default boolean isMetaBlock(BlockType blockType) {
    return blockType != null && blockType.getCategory() != BlockType.BlockCategory.DATA;
  }
Check if block type is meta or index block
@param blockType block type of a given HFile block
@return true if block type is non-data block
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/BlockCache.java