@VisibleForTesting
  @Override
  public boolean isMarkedForEviction() {
    return State.hasFlags(state.get(), State.FLAG_MARKED);
  }
Marks this buffer as eligible for proactive eviction. No need to check refCount here.
@return buffer size
llap-server/src/java/org/apache/hadoop/hive/llap/cache/LlapAllocatorBuffer.java