Github user hsaputra commented on the pull request: https://github.com/apache/flink/pull/1221#issuecomment-145315514 Unfortunately looks like this patch does not take advantage of slf4j parameterized logging [1]. Either do like: log.info("=================================" + "\nTest " + description + " is running." + "\n--------------------------------------------------------------------------------"); or: log.info("===============================" + "\nTest {} is running." + "\n--------------------------------------------------------------------------------", description); [1] http://www.slf4j.org/faq.html#logging_performance
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