@Override
  public void cacheBlock(BlockCacheKey cacheKey, Cacheable cachedItem, boolean inMemory,
    boolean waitWhenCache) {
    cacheBlockWithWait(cacheKey, cachedItem, inMemory, waitWhenCache && queueAdditionWaitTime > 0);
  }
Cache the block with the specified name and buffer.
@param cacheKey   block's cache key
@param cachedItem block buffer
@param inMemory   if block is in-memory
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.java