Kafka-Verifiable-Producer and Consumer Problem - apache-kafka

Question

I am doing experimenting with kafka. I already start the
kafka-console-producer and
kafka-console-consumer.
I send messages with kafka-producer and successfully receive at the kafka-console-consumer.
Now I want to produce and consume around 5000 messages at once. I look into documentation and get to know that there are two commands.
kafka-verifiable-producer.sh
kafka-verifiable-consumer.sh
I tried to use these commands .
kafka-verifiable-producer.sh --broker-list localhost:9092 --max-messages 5000 --topic data-sending
kafka-verifiable-consumer.sh --group-instance-id 1 --group-id data-world --topic data-sending --broker-list localhost:9092
The result is as follow
"timestamp":1581268289761,"name":"producer_send_success","key":null,"value":"4996","offset":44630,"topic":"try_1","partition":0}
{"timestamp":1581268289761,"name":"producer_send_success","key":null,"value":"4997","offset":44631,"topic":"try_1","partition":0}
{"timestamp":1581268289761,"name":"producer_send_success","key":null,"value":"4998","offset":44632,"topic":"try_1","partition":0}
{"timestamp":1581268289761,"name":"producer_send_success","key":null,"value":"4999","offset":44633,"topic":"try_1","partition":0}
{"timestamp":1581268289769,"name":"shutdown_complete"}
{"timestamp":1581268289771,"name":"tool_data","sent":5000,"acked":5000,"target_throughput":-1,"avg_throughput":5285.412262156448}
On the consumer console the result is as follow
{"timestamp":1581268089357,"name":"records_consumed","count":352,"partitions":[{"topic":"try_1","partition":0,"count":352,"minOffset":32777,"maxOffset":33128}]}
{"timestamp":1581268089359,"name":"offsets_committed","offsets":[{"topic":"try_1","partition":0,"offset":33129}],"success":true}
{"timestamp":1581268089384,"name":"records_consumed","count":500,"partitions":[{"topic":"try_1","partition":0,"count":500,"minOffset":33129,"maxOffset":33628}]}
{"timestamp":1581268089391,"name":"offsets_committed","offsets":[{"topic":"try_1","partition":0,"offset":33629}],"success":true}
{"timestamp":1581268089392,"name":"records_consumed","count":270,"partitions":[{"topic":"try_1","partition":0,"count":270,"minOffset":33629,"maxOffset":33898}]}
{"timestamp":1581268089394,"name":"offsets_committed","offsets":[{"topic":"try_1","partition":0,"offset":33899}],"success":true}
{"timestamp":1581268089415,"name":"records_consumed","count":500,"partitions":[{"topic":"try_1","partition":0,"count":500,"minOffset":33899,"maxOffset":34398}]}
{"timestamp":1581268089416,"name":"offsets_committed","offsets":[{"topic":"try_1","partition":0,"offset":34399}],"success":true}
{"timestamp":1581268089417,"name":"records_consumed","count":235,"partitions":[{"topic":"try_1","partition":0,"count":235,"minOffset":34399,"maxOffset":34633}]}
{"timestamp":1581268089419,"name":"offsets_committed","offsets":[{"topic":"try_1","partition":0,"offset":34634}],"success":true}
In above results, the key is null.
How i can send a bulk of messages with this command ?
I tried to look into one example how to use them but didn't found any. It produces integer number like values but where i can insert the messages?.
Is there any way i can use this command to produce messages in bulk? Also is it possible to implement such commands in windows or it is just for linux?
Any link to the examples would be greatly appreciated.

Answer 1

The script kafka-verifiable-producer.sh executes the classorg.apache.kafka.tools.VerifiableProducer.
(https://github.com/apache/kafka/blob/trunk/tools/src/main/java/org/apache/kafka/tools/VerifiableProducer.java)
Its program arguments --throughput, --repeating-keys and --value-prefix may fulfil your needs.
For example, the following produces messages with prefix value, 111 and with an incremental key which rotates for every 5 messages. You can also configure the throughput of the messages with the --throughput option. Int this example, it produces an average of 5 messages per second.
./kafka-verifiable-producer.sh --broker-list localhost:9092 --max-messages 10 --repeating-keys 5 --value-prefix 100 --throughput 5 --topic test
{"timestamp":1581271492652,"name":"startup_complete"}
{"timestamp":1581271492860,"name":"producer_send_success","key":"0","value":"100.0","offset":45,"topic":"test","partition":0}
{"timestamp":1581271492862,"name":"producer_send_success","key":"1","value":"100.1","offset":46,"topic":"test","partition":0}
{"timestamp":1581271493048,"name":"producer_send_success","key":"2","value":"100.2","offset":47,"topic":"test","partition":0}
{"timestamp":1581271493254,"name":"producer_send_success","key":"3","value":"100.3","offset":48,"topic":"test","partition":0}
{"timestamp":1581271493256,"name":"producer_send_success","key":"4","value":"100.4","offset":49,"topic":"test","partition":0}
{"timestamp":1581271493457,"name":"producer_send_success","key":"0","value":"100.5","offset":50,"topic":"test","partition":0}
{"timestamp":1581271493659,"name":"producer_send_success","key":"1","value":"100.6","offset":51,"topic":"test","partition":0}
{"timestamp":1581271493860,"name":"producer_send_success","key":"2","value":"100.7","offset":52,"topic":"test","partition":0}
{"timestamp":1581271494063,"name":"producer_send_success","key":"3","value":"100.8","offset":53,"topic":"test","partition":0}
{"timestamp":1581271494268,"name":"producer_send_success","key":"4","value":"100.9","offset":54,"topic":"test","partition":0}
{"timestamp":1581271494483,"name":"shutdown_complete"}
{"timestamp":1581271494484,"name":"tool_data","sent":10,"acked":10,"target_throughput":5,"avg_throughput":5.452562704471101}
The easiest is to modify/extend the above class If you are looking for more customized message keys and values.