为ProcessWindowFunction

Question

问题

ProcessWindowFunction在不同的程序包中有何区别？何时何地使用哪个程序包？

• org.apache.flink.streaming.api.functions.windowing.ProcessWindowFunction
• org.apache.flink.streaming.api.scala.function.ProcessWindowFunction

对于Apache Flink: ProcessWindowFunction implementation中的窗口操作， org.apache.flink.streaming.api.scala 是正确的使用方法，但找不到Flink 1.8 API文档，仅针对1.3。

• Uses of Class org.apache.flink.streaming.api.scala.function.ProcessAllWindowFunction

如果我使用 org.apache.flink.streaming.api.functions.windowing.ProcessWindowFunction ，则会收到错误消息。

Error:(66, 20) type mismatch;
 found   : com.dataartisans.flinktraining.exercises.datastream_scala.windows.HourlyTipProcessFunction
 required: org.apache.flink.streaming.api.scala.function.ProcessWindowFunction[com.dataartisans.flinktraining.exercises.datastream_java.datatypes.TaxiFare,?,org.apache.flink.api.java.tuple.Tuple,org.apache.flink.streaming.api.windowing.windows.TimeWindow]
          .process(new HourlyTipProcessFunction())

环境

的Ubuntu

VERSION =“ 18.04.2 LTS（Bionic Beaver）”

pom.xml

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <slf4j.version>1.7.19</slf4j.version>
    <flink.version>1.8.0</flink.version>
    <scala.binary.version>2.12</scala.binary.version>
    <junit.version>4.12</junit.version>
</properties>

Answer 1

org.apache.flink.streaming.api.functions.windowing.ProcessWindowFunction是KeyedStreams上ProcessWindowFunctions的Java API类。

org.apache.flink.streaming.api.scala.function.ProcessWindowFunction相同，但适用于Scala API。

ProcessAllWindowFunction用于非键流上的Windows。