Hello Flinksters,
I am trying to use Flinkspector in a Scala code snippet of mine and Flink
is complaining. The code is here:
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case class Reading(field1:String,field2:String,field3:Int)
object MultiWindowing {
def main(args: Array[String]) {}
// WindowFunction<IN,OUT,KEY,W extends Window>
class WindowPrinter extends WindowFunction[Reading, String, String,
TimeWindow] {
// .....
}
}
val env = DataStreamTestEnvironment.createTestEnvironment(1)
env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime)
val input: EventTimeInput[Reading] =
EventTimeInputBuilder
.startWith(Reading("hans", "elephant", 15))
.emit(Reading("susi", "arctic", 20), After.period(30, TimeUnit.SECONDS))
.emit(Reading("pete", "elephant", 40), After.period(20,
TimeUnit.SECONDS))
//acquire data source from input
val stream = env.fromInput(input)
//apply transformation
val k = stream.keyBy(new KeySelector [Reading,String] {
def getKey(r:Reading) = r.field2
})
.timeWindow(Time.of(5, TimeUnit.MINUTES), Time.of(1, TimeUnit.MINUTES))
k.sum(3)
.print()
env.execute()
}
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And at runtime, I get this error:
----------------------------------------------------------------------------------------------------------------
Exception in thread "main" java.lang.ExceptionInInitializerError
at
org.apache.flink.quickstart.StreamWindowExperiments.MultiWindowing.main(MultiWindowing.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: java.lang.IndexOutOfBoundsException: Not 0th field selected for
a simple type (non-tuple, non-array).
at
org.apache.flink.streaming.util.FieldAccessor.create(FieldAccessor.java:76)
at
org.apache.flink.streaming.api.functions.aggregation.SumAggregator.<init>(SumAggregator.java:37)
at
org.apache.flink.streaming.api.datastream.WindowedStream.sum(WindowedStream.java:373)
at
org.apache.flink.quickstart.StreamWindowExperiments.MultiWindowing$.<init>(MultiWindowing.scala:63)
at
org.apache.flink.quickstart.StreamWindowExperiments.MultiWindowing$.<clinit>(MultiWindowing.scala)
... 6 more
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Can someone help me by pointing out the mistake I am making?
-- Nirmalya
--
Software Technologist
http://www.linkedin.com/in/nirmalyasengupta
"If you have built castles in the air, your work need not be lost. That is
where they should be.
Now put the foundation under them."
