protected InternalDistributedMember getDistributionManagerId() {
    Cache cache = getCache();
    DistributedSystem ds = cache.getDistributedSystem();
    return ((InternalDistributedSystem) ds).getDistributionManager().getId();
  }
Accessed via reflection. DO NOT REMOVE
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/CacheAdvisorDUnitTest.java