void setDeserializerReference(CacheableDeserializer<Cacheable> deserializer) {
    this.deserializerIndex = (byte) deserializer.getDeserializerIdentifier();
  }
@param createRecycler used to free this {@link BucketEntry} when {@link BucketEntry#refCnt}
                      becoming 0. NOTICE that {@link ByteBuffAllocator#NONE} could only be used
                      for test.
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/BucketEntry.java