diff --git a/test/java/spark/src/test/resources/log4j.properties b/test/java/spark/src/test/resources/log4j.properties
index d74e3fa39..8944c5d6c 100644
--- a/test/java/spark/src/test/resources/log4j.properties
+++ b/test/java/spark/src/test/resources/log4j.properties
@@ -11,6 +11,10 @@ log4j.appender.console.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p %c{1}:
 log4j.logger.org.apache.spark=WARN
 log4j.logger.org.apache.hadoop=WARN
 log4j.logger.seaweed=INFO
+# Enable DEBUG for SeaweedFS client to see file size calculations
+log4j.logger.seaweedfs.client.SeaweedRead=DEBUG
+log4j.logger.seaweedfs.client.SeaweedOutputStream=DEBUG
+log4j.logger.seaweedfs.client.SeaweedInputStream=DEBUG
 
 # Suppress Parquet verbose DEBUG logging
 log4j.logger.org.apache.parquet=ERROR