@Override
  public void notifyEvicted(EvictionDispatcher evictionDispatcher, boolean isProactiveEviction) {
    evictionDispatcher.notifyEvicted(this, isProactiveEviction);
  }
ORC cache uses this to store compressed length; buffer is cached uncompressed, but
the lookup is on compressed ranges, so we need to know this.
llap-server/src/java/org/apache/hadoop/hive/llap/cache/LlapDataBuffer.java