Невозможно сохранить RDD[String] в виде текстового файла с помощью saveAsTextFile

Question

Когда я пытаюсь записать мой RDD в текстовый файл на HDFS, как показано ниже, я получаю сообщение об ошибке.

val rdd = sc.textFile("/user/hadoop/dxld801/test.txt")
val filtered = rdd.map({line=> line.replace("\\N","NULL")})
filtered.saveAsTextFile("hdfs:///user/hadoop/dxld801/test.txt")

Ошибка:

Вызывается: java.lang.RuntimeException: java.lang.ClassNotFoundException: класс org.apache.hadoop.mapred.DirectFileOutputCommitter не найден

Я использую все вышеперечисленное в спарк-оболочке, и моя версия спарк- версии 1.4.0

Это команда, которую я использую для запуска оболочки $SPARK_HOME/bin/spark-shell --packages com.databricks:spark-csv_2.10:1.2.0 --jars /home/hadoop/lib/native/hadoop-lzo-0.4.14.jar

Я пытался найти его в Google DirectFileOutputCommitter ", Но похоже, что этот класс вообще не существует в этом мире.

Трассировка:

java.lang.RuntimeException: java.lang.RuntimeException:
> java.lang.ClassNotFoundException: Class
> org.apache.hadoop.mapred.DirectFileOutputCommitter not found
>         at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1927)
>         at org.apache.hadoop.mapred.JobConf.getOutputCommitter(JobConf.java:722)
>         at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopFile$4.apply$mcV$sp(PairRDDFunctions.scala:983)
>         at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopFile$4.apply(PairRDDFunctions.scala:965)
>         at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopFile$4.apply(PairRDDFunctions.scala:965)
>         at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:148)
>         at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:109)
>         at org.apache.spark.rdd.RDD.withScope(RDD.scala:286)
>         at org.apache.spark.rdd.PairRDDFunctions.saveAsHadoopFile(PairRDDFunctions.scala:965)
>         at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopFile$1.apply$mcV$sp(PairRDDFunctions.scala:897)
>         at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopFile$1.apply(PairRDDFunctions.scala:897)
>         at org.apache.spark.rdd.PairRDDFunctions$$anonfun$saveAsHadoopFile$1.apply(PairRDDFunctions.scala:897)
>         at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:148)
>         at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:109)
>         at org.apache.spark.rdd.RDD.withScope(RDD.scala:286)
>         at org.apache.spark.rdd.PairRDDFunctions.saveAsHadoopFile(PairRDDFunctions.scala:896)
>         at org.apache.spark.rdd.RDD$$anonfun$saveAsTextFile$1.apply$mcV$sp(RDD.scala:1400)
>         at org.apache.spark.rdd.RDD$$anonfun$saveAsTextFile$1.apply(RDD.scala:1379)
>         at org.apache.spark.rdd.RDD$$anonfun$saveAsTextFile$1.apply(RDD.scala:1379)
>         at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:148)
>         at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:109)
>         at org.apache.spark.rdd.RDD.withScope(RDD.scala:286)
>         at org.apache.spark.rdd.RDD.saveAsTextFile(RDD.scala:1379)
>         at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:26)
>         at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:31)
>         at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:33)
>         at $iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:35)
>         at $iwC$$iwC$$iwC$$iwC.<init>(<console>:37)
>         at $iwC$$iwC$$iwC.<init>(<console>:39)
>         at $iwC$$iwC.<init>(<console>:41)
>         at $iwC.<init>(<console>:43)
>         at <init>(<console>:45)
>         at .<init>(<console>:49)
>         at .<clinit>(<console>)
>         at .<init>(<console>:7)
>         at .<clinit>(<console>)
>         at $print(<console>)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:606)
>         at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:1065)
>         at org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:1338)
>         at org.apache.spark.repl.SparkIMain.loadAndRunReq$1(SparkIMain.scala:840)
>         at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:871)
>         at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:819)
>         at org.apache.spark.repl.SparkILoop.reallyInterpret$1(SparkILoop.scala:857)
>         at org.apache.spark.repl.SparkILoop.interpretStartingWith(SparkILoop.scala:902)
>         at org.apache.spark.repl.SparkILoop.command(SparkILoop.scala:814)
>         at org.apache.spark.repl.SparkILoop.processLine$1(SparkILoop.scala:657)
>         at org.apache.spark.repl.SparkILoop.innerLoop$1(SparkILoop.scala:665)
>         at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$loop(SparkILoop.scala:670)
>         at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply$mcZ$sp(SparkILoop.scala:997)
>         at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945)
>         at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:945)
>         at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135)
>         at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$process(SparkILoop.scala:945)
>         at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:1059)
>         at org.apache.spark.repl.Main$.main(Main.scala:31)
>         at org.apache.spark.repl.Main.main(Main.scala)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:606)
>         at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:664)
>         at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:169)
>         at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:192)
>         at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:111)
>         at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala) Caused by: java.lang.RuntimeException:
> java.lang.ClassNotFoundException: Class
> org.apache.hadoop.mapred.DirectFileOutputCommitter not found
>         at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1895)
>         at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1919)
>         ... 68 more Caused by: java.lang.ClassNotFoundException: Class org.apache.hadoop.mapred.DirectFileOutputCommitter not found
>         at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1801)
>         at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1893)
>         ... 69 more

Может ли кто-нибудь помочь мне решить эту проблему?

Answer 1

Похоже, путь для сохранения местоположения "hdfs:///user/hadoop/dxld801/test.txt" неправильно. Так должно быть: "/user/hadoop/dxld801/test.txt" или же "hdfs://HOSTNAME:PORT/user/hadoop/dxld801/test.txt"

Также исправьте строку:rdd.map({line=> line.replace("\\N","NULL")})вrdd.map{line=> line.replace("\\N","NULL")}