Viktor Kolomeyko 505ade9c86
ENT-6388: Eliminate usage of Mina's ConcurrentHashSet (#6977)
* ENT-6388: Eliminate usage of Mina's `ConcurrentHashSet`

* ENT-6388: Restrict to `MutableSet<ScheduledStateRef>`
2021-12-02 13:24:11 +00:00
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