leventov commented on issue #7764: #7316 Use Map.putIfAbsent() instead of containsKey() + put() URL: https://github.com/apache/incubator-druid/pull/7764#issuecomment-496602694 @clintropolis the reference place with the explanation is now here: https://github.com/code-review-checklists/java-concurrency#chm-type
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