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https://issues.apache.org/jira/browse/KAFKA-16283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17819428#comment-17819428
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ASF GitHub Bot commented on KAFKA-16283:
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showuon closed pull request #585: KAFKA-16283: notify users about
RoundRobinPartitioner bug
URL: https://github.com/apache/kafka-site/pull/585
> RoundRobinPartitioner will only send to half of the partitions in a topic
> -------------------------------------------------------------------------
>
> Key: KAFKA-16283
> URL: https://issues.apache.org/jira/browse/KAFKA-16283
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 3.1.0, 3.0.0, 3.6.1
> Reporter: Luke Chen
> Priority: Major
>
> When using `org.apache.kafka.clients.producer.RoundRobinPartitioner`, we
> expect data are sent to all partitions in round-robin manner. But we found
> there are only half of the partitions got the data. This causes half of the
> resources(storage, consumer...) are wasted.
> {code:java}
> > bin/kafka-topics.sh --create --topic quickstart-events4 --bootstrap-server
> > localhost:9092 --partitions 2
> Created topic quickstart-events4.
> # send 1000 records to the topic, expecting 500 records in partition0, and
> 500 records in partition1
> > bin/kafka-producer-perf-test.sh --topic quickstart-events4 --num-records
> > 1000 --record-size 1024 --throughput -1 --producer-props
> > bootstrap.servers=localhost:9092
> > partitioner.class=org.apache.kafka.clients.producer.RoundRobinPartitioner
> 1000 records sent, 6535.947712 records/sec (6.38 MB/sec), 2.88 ms avg
> latency, 121.00 ms max latency, 2 ms 50th, 7 ms 95th, 10 ms 99th, 121 ms
> 99.9th.
> > ls -al /tmp/kafka-logs/quickstart-events4-1
> total 24
> drwxr-xr-x 7 lukchen wheel 224 2 20 19:53 .
> drwxr-xr-x 70 lukchen wheel 2240 2 20 19:53 ..
> -rw-r--r-- 1 lukchen wheel 10485760 2 20 19:53 00000000000000000000.index
> -rw-r--r-- 1 lukchen wheel 1037819 2 20 19:53 00000000000000000000.log
> -rw-r--r-- 1 lukchen wheel 10485756 2 20 19:53
> 00000000000000000000.timeindex
> -rw-r--r-- 1 lukchen wheel 8 2 20 19:53 leader-epoch-checkpoint
> -rw-r--r-- 1 lukchen wheel 43 2 20 19:53 partition.metadata
> # No records in partition 1
> > ls -al /tmp/kafka-logs/quickstart-events4-0
> total 8
> drwxr-xr-x 7 lukchen wheel 224 2 20 19:53 .
> drwxr-xr-x 70 lukchen wheel 2240 2 20 19:53 ..
> -rw-r--r-- 1 lukchen wheel 10485760 2 20 19:53 00000000000000000000.index
> -rw-r--r-- 1 lukchen wheel 0 2 20 19:53 00000000000000000000.log
> -rw-r--r-- 1 lukchen wheel 10485756 2 20 19:53
> 00000000000000000000.timeindex
> -rw-r--r-- 1 lukchen wheel 0 2 20 19:53 leader-epoch-checkpoint
> -rw-r--r-- 1 lukchen wheel 43 2 20 19:53 partition.metadata
> {code}
> Tested in kafka 3.0.0, 3.2.3, and the latest trunk, they all have the same
> issue. It should already exist for a long time.
>
> Had a quick look, it's because we will abortOnNewBatch each time when new
> batch created.
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