我正在使用Spark搜索二级排序并找到了这个解决方案:
case class RFMCKey(cId: String, R: Double, F: Double, M: Double, C: Double)
class RFMCPartitioner(partitions: Int) extends Partitioner {
require(partitions >= 0, "Number of partitions ($partitions) cannot be negative.")
override def numPartitions: Int = partitions
override def getPartition(key: Any): Int = {
val k = key.asInstanceOf[RFMCKey]
k.cId.hashCode() % numPartitions
}
}
object RFMCKey {
implicit def orderingBycId[A <: RFMCKey] : Ordering[A] = {
Ordering.by(k => (k.R, k.F * -1, k.M * -1, k.C * -1))
}
}
现在这是我用于RFMC(新近度,频率,货币,群体)计划的代码。 在相同的代码中,最后,我正在做:
val rfmcTableSorted = rfmcTable.repartitionAndSortWithinPartitions(new RFMCPartitioner(1))
但是当我在spark-shell
中加载此文件时,我收到以下错误:
<console>:130: error: RFMCKey is already defined as (compiler-generated) case class companion object RFMCKey
object RFMCKey {
^
<console>:198: error: RFMCKey.type does not take parameters
case (custId, (((rVal, fVal), mVal),cVal)) => (RFMCKey(custId, rVal, fVal, mVal, cVal), rVal+","+fVal+","+mVal+","+cVal)
^
<console>:200: error: value repartitionAndSortWithinPartitions is not a member of org.apache.spark.rdd.RDD[Nothing]
val rfmcTableSorted = rfmcTable.repartitionAndSortWithinPartitions(new RFMCPartitioner(1)).cache()
如何规避这个问题?
更新1
我尝试更改我的case类和对象类的声明顺序,并且令人惊讶的是shell加载了文件而没有抛出任何错误。但是当我运行我的程序时,它抛出了一个新的错误:
org.apache.spark.SparkException: Task not serializable
at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:166)
at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:158)
at org.apache.spark.SparkContext.clean(SparkContext.scala:1623)
at org.apache.spark.rdd.RDD.map(RDD.scala:286)
at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$rfmc$.constructRFMC(<console>:113)
at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:36)
at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:41)
at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:43)
at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:45)
at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:47)
at $iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:49)
at $iwC$$iwC$$iwC$$iwC.<init>(<console>:51)
at $iwC$$iwC$$iwC.<init>(<console>:53)
at $iwC$$iwC.<init>(<console>:55)
at $iwC.<init>(<console>:57)
at <init>(<console>:59)
at .<init>(<console>:63)
at .<clinit>(<console>)
at .<init>(<console>:7)
at .<clinit>(<console>)
at $print(<console>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:1065)
at org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:1338)
at org.apache.spark.repl.SparkIMain.loadAndRunReq$1(SparkIMain.scala:840)
at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:871)
at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:819)
at org.apache.spark.repl.SparkILoop.reallyInterpret$1(SparkILoop.scala:856)
at org.apache.spark.repl.SparkILoop.interpretStartingWith(SparkILoop.scala:901)
at org.apache.spark.repl.SparkILoop.command(SparkILoop.scala:813)
at org.apache.spark.repl.SparkILoop.processLine$1(SparkILoop.scala:656)
at org.apache.spark.repl.SparkILoop.innerLoop$1(SparkILoop.scala:664)
at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$loop(SparkILoop.scala:669)
at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply$mcZ$sp(SparkILoop.scala:996)
at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:944)
at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:944)
at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135)
at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$process(SparkILoop.scala:944)
at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:1058)
at org.apache.spark.repl.Main$.main(Main.scala:31)
at org.apache.spark.repl.Main.main(Main.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:569)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:166)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:189)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:110)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.io.NotSerializableException: $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$rfmc$
Serialization stack:
- object not serializable (class: $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$rfmc$, value: $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$rfmc$@757fc606)
- field (class: $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$rfmc$$anonfun$17, name: $outer, type: class $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$rfmc$)
- object (class $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$rfmc$$anonfun$17, <function1>)
at org.apache.spark.serializer.SerializationDebugger$.improveException(SerializationDebugger.scala:38)
at org.apache.spark.serializer.JavaSerializationStream.writeObject(JavaSerializer.scala:47)
at org.apache.spark.serializer.JavaSerializerInstance.serialize(JavaSerializer.scala:80)
at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:164)
... 52 more
更新2
我定义对象和函数的方式是这样的:
object rfmc {
def constructrfmc() = {
// Everything goes inside including the custom key and partitioner
// code defined above
}
}
更新3
我在eclipse中定义代码的方式非常有效:
object rfmc extends App {
// Everything goes inside including the custom key and partitioner
// code defined above
}
我还为此代码创建了一个JAR,并使用spark-submit
运行,这也非常有效。
答案 0 :(得分:1)
要解决RFMCKey
已定义的问题,您需要按照this issue中的说明交换案例类和对象声明的顺序。
关于您的更新,spark-shell
可能存在一些限制,无法执行任何任意代码(例如使用累加器)。要更深入地了解序列化机制,您应该传递以下选项-Dsun.io.serialization.extendedDebugInfo=true
。请记住,由于REPL,而不是一个应该广泛用于测试代码的完全成熟的生产就绪实用程序,spark-shell更像是一种探索性实用程序,可以迭代地测试小部分代码或新功能。
这里最安全的选择是将您的应用打包到一个jar中并在standalone mode中设置Spark,并使用您的打包jar运行spark-submit
。如您帖子的更新3和4中所反映的那样,您需要更新代码以将其包装到对象中,以便它成为您作业的入口点。这将使您能够确保您的代码没有错误。