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https://issues.apache.org/jira/browse/KAFKA-14553?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Arthur reopened KAFKA-14553:
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> RecordAccumulator hangs in infinite NOP loop
> --------------------------------------------
>
> Key: KAFKA-14553
> URL: https://issues.apache.org/jira/browse/KAFKA-14553
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 3.3.1
> Environment: - Spring Boot 3.0.1
> - Spring Cloud 2022.0.0
> Versions of dependencies are defined in boms of SB and SC:
> - micrometer-tracing-bridge-brave 1.0.0
> - zipkin-reporter-brave 2.16.3
> - zipkin-sender-kafka 2.16.3
> Reporter: Viczai Gábor
> Assignee: Luke Chen
> Priority: Minor
> Fix For: 3.4.0, 3.3.2
>
>
> *Summary:*
> There is an infinite loop in RecordAccumulator, if stickyBatchSize is
> configured to be 0 in BuiltinPartitioner.
> (Which is the default case when using KafkaSender's default Builder.)
> *Details:*
> The infinite loop is caused by this while:
> https://github.com/apache/kafka/blob/3.3.1/clients/src/main/java/org/apache/kafka/clients/producer/internals/RecordAccumulator.java#L293
> and this continue particularly:
> https://github.com/apache/kafka/blob/3.3.1/clients/src/main/java/org/apache/kafka/clients/producer/internals/RecordAccumulator.java#L316
> because the partitionChanged() call in the condition always return true if
> batchSize is 0.
> So program flow never reaches this point:
> https://github.com/apache/kafka/blob/3.3.1/clients/src/main/java/org/apache/kafka/clients/producer/internals/RecordAccumulator.java#L318
> Thus no span data sent to Kafka ever.
> The problematic line in partitionChanged() is when it calls an update on the
> BuiltInPartitioner:
> https://github.com/apache/kafka/blob/3.3.1/clients/src/main/java/org/apache/kafka/clients/producer/internals/RecordAccumulator.java#L242
> which in fact always updates the partition because of this condition:
> https://github.com/apache/kafka/blob/3.3.1/clients/src/main/java/org/apache/kafka/clients/producer/internals/BuiltInPartitioner.java#L218
> therefore the next confdition in RecordAccumulator will evaluate to true also:
> https://github.com/apache/kafka/blob/3.3.1/clients/src/main/java/org/apache/kafka/clients/producer/internals/RecordAccumulator.java#L243
> thus returning 'true' and forcing the 'continue' in the while(true) loop.
> *Suggested fix:*
> I think these conditions should be changed:
> https://github.com/apache/kafka/blob/3.3.1/clients/src/main/java/org/apache/kafka/clients/producer/internals/BuiltInPartitioner.java#L218
> The equal signs should be removed from the conditions:
> {code}if (producedBytes > stickyBatchSize && enableSwitch || producedBytes >
> stickyBatchSize * 2) {{code}
> (Btw: line 213 also needs this modification.)
> *Note:*
> The problem arises because KafkaSender sets the batchSize to 0.
> https://github.com/openzipkin/zipkin-reporter-java/blob/2.16.3/kafka/src/main/java/zipkin2/reporter/kafka/KafkaSender.java#L88
> *Workaround:*
> Simply set the batch size greater than zero.
> {code:java}@Configuration
> public class SenderConfiguration {
> @Bean
> KafkaSender kafkaSender() {
> Properties overrides = new Properties();
> overrides.put(ProducerConfig.BATCH_SIZE_CONFIG, 1);
> return KafkaSender.newBuilder()
> .bootstrapServers("localhost:9092")
> .topic("zipkin")
> .overrides(overrides)
> .build();
> }
> }{code}
> *Using:*
> - Spring Boot 3.0.1
> - Spring Cloud 2022.0.0
> pom.xml (fragment):
> {code:xml} <dependency>
> <groupId>org.springframework.boot</groupId>
> <artifactId>spring-boot-autoconfigure</artifactId>
> </dependency>
> <dependency>
> <groupId>org.springframework.boot</groupId>
> <artifactId>spring-boot-starter-actuator</artifactId>
> </dependency>
> <dependency>
> <groupId>io.micrometer</groupId>
> <artifactId>micrometer-registry-prometheus</artifactId>
> </dependency>
> <dependency>
> <groupId>io.micrometer</groupId>
> <artifactId>micrometer-tracing-bridge-brave</artifactId>
> </dependency>
> <dependency>
> <groupId>io.zipkin.reporter2</groupId>
> <artifactId>zipkin-reporter-brave</artifactId>
> </dependency>
> <dependency>
> <groupId>io.zipkin.reporter2</groupId>
> <artifactId>zipkin-sender-kafka</artifactId>
> </dependency>{code}
> Everything is on default settings, except a KafkaSender is explicitely
> created as illustrated above. (No autoconfiguration available for Kafka
> sender.)
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