private static ScheduledExecutorService retrieveSweeperExecutor() throws Exception {
    Field sweeperExecutorField = ProactiveEvictingCachePolicy.Impl.class
        .getDeclaredField("PROACTIVE_EVICTION_SWEEPER_EXECUTOR");
    sweeperExecutorField.setAccessible(true);
    return (ScheduledExecutorService) sweeperExecutorField.get(null);
  }
Test cases for proactive LLAP cache eviction.
llap-server/src/test/org/apache/hadoop/hive/llap/cache/TestProactiveEviction.java