@Override
    public BlockWithScanInfo loadDataBlockWithScanInfo(ExtendedCell key, HFileBlock currentBlock,
      boolean cacheBlocks, boolean pread, boolean isCompaction,
      DataBlockEncoding expectedDataBlockEncoding, CachingBlockReader cachingBlockReader)
      throws IOException {
      return seeker.loadDataBlockWithScanInfo(key, currentBlock, cacheBlocks, pread, isCompaction,
        expectedDataBlockEncoding, cachingBlockReader);
    }
Adds a new entry in the root block index. Only used when reading.
@param key      Last key in the block
@param offset   file offset where the block is stored
@param dataSize the uncompressed data size
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileBlockIndex.java