@Override
        public void run() {
          if (PROACTIVE_EVICTION_SWEEPER_EXECUTOR != null) {
            PROACTIVE_EVICTION_SWEEPER_EXECUTOR.shutdownNow();
          }
        }
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