@Override
    public HFileBlock readBlock(long offset, long onDiskSize, boolean cacheBlock, boolean pread,
      boolean isCompaction, boolean updateCacheMetrics, BlockType expectedBlockType,
      DataBlockEncoding expectedDataBlockEncoding) throws IOException {
      return readBlock(offset, onDiskSize, cacheBlock, pread, isCompaction, updateCacheMetrics,
        expectedBlockType, expectedDataBlockEncoding, false);
    }
A wrapper around a block reader which only caches the results of the last operation. Not
thread-safe.
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileBlockIndex.java