[LOG4J2-2713] KafkaAppender discards all log from kafka-clients

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.12.1
• Component/s: Appenders
• Assignee: Unassigned
• Reporter: Clément MATHIEU
• Created: 23/Oct/19 13:49
• Updated: 23/Oct/19 13:49

Description

We have many applications which use both log4j's KafkaAppender and `kafka-clients` for their business logic. To prevent recursion, KafkaAppender implementation filters any LogEvent coming from the `org.apache.kafka` package. While healthy for log4j, it is annoying for regular Kafka usages. Would it be possible to improve this filtering? In synchronous case, shouldn't AppenderControl#callAppenderPreventRecursion prevent recursion? If smarter filtering is not possible, shouldn't log4j use a relocated kafka-clients impl to prevent such issue?