@Override
    public void notifyProactiveEvictionMark() {
      lastMarkTime.set(System.currentTimeMillis());
    }
Invoking this signals that new buffers have been marked for proactive eviction. Cache policies implementing this
need this information to correctly time sweep runs.
llap-server/src/java/org/apache/hadoop/hive/llap/cache/ProactiveEvictingCachePolicy.java