Jackie-Jiang commented on issue #363: Fix the race condition while Helix refresh cluster status cache. URL: https://github.com/apache/helix/pull/363#issuecomment-516543932 > > There are two ways of solving the race condition by using atomic operations, either use ConcurrentHashMap or AtomicBoolean. If you decide to use AtomicBoolean, then you don't need the heavy-weight ConcurrentHashMap. I would recommend using array and use ChangeType.ordinal() as the index, or some immutable data structure to hold the AtomicBooleans > > Great suggestion. I thought about it too, it's vulnerable when putting the data in Map. ConcurrentHashMap obviously is relatively overkill. My suggestion is to use Enum and put AtomicBoolean as the internal field of the enum. Enum is singleton object, so I don't think it is feasible to put the change state as an internal field
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