public int __getBlocksize() {
    Object o = attrs.get(BLOCKSIZE);
    return o != null
      ? Integer.parseInt(o.toString())
      : ColumnFamilyDescriptorBuilder.DEFAULT_BLOCKSIZE;
  }
Returns the value of the BLOCKSIZE attribute or its default if it is unset
hbase-rest/src/main/java/org/apache/hadoop/hbase/rest/model/ColumnSchemaModel.java