Pyspark：异常：Java 网关进程在向驱动程序发送其端口号之前退出

Question

我正在尝试在我的 macbook air 上运行 pyspark。当我尝试启动它时出现错误：

 Exception: Java gateway process exited before sending the driver its port number

当启动时调用 sc = SparkContext() 时。我尝试运行以下命令：

 ./bin/pyspark
./bin/spark-shell
export PYSPARK_SUBMIT_ARGS="--master local[2] pyspark-shell"

没有用。我也看过这里：

Spark + Python - Java 网关进程在向驱动程序发送其端口号之前退出？

但这个问题从未得到回答。请帮忙！谢谢。

原文由 mt88 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

一种可能的原因是未设置 JAVA_HOME，因为未安装 java。

我遇到了同样的问题。它说

Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/spark/launcher/Main : Unsupported major.minor version 51.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:643)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:296)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:406)
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/opt/spark/python/pyspark/conf.py", line 104, in __init__
    SparkContext._ensure_initialized()
  File "/opt/spark/python/pyspark/context.py", line 243, in _ensure_initialized
    SparkContext._gateway = gateway or launch_gateway()
  File "/opt/spark/python/pyspark/java_gateway.py", line 94, in launch_gateway
    raise Exception("Java gateway process exited before sending the driver its port number")
Exception: Java gateway process exited before sending the driver its port number

在 sc = pyspark.SparkConf() 。我通过运行解决了它

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

来自 https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-get-on-ubuntu-16-04

原文由 Old Panda 发布，翻译遵循 CC BY-SA 3.0 许可协议