clintropolis commented on issue #7764: #7316 Use Map.putIfAbsent() instead of containsKey() + put() URL: https://github.com/apache/incubator-druid/pull/7764#issuecomment-496398848 > This is the line. Why should ConcurrentMap changed to ConcurrentHashMap type here ? This check was added in #6898, I think [maybe this comment](https://github.com/apache/incubator-druid/pull/6898#discussion_r249778280) is relevant to what it is trying to enforce.
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