private HashSet<PersistentMemberID> getRemovedMembers() {
      synchronized (removedMembers) {
        return new HashSet<>(removedMembers);
      }
    }
Finish the atomic creation of this bucket on multiple members This method is called with the
proxy bucket synchronized.
geode-core/src/main/java/org/apache/geode/internal/cache/BucketPersistenceAdvisor.java