Py4JJavaError：調用z：org.apache.spark.api.python.PythonRDD.runJob時發生錯誤

Question

我在運行Python 3.6.5的Jupyter筆記本和運行3.7.2的Python Shell中遇到此錯誤。 我的操作系統是Windows10。我在這兩種環境中都安裝了pippark pyspark。 兩者都使用Spark版本2.4.0，而我的Java JDK是Oracle JDK版本8，jdk1.8.0_201。 這是我在兩種情況下都運行的代碼：

>>> from pyspark import SparkConf, SparkContext
>>> conf = SparkConf().setAppName("app")
>>> sc = SparkContext(conf=conf)
>>> import os

>>> os.chdir("C:/Users/theca/Desktop/school_folders/Big Data")
>>> data = sc.textFile("post_codes.txt")
>>> data.take(1)

我正在使用JRE版本8，並驗證了JAVA_HOME：

C:\\Python\\Python37\\Scripts>echo %JAVA_HOME%

C:\\ProgramData\\Oracle\\Java\\javapath\\java.exe

我改用JDK認為可以解決此問題：

C:\\Program Files\\Java\\jdk1.8.0_201>setx JAVA_HOME "C:\\Program Files\\Java\\jdk1.8.0_201"

SUCCESS: Specified value was saved.

C:\\Program Files\\Java\\jdk1.8.0_201>setx PATH "%PATH%;%JAVA_HOME%\\bin";

WARNING: The data being saved is truncated to 1024 characters.

我退出了cmd，然后返回，驗證了我的Java主頁：

C:\\WINDOWS\\system32>echo %JAVA_HOME% C:\\Program Files\\Java\\jdk1.8.0_201

我在這里嘗試過解決方案： PySpark異常：Java網關進程在發送其端口號之前已退出

此處： Pyspark：Spyder中的SparkContext定義引發Java網關錯誤

以及此板上的其他一些答案。我想知道是否需要使用早期版本的spark？ 這是整個錯誤消息：

Traceback (most recent call last):
  File "<pyshell#9>", line 1, in <module>
    data.take(1)
  File "C:\Python\Python37\lib\site-packages\pyspark\rdd.py", line 1327, in take
    totalParts = self.getNumPartitions()
  File "C:\Python\Python37\lib\site-packages\pyspark\rdd.py", line 391, in getNumPartitions
    return self._jrdd.partitions().size()
  File "C:\Python\Python37\lib\site-packages\py4j\java_gateway.py", line 1257, in __call__
    answer, self.gateway_client, self.target_id, self.name)
  File "C:\Python\Python37\lib\site-packages\py4j\protocol.py", line 328, in get_return_value
    format(target_id, ".", name), value)
py4j.protocol.Py4JJavaError: An error occurred while calling o20.partitions.
: org.apache.hadoop.mapred.InvalidInputException: Input path does not exist: file:/C:/Python/Python37/post_codes.txt

at org.apache.hadoop.mapred.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:287)

at org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:229)

at org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:315)

at org.apache.spark.rdd.HadoopRDD.getPartitions(HadoopRDD.scala:204)

at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:253)

at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:251)

at scala.Option.getOrElse(Option.scala:121)

at org.apache.spark.rdd.RDD.partitions(RDD.scala:251)

at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:49)

at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:253)

at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:251)

at scala.Option.getOrElse(Option.scala:121)

at org.apache.spark.rdd.RDD.partitions(RDD.scala:251)

at org.apache.spark.api.java.JavaRDDLike$class.partitions(JavaRDDLike.scala:61)

at org.apache.spark.api.java.AbstractJavaRDDLike.partitions(JavaRDDLike.scala:45)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)

at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)

at py4j.Gateway.invoke(Gateway.java:282)

at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)

at py4j.commands.CallCommand.execute(CallCommand.java:79)

at py4j.GatewayConnection.run(GatewayConnection.java:238)

at java.lang.Thread.run(Thread.java:748)

Answer 1

請嘗試以下操作：

data = sc.textFile("file:///path to the file/")

這應該工作。