Github user tedyu commented on the issue:
https://github.com/apache/spark/pull/21488
I tried the following change but didn't seem to get more output from Kafka:
```
diff --git a/external/kafka-0-10-sql/src/test/resources/log4j.properties
b/external/kafka-0-10-sql/src/test/resources/log4j.properties
index 75e3b53..0d65339 100644
--- a/external/kafka-0-10-sql/src/test/resources/log4j.properties
+++ b/external/kafka-0-10-sql/src/test/resources/log4j.properties
@@ -25,4 +25,4 @@ log4j.appender.file.layout.ConversionPattern=%d{yy/MM/dd
HH:mm:ss.SSS} %t %p %c{
# Ignore messages below warning level from Jetty, because it's a bit
verbose
log4j.logger.org.spark-project.jetty=WARN
-
+log4j.logger.org.apache.kafka=DEBUG
```
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