@Override
  public boolean nextStep() {
    if (satisfyRedundancy()) {
      return true;
    } else {
      model.waitForOperations();
      return satisfyRedundancy();
    }
  }
A director to create redundant copies for buckets that are low in redundancy level. This is most
commonly used as an element of the composite director.
geode-core/src/main/java/org/apache/geode/internal/cache/partitioned/rebalance/SatisfyRedundancy.java