Create Kafka Multi Node, Multi Broker Cluster

Kafka MultiNode - MultiBroker Cluster.md

How to create a MultiNode - MultiBroker Cluster for Kafka on AWS

PreRequisites :

1. Kafka Binary files : http://kafka.apache.org/downloads.html

2. Atleast 2 AWS machines : AWS EMR or EC2 will be preferable

3. A Kafka Manager Utility to watch up the Cluster : https://cwiki.apache.org/confluence/display/KAFKA/Ecosystem

Installation

1. Now first download the kafka Tarball or binaries on your AWS instances and extract them

   tar -xzvf kafka_2.10-0.8.2.1.tgz mv kafka_2.10-0.8.2.1 kafka

2. On Both the Instances, you only need two properties to be changed i.e. zookeeper.properties & server.properties

a) Going with the first one edit "zookeeper.properties" on both the instances to

vi ~/kafka/config/zookeeper.properties
clientPort=2080 #Changing the Port from default "2181" to "2080"
server.1=ec2-<IP1>.amazonaws.com:2888:3888
server.2=ec2-<IP2>.amazonaws.com:2888:3888
#add here more servers if you want
initLimit=5
syncLimit=2

b) Now edit both instances "server.properties" and update the following this

vi ~/kafka/config/server.properties
broker.id=1 
port=9092
host.name=ec2-<IP1>.amazonaws.com #for 2nd EC2 instance it'll be "ec2-<IP2>.amazonaws.com"
num.partitions=4
zookeeper.connect=ec2-<IP1>.amazonaws.com:2080,ec2-<IP2>.amazonaws.com:2080 #Add all the Instances here for each Instance

3. After this go to the /tmp of every instance and create following things :

   cd /tmp/ mkdir zookeeper #Zookeeper temp dir cd zookeeper touch myid #Zookeeper temp file echo '1' >> myid #Add Server ID for Respective Instances i.e. "server.1 and server.2 etc"

4. Now all is done, Need to start zookeeper and kafka-server on both instances

   ##Start on both Instances

   ~/kafka/bin/zookeeper-server-start.sh ~/kafka/config/zookeeper.properties

   ~/kafka/bin/kafka-server-start.sh ~/kafka/config/server.properties

5. Now go to KafkaTool and add both of your AWS instances, You'll see multi brokers with multple partitions in it.

Post your questions here for more help

thank you for this very good post. I have couple of questions here.

1. I installed kafka with 3 brokers by ambari.
2. I have few zookeeper.properties and server.properties files on these 3 servers.
   /etc/kafka/conf.backup/zookeeper.properties
   /etc/kafka/2.5.5.0-157/0/zookeeper.properties
   /usr/hdp/2.5.5.0-157/etc/kafka/conf.default/zookeeper.properties
3. I guess is should be --> /usr/hdp/2.5.5.0-157/etc/kafka/conf.default/zookeeper.properties --> please confirm it.

For the server.propertied, I have these files on these 3 broker machines
4. /etc/kafka/conf.backup/server.properties
/etc/kafka/2.5.5.0-157/0/server.properties
/usr/hdp/2.5.5.0-157/etc/kafka/conf.default/server.properties
5. I guess is should be --> /usr/hdp/2.5.5.0-157/etc/kafka/conf.default/server.properties -- please confirm it
6. finally, what is the relationship between these zookeepers on broker server and zookeeper on the maters servers? kafka zookeeper seemed have its won dormitory, these zookeeper still work with other zookeepers in the cluster?

your post is very detailed, learned so much from it.
thank you for your help.

I have figured out the file I need to modify, however, when I start zookeeper-server-start.sh, I got an error:
Invalid config, exiting abnormally (org.apache.zookeeper.server.quorum.QuorumPeerMain)
org.apache.zookeeper.server.quorum.QuorumPeerConfig$ConfigException:
any ideas? please help.

hi, at your step #5, you said "Now go to KafkaTool and add both of your AWS instances, You'll see multi brokers with multple partitions in it."
I had a different approach, I have installed kafka with 3 brokers on which zookeepers already installed, then I came back to following your steps to configure, you think this would make difference? this would cause my errors I have here? Invalid config, exiting abnormally (org.apache.zookeeper.server.quorum.QuorumPeerMain)

please respond.
thank you so much for your help.

please discard all my questions, I fixed it.
thanks,

Trying to configure multinode instance using the steps mentioned however i am getting below error :
"Invalid config, exiting abnormally"

ubuntu@kafka2:~/kafka/kafka_2.11-1.0.0$ bin/zookeeper-server-start.sh config/zookeeper.properties
[2018-01-04 11:50:07,623] INFO Reading configuration from: config/zookeeper.properties (org.apache.zookeeper.server.quorum.QuorumPeerConfig)
[2018-01-04 11:50:07,647] INFO Resolved hostname: x.x.x.189 to address: /x.x.x.189 (org.apache.zookeeper.server.quorum.QuorumPeer)
[2018-01-04 11:50:07,647] INFO Resolved hostname: x.x.x.231 to address: /x.x.x.231 (org.apache.zookeeper.server.quorum.QuorumPeer)
[2018-01-04 11:50:07,647] WARN No server failure will be tolerated. You need at least 3 servers. (org.apache.zookeeper.server.quorum.QuorumPeerConfig)
[2018-01-04 11:50:07,648] ERROR Invalid config, exiting abnormally (org.apache.zookeeper.server.quorum.QuorumPeerMain)
org.apache.zookeeper.server.quorum.QuorumPeerConfig$ConfigException: Error processing config/zookeeper.properties
at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:154)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:101)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
Caused by: java.lang.IllegalArgumentException: initLimit is not set
at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parseProperties(QuorumPeerConfig.java:355)
at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:150)
... 2 more
Invalid config, exiting abnormally

Here is my zookeeper.properties file:
https://pastebin.com/zzQ3cUSD
i also created myid file inside the datadir and gave the server id (231 and 189 respectively in both the servers)

@Tiyadong How did you fix it? i am getting the exact same error.

Notice the message: "You need at least 3 servers." An odd number of zookeeper servers is recommended.

@avinash-mishra I fixed it with having correct Inbound rule specified in Security Group attached to the EC2, while accessing internally and not over internet.

Why do you need to specify '2888:3888' in zookeeper.properties for server.1 and server.2 ?

Hi @avinash-mishra I'm also getting the same error.

[2022-07-02 10:27:51,573] WARN Cannot open channel to 2 at election address ip-172-31-39-106.ap-south-1.compute.internal/172.31.39.106:3888 (org.apache.zookeeper.server.quorum.QuorumCnxManager) java.net.ConnectException: Connection refused (Connection refused) at java.base/java.net.PlainSocketImpl.socketConnect(Native Method) at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399) at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242) at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224) at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.base/java.net.Socket.connect(Socket.java:609) at org.apache.zookeeper.server.quorum.QuorumCnxManager.initiateConnection(QuorumCnxManager.java:383) at org.apache.zookeeper.server.quorum.QuorumCnxManager$QuorumConnectionReqThread.run(QuorumCnxManager.java:457) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:829)
Please let me know how you resolved this.