Question

我正尝试使用 NestedValueProvider ，就像Google云平台文档https://cloud.google.com/dataflow/docs/templates/creating-templates提供的示例一样，但是它抛出异常：无法序列化NestedValueProvider {value = RuntimeValueProvider {propertyName = date，default = null}，translator =}

@Description("Processing date")
@Validation.Required
ValueProvider<String> getDate();
void setDate(ValueProvider<String> date);

PCollectionTuple lines = this.p
                    .apply("ReadW2", TextIO.read().from(ValueProvider.NestedValueProvider.of(options.getDate(), new SerializableFunction<String, String>() {
                        @Override
                        public String apply(String date) {
                            return "gs://bucketname/" + date;
                        }
                    })))

Answer 1

现在它对我有用，但是我不明白为什么。我刚刚将匿名类转换为lambda表达式。

PCollectionTuple lines = this.p
                    .apply("ReadW2", TextIO.read().from(NestedValueProvider.of(options.getDate(), (SerializableFunction<String, String>) date -> gs://bucketname/" + date)))

NestedValueProvider问题

1 个答案: