读accumlator JobManager 在job finish的时候会汇总accumulator的值, newJobStatus match { case JobStatus.FINISHED => try { val accumulatorResults = executionGraph.getAccumulatorsSerialized() val result = new SerializedJobExecutionResult( jobID, jobInfo.duration,…
https://ci.apache.org/projects/flink/flink-docs-release-0.10/apis/programming_guide.html Example Program 编程的风格和spark很类似, ExecutionEnvironment -- SparkContext DataSet – RDD Transformations 这里用Java的接口,所以传入function需要用FlatMapFunction类对象 public clas…
在WindowedStream上可以执行,如reduce,aggregate,min,max等操作 关键是要理解windowOperator对KVState的运用,因为window是用它来存储window buffer的 采用不同的KVState,会有不同的效果,如ReduceState,ListState Reduce /** * Applies the given window function to each window. The window function is calle…
// This example implements the asynchronous request and callback with Futures that have the // interface of Java 8's futures (which is the same one followed by Flink's Future) /** * An implementation of the 'AsyncFunction' that sends requests and set…