Webb31 aug. 2024 · Only process functions can use side outputs (which you write to via ctx.output ). A MapFunction automatically sends the return value of its map method downstream (toward the sink). It works this way because a map is a one-to-one mapping from inputs to outputs. Most other function types (e.g., process functions, flatmaps) are … Webb1. 继承 `RichSinkFunction` 类,并实现 `invoke` 方法,在该方法中实现写入数据的逻辑; 2. 在 `open` 方法中初始化相关资源,在 `close` 方法中释放资源; 3. 在 `invoke` 方法中使用 `Context` 对象提供的 `collect` 方法将数据写入目标数据源中; 4.
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Webb25 okt. 2024 · 需要自定义RichSinkFunction(),仅在初始化时调用连接 二、Flink Window API 1. Window概念. 将无界数据流切分为有界数据流集进行处理,窗口(window)就是切分无界流的一种方式,将流数据分发到有限大小的桶(bucket)中进行分析。 Webb11 maj 2024 · The invoke () method of the handler will be called with three parameters: the proxy object itself (we can ignore it), the method invoked on the proxy and the … bomb driver headcover
PrintSinkFunction (flink 1.2-SNAPSHOT API) - The Apache …
Webb由于工作需要最近学习flink 现记录下Flink介绍和实际使用过程 这是flink系列的第五篇文章 自定义SinkSink介绍SinkFunction接口介绍RichSinkFunction类介绍Sink介绍 flink的sink是flink三大逻辑结构之一(source,transform,sink),… WebbDescription copied from interface: SinkFunction. Function for standard sink behaviour. This function is called for every record. Specified by: invoke in interface SinkFunction < IN >. … Webb21 apr. 2024 · 1 Answer Sorted by: 3 The constructor of a RichFunction is only invoked on client side. If something needs to be actually performed on the cluster, it should be done in open. open also needs to be used if you want to access parameters to your Flink job or RuntimeContext (for state, counters, etc.). bomb door view in grand theft auto v