public Set keys() {
    checkReadiness();
    checkForNoAccess();
    if (!restoreSetOperationTransactionBehavior) {
      discoverJTA();
    }
    return new EntriesSet(this, false, IteratorType.KEYS, false);
  }
Flavor of keys that will not do repeatable read

@since GemFire 5.5
geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java