Github user justinleet commented on the issue:
https://github.com/apache/metron/pull/572
Can you use parameterized messages for the various log statements or
`logger.isDebugEnabled()`, rather than constructing the strings every time?
The common case is for this to not be run, so I'd rather not have this stuff
constructed to much. See: https://www.slf4j.org/faq.html#logging_performance
If I recall correctly, typically it's better to use parameterized messages
if it's just using the `toString()` of an object, and `logger.isDebugEnabled()`
if not (to avoid whatever calls are made). I'd have to double check that
though.
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