public boolean __getBlockcache() {
    Object o = attrs.get(BLOCKCACHE);
    return o != null
      ? Boolean.parseBoolean(o.toString())
      : ColumnFamilyDescriptorBuilder.DEFAULT_BLOCKCACHE;
  }
Returns true if the BLOCKCACHE attribute is present and true
hbase-rest/src/main/java/org/apache/hadoop/hbase/rest/model/ColumnSchemaModel.java