我正在借助“”测试 Spark Streaming 应用程序com.holdenkarau.spark-测试基地" and 分级测试.
import com.holdenkarau.spark.testing.StreamingSuiteBase
import org.apache.spark.rdd.RDD
import org.scalatest.{ BeforeAndAfter, FunSuite }
class Test extends FunSuite with BeforeAndAfter with StreamingSuiteBase {
var delim: String = ","
before {
System.clearProperty("spark.driver.port")
}
test(“This Fails“) {
val source = scala.io.Source.fromURL(getClass.getResource(“/some_logs.csv"))
val input = source.getLines.toList
val rowRDDOut = Calculator.do(sc.parallelize(input)) //Returns DataFrame
val report: RDD[String] = rowRDDOut.map(row => new String(row.getAs[String](0) + delim + row.getAs[String](1))
source.close
}
}
我收到字段 ' 的序列化异常delim':
org.apache.spark.SparkException: Task not serializable
[info] at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:304)
[info] at org.apache.spark.util.ClosureCleaner$.org$apache$spark$util$ClosureCleaner$$clean(ClosureCleaner.scala:294)
[info] at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:122)
[info] at org.apache.spark.SparkContext.clean(SparkContext.scala:2055)
[info] at org.apache.spark.rdd.RDD$$anonfun$map$1.apply(RDD.scala:324)
[info] at org.apache.spark.rdd.RDD$$anonfun$map$1.apply(RDD.scala:323)
[info] at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:150)
[info] at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:111)
[info] at org.apache.spark.rdd.RDD.withScope(RDD.scala:316)
[info] at org.apache.spark.rdd.RDD.map(RDD.scala:323)
[info] ...
[info] Cause: java.io.NotSerializableException: org.scalatest.Assertions$AssertionsHelper
[info] Serialization stack:
[info] - object not serializable (class: org.scalatest.Assertions$AssertionsHelper, value: org.scalatest.Assertions$AssertionsHelper@78b339fa)
[info] - field (class: org.scalatest.FunSuite, name: assertionsHelper, type: class org.scalatest.Assertions$AssertionsHelper)
如果我用字符串值替换“delim”,它就可以正常工作。
val report: RDD[String] = rowRDDOut.map(row => new String(row.getAs[String](0) + “,” + row.getAs[String](1))
第一版和第二版有什么区别?
提前致谢!
问题不在于类型delim
(字符串)它是delim
本身。
尽量不要在你的外部定义变量test()
方法。如果你定义delm
在你的里面test
它应该有效。
test(“This Fails“) {
val delim = ","
...
}
现在,你可能会问为什么?好吧,当你参考delim
从外部作用域来看,Scala 会尝试将封闭对象组合在一起class Test
。该对象包含对org.scalatest.Assertions$AssertionsHelper
它不是可序列化的(请参阅您的堆栈跟踪)。
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