sc = SparkContext（conf=conf）错误
使用anaconda的Jupyter笔记本，这是我第一次使用pyspark。 我想做的是定义 Spark 环境来读取本地磁盘上的 csv 文件。
编辑：添加了文本，因为 user2314737 要求提供文本而不是图像，现在 StackOverflow 希望我添加更多详细信息，因为我的文本正文主要是代码 XD，所以我必须在这部分与大家聊天，您可以忽略此文本正文，但我必须写，直到我可以按保存编辑。
输入：
from pyspark import SparkContext, SparkConf
conf = SparkConf().setAppName("PrdectiveModel")
sc = SparkContext(conf=conf) ----> the error is in this line
输出：
Py4JJavaError Traceback (most recent call last)
Input In [13], in <cell line: 3>()
1 from pyspark import SparkContext, SparkConf
2 conf = SparkConf().setAppName("PrdectiveModel")
----> 3 sc = SparkContext(conf=conf)
File E:\anaconda3\lib\site-packages\pyspark\context.py:146, in SparkContext.__init__(self, master, appName, sparkHome, pyFiles, environment, batchSize, serializer, conf, gateway, jsc, profiler_cls)
144 SparkContext._ensure_initialized(self, gateway=gateway, conf=conf)
145 try:
--> 146 self._do_init(master, appName, sparkHome, pyFiles, environment, batchSize, serializer,
147 conf, jsc, profiler_cls)
148 except:
149 # If an error occurs, clean up in order to allow future SparkContext creation:
150 self.stop()
File E:\anaconda3\lib\site-packages\pyspark\context.py:209, in SparkContext._do_init(self, master, appName, sparkHome, pyFiles, environment, batchSize, serializer, conf, jsc, profiler_cls)
206 self.environment["PYTHONHASHSEED"] = os.environ.get("PYTHONHASHSEED", "0")
208 # Create the Java SparkContext through Py4J
--> 209 self._jsc = jsc or self._initialize_context(self._conf._jconf)
210 # Reset the SparkConf to the one actually used by the SparkContext in JVM.
211 self._conf = SparkConf(_jconf=self._jsc.sc().conf())
File E:\anaconda3\lib\site-packages\pyspark\context.py:329, in SparkContext._initialize_context(self, jconf)
325 def _initialize_context(self, jconf):
326 """
327 Initialize SparkContext in function to allow subclass specific initialization
328 """
--> 329 return self._jvm.JavaSparkContext(jconf)
File E:\anaconda3\lib\site-packages\py4j\java_gateway.py:1585, in JavaClass.__call__(self, *args)
1579 command = proto.CONSTRUCTOR_COMMAND_NAME +\
1580 self._command_header +\
1581 args_command +\
1582 proto.END_COMMAND_PART
1584 answer = self._gateway_client.send_command(command)
-> 1585 return_value = get_return_value(
1586 answer, self._gateway_client, None, self._fqn)
1588 for temp_arg in temp_args:
1589 temp_arg._detach()
File E:\anaconda3\lib\site-packages\py4j\protocol.py:326, in get_return_value(answer, gateway_client, target_id, name)
324 value = OUTPUT_CONVERTER[type](answer[2:], gateway_client)
325 if answer[1] == REFERENCE_TYPE:
--> 326 raise Py4JJavaError(
327 "An error occurred while calling {0}{1}{2}.\n".
328 format(target_id, ".", name), value)
329 else:
330 raise Py4JError(
331 "An error occurred while calling {0}{1}{2}. Trace:\n{3}\n".
332 format(target_id, ".", name, value))
Py4JJavaError: An error occurred while calling None.org.apache.spark.api.java.JavaSparkContext.
: java.lang.NoClassDefFoundError: Could not initialize class org.apache.spark.storage.StorageUtils$
at org.apache.spark.storage.BlockManagerMasterEndpoint.<init>(BlockManagerMasterEndpoint.scala:110)
at org.apache.spark.SparkEnv$.$anonfun$create$9(SparkEnv.scala:348)
at org.apache.spark.SparkEnv$.registerOrLookupEndpoint$1(SparkEnv.scala:287)
at org.apache.spark.SparkEnv$.create(SparkEnv.scala:336)
at org.apache.spark.SparkEnv$.createDriverEnv(SparkEnv.scala:191)
at org.apache.spark.SparkContext.createSparkEnv(SparkContext.scala:277)
at org.apache.spark.SparkContext.<init>(SparkContext.scala:460)
at org.apache.spark.api.java.JavaSparkContext.<init>(JavaSparkContext.scala:58)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:247)
at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
at py4j.Gateway.invoke(Gateway.java:238)
at py4j.commands.ConstructorCommand.invokeConstructor(ConstructorCommand.java:80)
at py4j.commands.ConstructorCommand.execute(ConstructorCommand.java:69)
at py4j.ClientServerConnection.waitForCommands(ClientServerConnection.java:182)
at py4j.ClientServerConnection.run(ClientServerConnection.java:106)
at java.base/java.lang.Thread.run(Thread.java:833)
所以我按照你说的检查了环境等。 甚至使用findsprak
输入
import findspark
findspark.init()
findspark.find()
输出
'C:\\spark-3.2.1-bin-hadoop3.2'
因此它已正确安装并且可以毫无问题地导入。
还有！！！！！！！！！！！！我的错误仍然存在
sc = SparkContext(conf=conf)
为什么这一行会导致错误
..............
所以我尝试了不同的代码
import pyspark
from pyspark.sql import SparkSession
spark = SparkSession.builder.getOrCreate()
df = spark.sql("select 'spark' as hello ")
df.show()
现在出现了不同的错误
iRuntimeError Traceback (most recent call last)
Input In [6], in <cell line: 5>()
1 import pyspark
3 from pyspark.sql import SparkSession
----> 5 spark = SparkSession.builder.getOrCreate()
7 df = spark.sql("select 'spark' as hello ")
9 df.show()
File C:\spark-3.2.1-bin-hadoop3.2\python\pyspark\sql\session.py:228, in SparkSession.Builder.getOrCreate(self)
226 sparkConf.set(key, value)
227 # This SparkContext may be an existing one.
--> 228 sc = SparkContext.getOrCreate(sparkConf)
229 # Do not update `SparkConf` for existing `SparkContext`, as it's shared
230 # by all sessions.
231 session = SparkSession(sc)
File C:\spark-3.2.1-bin-hadoop3.2\python\pyspark\context.py:392, in SparkContext.getOrCreate(cls, conf)
390 with SparkContext._lock:
391 if SparkContext._active_spark_context is None:
--> 392 SparkContext(conf=conf or SparkConf())
393 return SparkContext._active_spark_context
File C:\spark-3.2.1-bin-hadoop3.2\python\pyspark\context.py:144, in SparkContext.__init__(self, master, appName, sparkHome, pyFiles, environment, batchSize, serializer, conf, gateway, jsc, profiler_cls)
139 if gateway is not None and gateway.gateway_parameters.auth_token is None:
140 raise ValueError(
141 "You are trying to pass an insecure Py4j gateway to Spark. This"
142 " is not allowed as it is a security risk.")
--> 144 SparkContext._ensure_initialized(self, gateway=gateway, conf=conf)
145 try:
146 self._do_init(master, appName, sparkHome, pyFiles, environment, batchSize, serializer,
147 conf, jsc, profiler_cls)
File C:\spark-3.2.1-bin-hadoop3.2\python\pyspark\context.py:339, in SparkContext._ensure_initialized(cls, instance, gateway, conf)
337 with SparkContext._lock:
338 if not SparkContext._gateway:
--> 339 SparkContext._gateway = gateway or launch_gateway(conf)
340 SparkContext._jvm = SparkContext._gateway.jvm
342 if instance:
File C:\spark-3.2.1-bin-hadoop3.2\python\pyspark\java_gateway.py:108, in launch_gateway(conf, popen_kwargs)
105 time.sleep(0.1)
107 if not os.path.isfile(conn_info_file):
--> 108 raise RuntimeError("Java gateway process exited before sending its port number")
110 with open(conn_info_file, "rb") as info:
111 gateway_port = read_int(info)
RuntimeError: Java gateway process exited before sending its port number
希望这两个错误有关联
感谢您花时间阅读本文，希望问题能得到解决
一个常见问题是 Java 版本错误。
检查是否已安装 Java 8（或更高版本）并且是否已设置 JAVA_HOME 环境变量（到安装目录）。
如果这没有帮助，您可能还需要设置变量 SPARK_HOME 和 PYTHONPATH （请参阅 https://spark.apache.org/docs/latest/api/python/getting_started/install.html）。
我也遇到同样的错误 但通过以下 2 个步骤即可解决。
安装openjdk
编写以下代码
import pyspark
from pyspark.sql import SparkSession
#Create SparkSession
spark = SparkSession.builder
.master("local[1]")
.appName("myapp.com")
.getOrCreate()