sbt run --input=stuff.log
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August 16, 2017 11:06
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Buggy reduce in scio
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import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility | |
import com.fasterxml.jackson.annotation.PropertyAccessor | |
import com.fasterxml.jackson.databind.{DeserializationFeature, ObjectMapper, SerializationFeature} | |
import com.fasterxml.jackson.module.scala.DefaultScalaModule | |
import com.fasterxml.jackson.module.scala.experimental.ScalaObjectMapper | |
import com.spotify.scio.ContextAndArgs | |
import com.spotify.scio.values.WindowOptions | |
import org.apache.beam.sdk.io.TextIO.CompressionType | |
import org.apache.beam.sdk.transforms.windowing.AfterProcessingTime | |
import org.apache.beam.sdk.values.WindowingStrategy.AccumulationMode | |
import org.joda.time.Duration | |
object LateReduceExample { | |
case class Stuff(val name: String, val value: Int) | |
case class StuffKey(val name: String) | |
def mapper = { | |
val mapper = new ObjectMapper() with ScalaObjectMapper | |
mapper.registerModule(DefaultScalaModule) | |
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false) | |
mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false) | |
mapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY) | |
mapper | |
} | |
def main(cmdlineArgs: Array[String]): Unit = { | |
val (sc, args) = ContextAndArgs(cmdlineArgs) | |
val windowDuration = Duration.standardSeconds(args.int("statsAggWindowDuration", 10)) | |
val allowedLateness = Duration.standardSeconds(args.int("allowedLateness", 1)) | |
val logFeed = sc.textFile(args("input"), CompressionType.UNCOMPRESSED) | |
.map { l => mapper.readValue[Stuff](l) } //TMEvents | |
.withFixedWindows( | |
windowDuration, | |
options = WindowOptions( | |
trigger = AfterProcessingTime.pastFirstElementInPane(), | |
accumulationMode = AccumulationMode.DISCARDING_FIRED_PANES, | |
allowedLateness = allowedLateness // Any allowed lateness fires empty windows and makes the reducers bug in scio | |
) | |
) | |
.map { s => (StuffKey(s.name), s.value) } | |
.reduceByKey(_ + _) | |
val result = sc.close() | |
result.waitUntilDone() | |
} | |
} |
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{"name": "a", "value": 1} | |
{"name": "b", "value": 1} | |
{"name": "a", "value": 3} | |
{"name": "c", "value": 2} | |
{"name": "b", "value": 5} |
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