apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/config/BizConfig.java/BizConfig/namespaceValueLengthLimitOverride
class BizConfig:  public Map<Long, Integer> namespaceValueLengthLimitOverride() {
    String namespaceValueLengthOverrideString = getValue("namespace.value.length.limit.override");
    Map<Long, Integer> namespaceValueLengthOverride = Maps.newHashMap();
    if (!Strings.isNullOrEmpty(namespaceValueLengthOverrideString)) {
      namespaceValueLengthOverride =
          GSON.fromJson(namespaceValueLengthOverrideString, namespaceValueLengthOverrideTypeReference);
    }

    return namespaceValueLengthOverride;
  }