Examples with ReduceFunction org.apache.flink.api.common.functions.ReduceFunction used on opensource projects

Example 26 with ReduceFunction

use of org.apache.flink.api.common.functions.ReduceFunction in project flink by apache.

the class TimestampITCase method testErrorOnEventTimeWithoutTimestamps.

@Test
public void testErrorOnEventTimeWithoutTimestamps() {
    StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
    env.setParallelism(2);
    DataStream<Tuple2<String, Integer>> source1 = env.fromElements(new Tuple2<>("a", 1), new Tuple2<>("b", 2));
    source1.keyBy(0).window(TumblingEventTimeWindows.of(Time.seconds(5))).reduce(new ReduceFunction<Tuple2<String, Integer>>() {

        @Override
        public Tuple2<String, Integer> reduce(Tuple2<String, Integer> value1, Tuple2<String, Integer> value2) {
            return value1;
        }
    }).print();
    try {
        env.execute();
        fail("this should fail with an exception");
    } catch (Exception e) {
    // expected
    }
}