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KAFKA-13761: KafkaLog4jAppender deadlocks when idempotence is enabled (#11939) 

When a log entry is appended to a Kafka topic using KafkaLog4jAppender, the producer.send operation
may hit a deadlock if the producer network thread also tries to append a log at the same log level.
This issue is triggered when idempotence is enabled for the KafkaLog4jAppender and the producer
tries to acquire the TransactionManager lock.

This is a temporary workaround to avoid deadlocks by disabling idempotence explicitly in
KafkaLog4jAppender.

Reviewers: Luke Chen <showuon@gmail.com>, Ismael Juma <ismael@juma.me.uk>
This commit is contained in:
Yang Yu 2022-03-24 08:36:56 -05:00 committed by GitHub
parent 12bb23157c
commit db724f23f3
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log4j-appender/src/main/java/org/apache/kafka/log4jappender/KafkaLog4jAppender.java
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@ -43,6 +43,7 @@ import static org.apache.kafka.clients.producer.ProducerConfig.LINGER_MS_CONFIG;
import static org.apache.kafka.clients.producer.ProducerConfig.MAX_BLOCK_MS_CONFIG;
import static org.apache.kafka.clients.producer.ProducerConfig.RETRIES_CONFIG;
import static org.apache.kafka.clients.producer.ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG;
import static org.apache.kafka.clients.producer.ProducerConfig.ENABLE_IDEMPOTENCE_CONFIG;
import static org.apache.kafka.common.config.SaslConfigs.SASL_JAAS_CONFIG;
import static org.apache.kafka.common.config.SaslConfigs.SASL_KERBEROS_SERVICE_NAME;
import static org.apache.kafka.common.config.SaslConfigs.SASL_MECHANISM;
@ -290,6 +291,9 @@ public class KafkaLog4jAppender extends AppenderSkeleton {
props.put(DELIVERY_TIMEOUT_MS_CONFIG, deliveryTimeoutMs);
props.put(LINGER_MS_CONFIG, lingerMs);
props.put(BATCH_SIZE_CONFIG, batchSize);
// Disable idempotence to avoid deadlock when the producer network thread writes a log line while interacting
// with the TransactionManager, see KAFKA-13761 for more information.
props.put(ENABLE_IDEMPOTENCE_CONFIG, false);
if (securityProtocol != null) {
props.put(SECURITY_PROTOCOL_CONFIG, securityProtocol);