Created
August 1, 2017 21:52
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Combine.perKey lifting test
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import com.spotify.scio._ | |
import org.slf4j.Logger | |
import org.slf4j.LoggerFactory | |
object SlowFanOutThenCombine { | |
val LOG: Logger = LoggerFactory.getLogger(this.getClass) | |
def slowFanOut(n: Int): Iterator[(Int, (Int, Int))] = new Iterator[(Int, (Int, Int))] { | |
var i: Int = 0 | |
override def hasNext: Boolean = i < 40 | |
override def next(): (Int, (Int, Int)) = { | |
i += 1 | |
Thread.sleep(1000) | |
LOG.info(s"Emit ($n, $i)") | |
(n, (n, i)) | |
} | |
} | |
def seqOp(acc: (Int, Int), x: (Int, Int)): (Int, Int) = { | |
LOG.info(s"Seq $acc, $x") | |
(acc._1.max(x._1), acc._2 + x._2) | |
} | |
def combOp(x: (Int, Int), y: (Int, Int)): (Int, Int) = { | |
LOG.info(s"Comb $x, $y") | |
(x._1.max(y._1), x._2 + y._2) | |
} | |
def main(cmdlineArgs: Array[String]): Unit = { | |
val (sc, _) = ContextAndArgs(cmdlineArgs) | |
val f = | |
sc.parallelize(1 to 8) | |
.flatMap(slowFanOut) | |
.aggregateByKey((0, 0))(seqOp, combOp) | |
.materialize | |
sc.close() | |
for (t <- f.waitForResult().value) { | |
println(t) | |
} | |
} | |
} |
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