Armin Braun 1a21cc0357
Simplify and Fix Synchronization in InternalTestCluster (#39168) (#39241)
* Simplify and Fix Synchronization in InternalTestCluster (#39168)

* Remove unnecessary `synchronized` statements
* Make `Predicate`s constants where possible
* Cleanup some stream usage
* Make unsafe public methods `synchronized`
* Closes #37965
* Closes #37275
* Closes #37345
2019-02-21 16:27:18 +01:00
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