Apache Flink 1.52 Rowtime时间戳为null

Question

I am doing some query with the following code:

    env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
    DataStream<Row> ds = SourceHelp.builder().env(env).consumer010(MyKafka.builder().build().kafkaWithWaterMark2())
            .rowTypeInfo(MyRowType.builder().build().typeInfo())
            .build().source4();
    //,proctime.proctime,rowtime.rowtime
    String sql1 = "select a,b,max(rowtime)as rowtime from user_device group by a,b";
    DataStream<Row> ds2 = TableHelp.builder().tableEnv(tableEnv).tableName("user_device").fields("a,b,rowtime.rowtime")
            .rowTypeInfo(MyRowType.builder().build().typeInfo13())
            .sql(sql1).in(ds).build().result();

    ds2.print();
    // String sql2 = "select a,count(b) as b from user_device2 group by a";
    String sql2 = "select a,count(b) as b,HOP_END(rowtime,INTERVAL '5' SECOND,INTERVAL '30' SECOND) as c from user_device2 group by HOP(rowtime, INTERVAL '5' SECOND, INTERVAL '30' SECOND),a";
    DataStream<Row> ds3 = TableHelp.builder().tableEnv(tableEnv).tableName("user_device2").fields("a,b,rowtime.rowtime")
            .rowTypeInfo(MyRowType.builder().build().typeInfo14())
            .sql(sql2).in(ds2).build().result();

    ds3.print();
    env.execute("test");

note: For sql1, I use max function with rowtime, it is not working, and following Exception is thrown:

Exception in thread "main" org.apache.flink.runtime.client.JobExecutionException: java.lang.RuntimeException: Rowtime timestamp is null. Please make sure that a proper TimestampAssigner is defined and the stream environment uses the EventTime time characteristic. at org.apache.flink.runtime.minicluster.MiniCluster.executeJobBlocking(MiniCluster.java:625) at org.apache.flink.streaming.api.environment.LocalStreamEnvironment.execute(LocalStreamEnvironment.java:123) at com.aicaigroup.water.WaterTest.testRowtimeWithMoreSqls5(WaterTest.java:158) at com.aicaigroup.water.WaterTest.main(WaterTest.java:20) Caused by: java.lang.RuntimeException: Rowtime timestamp is null. Please make sure that a proper TimestampAssigner is defined and the stream environment uses the EventTime time characteristic. at DataStreamSourceConversion$24.processElement(Unknown Source) at org.apache.flink.table.runtime.CRowOutputProcessRunner.processElement(CRowOutputProcessRunner.scala:67) at org.apache.flink.streaming.api.operators.ProcessOperator.processElement(ProcessOperator.java:66) at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:558) at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:533) at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:513) at org.apache.flink.streaming.runtime.tasks.OperatorChain$BroadcastingOutputCollector.collect(OperatorChain.java:628) at org.apache.flink.streaming.runtime.tasks.OperatorChain$BroadcastingOutputCollector.collect(OperatorChain.java:581) at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:679) at org.apache.flink.streami ng.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:657) at org.apache.flink.streaming.api.operators.TimestampedCollector.collect(TimestampedCollector.java:51) at com.aicaigroup.TableHelp$1.processElement(TableHelp.java:42) at com.aicaigroup.TableHelp$1.processElement(TableHelp.java:39) at org.apache.flink.streaming.api.operators.ProcessOperator.processElement(ProcessOperator.java:66) at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:558) at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:533) at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:513) at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:679) at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOpe rator.java:657) at org.apache.flink.streaming.api.operators.StreamMap.processElement(StreamMap.java:41) at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:558) at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:533) at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:513) at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:679) at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:657) at org.apache.flink.streaming.api.operators.TimestampedCollector.collect(TimestampedCollector.java:51) at org.apache.flink.table.runtime.aggregate.GroupAggProcessFunction.processElement(GroupAggProcessFunction.scala:151) at org.apache.flink.table.runtime.aggregate.GroupAggProcessFunction.processElement(Gro upAggProcessFunction.scala:39) at org.apache.flink.streaming.api.operators.LegacyKeyedProcessOperator.processElement(LegacyKeyedProcessOperator.java:88) at org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:202) at org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:104) at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:306) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:703) at java.lang.Thread.run(Thread.java:748) 2018-09-17 09:51:53.679 [Kafka 0.10 Fetcher for Source: Custom Source -> Map -> from: (a, b, rowtime) -> select: (a, b, CAST(rowtime) AS rowtime) (2/8)] INFO oakafka.clients.consumer.internals.AbstractCoordinator - Discovered coordinator 172.16.11.91:9092 (id: 2147483647 rack: null) for group test.

then I tried to update sql1 like this "select a,b,rowtime from user_device", and it works. So how to fix the error? First sql should use group by, and second sql should use rowtime by timeWindow. 3QS

Answer 1

I started flink from 1.6 , meet the similar question like yours. Solved by the those steps :

• using assignTimestampsAndWatermarks , just use the default and normal implement BoundedOutOfOrdernessTimestampExtractor. You need write the extractTimestamp function to extract timestamp value and declare window interval in the constructor.
• append ,proctime.proctime,rowtime.rowtime at the end of fields (i'm using fromDataStream(Flink 1.6) to convert stream as table)
• if you want use the exist field as rowtime. for example, data source fields is "a,clicktime,c" , you can declare "a,clicktime.rowtime,c"

Wish it can help you.