@Override
    public BlockPriority getBlockPriority() {
      // This does not appear to be used in any meaningful way and is irrelevant to this cache
      return BlockPriority.MEMORY;
    }
Records an eviction. The number of eviction operations and evicted blocks are identical, as an
eviction is triggered immediately when the capacity has been exceeded. An eviction is performed
asynchronously. See the library's documentation for details on write buffers, batching, and
maintenance behavior.
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/TinyLfuBlockCache.java