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Add the kafka-basics module

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Ankur Mhatre
2026-08-29 09:47:25 +05:30
commit 3a682e496e
28 changed files with 1403 additions and 0 deletions
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71
kafka-basics/docs/output/effective-config.txt Normal file
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=== producer ===
property kafka-clients default set by Spring Boot
--------------------------------------------------------------------------------------------------------
acks all -
enable.idempotence true -
retries 2147483647 -
max.in.flight.requests.per.connection 5 -
linger.ms 5 -
batch.size 16384 -
compression.type none -
delivery.timeout.ms 120000 -
=== consumer ===
property kafka-clients default set by Spring Boot
--------------------------------------------------------------------------------------------------------
auto.offset.reset latest earliest
enable.auto.commit true -
max.poll.records 500 -
max.poll.interval.ms 300000 -
session.timeout.ms 45000 -
heartbeat.interval.ms 3000 -
isolation.level read_uncommitted read_uncommitted
partition.assignment.strategy [class org.apache.kafka.clients.consumer.RangeAssignor, class org.apache.kafka.clients.consumer.CooperativeStickyAssignor] -
=== listener container ===
=== listener container ===
ackMode BATCH
groupId orders-basic
concurrency
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 3.828 s -- in com.ankurm.kafkabasics.EffectiveConfigTest
[INFO] Running com.ankurm.kafkabasics.SerialisationTest
JacksonJsonSerializer -> {"orderId":"o-1","customerId":"c-1","amount":10.00,"placedAt":"2026-08-29T10:15:30Z"}
[INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.227 s -- in com.ankurm.kafkabasics.SerialisationTest
[INFO] Running com.ankurm.kafkabasics.KeysAndPartitionsTest
=== key -> partition, 3 partitions ===
key partition murmur2 & 0x7fffffff % 3 Math.abs(murmur2) % 3
o-1 0 0 0
o-2 0 0 2
o-3 1 1 1
o-4 1 1 1
o-5 2 2 0
o-6 1 1 1
2026-08-29T09:44:16.725+05:30 INFO 67 --- [kafka-basics] [ntainer#0-0-C-1] com.ankurm.kafkabasics.OrderConsumer : received orderId=o-1 partition=0 offset=0
2026-08-29T09:44:16.726+05:30 INFO 67 --- [kafka-basics] [ntainer#0-0-C-1] com.ankurm.kafkabasics.OrderConsumer : received orderId=o-2 partition=0 offset=1
2026-08-29T09:44:16.726+05:30 INFO 67 --- [kafka-basics] [ntainer#0-0-C-1] com.ankurm.kafkabasics.OrderConsumer : received orderId=o-1 partition=0 offset=2
2026-08-29T09:44:16.726+05:30 INFO 67 --- [kafka-basics] [ntainer#0-0-C-1] com.ankurm.kafkabasics.OrderConsumer : received orderId=o-3 partition=1 offset=0
2026-08-29T09:44:16.726+05:30 INFO 67 --- [kafka-basics] [ntainer#0-0-C-1] com.ankurm.kafkabasics.OrderConsumer : received orderId=o-4 partition=1 offset=1
2026-08-29T09:44:16.727+05:30 INFO 67 --- [kafka-basics] [ntainer#0-0-C-1] com.ankurm.kafkabasics.OrderConsumer : received orderId=o-6 partition=1 offset=2
2026-08-29T09:44:16.727+05:30 INFO 67 --- [kafka-basics] [ntainer#0-0-C-1] com.ankurm.kafkabasics.OrderConsumer : received orderId=o-5 partition=2 offset=0
2026-08-29T09:44:16.746+05:30 INFO 67 --- [kafka-basics] [ntainer#0-0-C-1] com.ankurm.kafkabasics.OrderConsumer : received orderId=e-1 partition=0 offset=3
2026-08-29T09:44:16.749+05:30 INFO 67 --- [kafka-basics] [ntainer#0-0-C-1] com.ankurm.kafkabasics.OrderConsumer : received orderId=e-2 partition=1 offset=3
[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.532 s -- in com.ankurm.kafkabasics.KeysAndPartitionsTest
[INFO] Running com.ankurm.kafkabasics.ManualAckTest
Bootstrap metadata: BootstrapMetadata(records=[ApiMessageAndVersion(FeatureLevelRecord(name='metadata.version', featureLevel=30) at version 0), ApiMessageAndVersion(FeatureLevelRecord(name='eligible.leader.replicas.version', featureLevel=1) at version 0), ApiMessageAndVersion(FeatureLevelRecord(name='group.version', featureLevel=1) at version 0), ApiMessageAndVersion(FeatureLevelRecord(name='share.version', featureLevel=1) at version 0), ApiMessageAndVersion(FeatureLevelRecord(name='streams.version', featureLevel=1) at version 0), ApiMessageAndVersion(FeatureLevelRecord(name='transaction.version', featureLevel=2) at version 0)], metadataVersionLevel=30, source=format command)
Formatting metadata directory /tmp/kafka-14668657738428164299/combined_0_0 with metadata.version 4.3-IV0.
2026-08-29T09:44:17.569+05:30 INFO 67 --- [kafka-basics] [ main] com.ankurm.kafkabasics.ManualAckTest : Starting ManualAckTest using Java 25.0.4.1 with PID 67 (started by tender-adoring-cori in /tmp/work/smd/kafka-basics)
2026-08-29T09:44:17.570+05:30 INFO 67 --- [kafka-basics] [ main] com.ankurm.kafkabasics.ManualAckTest : The following 1 profile is active: "test"
2026-08-29T09:44:17.780+05:30 INFO 67 --- [kafka-basics] [ main] com.ankurm.kafkabasics.ManualAckTest : Started ManualAckTest in 0.503 seconds (process running for 6.368)
2026-08-29T09:44:18.617+05:30 INFO 67 --- [kafka-basics] [ntainer#0-0-C-1] com.ankurm.kafkabasics.OrderConsumer : received orderId=o-1 partition=0 offset=0
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.919 s -- in com.ankurm.kafkabasics.ManualAckTest
[INFO]
[INFO] Results:
[INFO]
[INFO] Tests run: 8, Failures: 0, Errors: 0, Skipped: 0
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 9.869 s
[INFO] Finished at: 2026-08-29T09:44:20+05:30
[INFO] ------------------------------------------------------------------------

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kafka-basics/docs/output/key-to-partition.txt Normal file
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key partition murmur2 & 0x7fffffff % 3 Math.abs(murmur2) % 3
o-1 0 0 0
o-2 0 0 2
o-3 1 1 1
o-4 1 1 1
o-5 2 2 0
o-6 1 1 1

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kafka-basics/docs/output/serialised-payload.txt Normal file
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JacksonJsonSerializer -> {"orderId":"o-1","customerId":"c-1","amount":10.00,"placedAt":"2026-08-29T10:15:30Z"}

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kafka-basics/docs/output/tests.txt Normal file
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Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 3.828 s -- in com.ankurm.kafkabasics.EffectiveConfigTest
Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.227 s -- in com.ankurm.kafkabasics.SerialisationTest
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.532 s -- in com.ankurm.kafkabasics.KeysAndPartitionsTest
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.919 s -- in com.ankurm.kafkabasics.ManualAckTest