@Override
        public Object call() throws Exception {
          Region r = getRootRegion().getSubregion(regionName);
          r.localDestroyRegion();
          return null;
        }
test that puts in a server are rejected when a remote VM crosses critical threshold
geode-core/src/distributedTest/java/org/apache/geode/cache/management/MemoryThresholdsOffHeapDUnitTest.java