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