Rajini Sivaram created KAFKA-6415:
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Summary: KafkaLog4jAppender deadlocks when logging from producer
network thread
Key: KAFKA-6415
URL: https://issues.apache.org/jira/browse/KAFKA-6415
Project: Kafka
Issue Type: Bug
Components: log
Reporter: Rajini Sivaram
Fix For: 1.1.0
If a log entry in producer network thread in the metadata update path is
appended to a Kafka topic using KafkaLog4jAppender, a new send is initiated
from the network thread which cannot complete since the metadata wait triggered
by the new send from the network thread waits for metadata from the network
thread, resulting in a deadlock.
This was probably the case right from the beginning when KafkaLog4jAppender was
introduced, but did not cause any issues so far since there were only debug log
entries in that path which were not logged to a Kafka topic by any of the
tests. A recent info level log entry introduced by the commit
https://github.com/apache/kafka/commit/a3aea3cf4dbedb293f2d7859e0298bebc8e2185f
is causing system test failures in log4j_appender_test.py due to the deadlock.
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