@Override
  public boolean mustEvict(EvictionCounters counters, InternalRegion region, int delta) {
    return counters.getCounter() + delta > counters.getLimit();
  }
compute the size of storing a key/value pair in the cache..
geode-core/src/main/java/org/apache/geode/internal/cache/eviction/MemoryLRUController.java