to this group, send email to confluent...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/confluent-platform/fd572aa1-78bd-40b9-ba91-1a2d96380132%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[Hari Charan]

Hi all,

I'm unable to start confluent control-center :( 

I'm using confluent-3.0.0, installed via yum. Error is as follows:

[2018-05-11 04:49:07,938] ERROR failed to create topic=_confluent-monitoring partitions=2 replication=2 minIsr=1 retention=259200000 (io.confluent.controlcenter.KafkaHelper:143)

kafka.admin.AdminOperationException: replication factor: 2 larger than available brokers: 0

        at kafka.admin.AdminUtils$.assignReplicasToBrokers(AdminUtils.scala:117)

        at kafka.admin.AdminUtils$.createTopic(AdminUtils.scala:403)

        at kafka.admin.AdminUtils.createTopic(AdminUtils.scala)

        at io.confluent.controlcenter.KafkaHelper$KafkaAdminUtils.createTopic(KafkaHelper.java:38)

        at io.confluent.controlcenter.KafkaHelper.checkCreateTopics(KafkaHelper.java:135)

        at io.confluent.controlcenter.ControlCenter.main(ControlCenter.java:94)

[2018-05-11 04:49:07,938] ERROR failed to create necessary topics (io.confluent.controlcenter.ControlCenter:104)

Although, when I check for available brokers in zkshell:

zookeeper-shell localhost:2181/kafka <<< "ls /brokers/ids"

Connecting to localhost:2181/kafka

Welcome to ZooKeeper!

JLine support is disabled

WATCHER::

WatchedEvent state:SyncConnected type:None path:null

[0, 1]

Kindly help, Thanks :)

[dan]

what version are your brokers? are you using any sort of security on your brokers?

dan

--
You received this message because you are subscribed to the Google Groups "Confluent Platform" group.
To unsubscribe from this group and stop receiving emails from it, send an email to confluent-platf...@googlegroups.com.

To post to this group, send email to confluent...@googlegroups.com.

To view this discussion on the web visit https://groups.google.com/d/msgid/confluent-platform/a54aa28c-53a1-4ee0-bd1a-f7f5fd56c471%40googlegroups.com.

[Robin Moffatt]

Is there a reason you are running 3.0? 4.1 is the latest, and can be obtained from https://www.confluent.io/download/

--