Small Mirror Maker test between different Kafka clusters

Hi,

Today i am trying to show you what i have been playing with for the last day. There was a business case in which some colleagues from Analytics wanted to replicate all the data from other systems in their cluster.

We will start with this, two independent configured clusters with 3 servers each (on each server we have one zookeeper and one kafka node). On both the source and target i created a topic replicated three times with five partitions. You can find the description

/opt/kafka/bin/kafka-topics.sh --zookeeper localhost:2181 --describe --topic test-topic
Topic:test-topic	PartitionCount:5	ReplicationFactor:3	Configs:
	Topic: test-topic	Partition: 0	Leader: 1002	Replicas: 1002,1003,1001	Isr: 1002,1003,1001
	Topic: test-topic	Partition: 1	Leader: 1003	Replicas: 1003,1001,1002	Isr: 1003,1001,1002
	Topic: test-topic	Partition: 2	Leader: 1001	Replicas: 1001,1002,1003	Isr: 1001,1002,1003
	Topic: test-topic	Partition: 3	Leader: 1002	Replicas: 1002,1001,1003	Isr: 1002,1001,1003
	Topic: test-topic	Partition: 4	Leader: 1003	Replicas: 1003,1002,1001	Isr: 1003,1002,1001

The command for creating this is actually pretty simple and it goes like this /opt/kafka/bin/kafka-topics.sh –zookeeper localhost:2181 –create –replication-factor 3 –partition 5 –topic test-topic

Once the topic are created on both kafka instances we will need to start Mirror Maker (HortonWorks recommends that the process should be created on the destination cluster). In order to do that, we will need to create two config files on the destination. You can call them producer.config and consumer.config.

For the consumer.config we have the following structure:

bootstrap.servers=source_node0:9092,source_node1:9092,source_node2:9092
exclude.internal.topics=true
group.id=test-consumer-group
client.id=mirror_maker_consumer

For the producer.config we have the following structure:

bootstrap.servers=destination_node0:9092,destination_node1:9092,destination_node2:9092
acks=1
batch.size=100
client.id=mirror_maker_producer

These are the principal requirements and also you will need to be sure that you have in you consumer.properties the following line group.id=test-consumer-group.

Ok, so far so good, now lets start Mirror Maker with and once started you can see it beside kafka and zookeeper using ps -ef | grep java

/opt/kafka/bin/kafka-run-class.sh kafka.tools.MirrorMaker --consumer.config ../config/consumer.config --producer.config ../config/producer.config --whitelist test-topic &

To check the offset, at new versions of kafka you can always use

/opt/kafka/bin# ./kafka-run-class.sh kafka.admin.ConsumerGroupCommand --group test-consumer-group --bootstrap-server localhost:9092 --describe
GROUP                          TOPIC                          PARTITION  CURRENT-OFFSET  LOG-END-OFFSET  LAG             OWNER
test-consumer-group            test-topic                     0          2003            2003            0               test-consumer-group-0_/[dest_ip]
test-consumer-group            test-topic                     1          2002            2002            0               test-consumer-group-0_/[dest_ip]
test-consumer-group            test-topic                     2          2003            2003            0               test-consumer-group-0_/[dest_ip]
test-consumer-group            test-topic                     3          2004            2004            0               test-consumer-group-0_/[dest_ip]
test-consumer-group            test-topic                     4          2002            2002            0               test-consumer-group-0_/[dest_ip]

I tested the concept by running a short loop in bash to create 10000 records and put them to a file for i in $( seq 1 10000); do echo $i; done >> test.txt  and this can be very easily imported on our producer by running the command /opt/kafka/bin/kafka-console-producer.sh –broker-list localhost:9092 –topic test-topic < test.txt

After this is finished, please feel free to take a look in the topic using /opt/kafka/bin/kafka-console-consumer.sh –bootstrap-server localhost:9092 –topic test-topic –from-beginning and you should see a lot of lines 🙂

Thank you for your time and if there are any parts that i missed, please reply.

Cheers!

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