@Override
  public void notifyProactiveEvictionMark() {
    if (realPolicy instanceof ProactiveEvictingCachePolicy) {
      ((ProactiveEvictingCachePolicy) realPolicy).notifyProactiveEvictionMark();
    }
  }
Constructs a String by pretty printing a TagState instance - for Web UI consumption.
Note: does not lock on TagState instance.
@param state
@return
llap-server/src/java/org/apache/hadoop/hive/llap/cache/CacheContentsTracker.java