zentol commented on issue #7347: [FLINK-10761][metrics] Do not acquire lock for getAllVariables() URL: https://github.com/apache/flink/pull/7347#issuecomment-451193997 Well _performance_ of course. if no reporter is configured and the WebUI is not used we would spend memory on maps and strings that are never gonna be used. Personally I don't think this is worth the additional headache, but it is the conventions we went with since the metric system was added.
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