Question

我正在尝试连接到本地托管的mysql数据库。我尝试了两个系统--R和Python。

以下是我的设置.profile

的屏幕截图

和.bash_profile

这是我做的：

试图将pyspark连接到本地mysql，我收到错误见下面（pyspark的跟踪错误）

Py4JJavaError Traceback（最近一次调用最后一次） in（） 5 sparkClassPath = os.getenv（'SPARK_CLASSPATH'，'/ Users / me / mysql-connectctor-java-8.0./mysql-connector-java-8.0.11.jar'） 6 sqlContext = SQLContext（SparkContext.getOrCreate（）） ----＆GT; 7 sqlContext.read.format（“jdbc”）。options（url =“jdbc：mysql：//127.0.0.1：4040”，driver =“com.mysql.jdbc.Driver”，dbtable =“product”，user = “根”，口令= ''）。负载（）

    ~/Documents/spark/spark-2.2.1-bin-hadoop2.7/python/pyspark/sql/readwriter.py in load(self, path, format, schema, **options)
        163             return self._df(self._jreader.load(self._spark._sc._jvm.PythonUtils.toSeq(path)))
        164         else:
    --> 165             return self._df(self._jreader.load())
        166 
        167     @since(1.4)

~/Documents/spark/spark-2.2.1-bin-hadoop2.7/python/lib/py4j-0.10.4-src.zip/py4j/java_gateway.py in __call__(self, *args)
   1131         answer = self.gateway_client.send_command(command)
   1132         return_value = get_return_value(
-> 1133             answer, self.gateway_client, self.target_id, self.name)
   1134 
   1135         for temp_arg in temp_args:

~/Documents/spark/spark-2.2.1-bin-hadoop2.7/python/pyspark/sql/utils.py in deco(*a, **kw)
     61     def deco(*a, **kw):
     62         try:
---> 63             return f(*a, **kw)
     64         except py4j.protocol.Py4JJavaError as e:
     65             s = e.java_exception.toString()

~/Documents/spark/spark-2.2.1-bin-hadoop2.7/python/lib/py4j-0.10.4-src.zip/py4j/protocol.py in get_return_value(answer, gateway_client, target_id, name)
    317                 raise Py4JJavaError(
    318                     "An error occurred while calling {0}{1}{2}.\n".
--> 319                     format(target_id, ".", name), value)
    320             else:
    321                 raise Py4JError(

Py4JJavaError: An error occurred while calling o93.load.
: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at org.apache.spark.sql.execution.datasources.jdbc.DriverRegistry$.register(DriverRegistry.scala:38)
    at org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions$$anonfun$6.apply(JDBCOptions.scala:78)
    at org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions$$anonfun$6.apply(JDBCOptions.scala:78)
    at scala.Option.foreach(Option.scala:257)
    at org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions.<init>(JDBCOptions.scala:78)
    at org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions.<init>(JDBCOptions.scala:34)
    at org.apache.spark.sql.execution.datasources.jdbc.JdbcRelationProvider.createRelation(JdbcRelationProvider.scala:34)
    at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:307)
    at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:178)
    at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:146)
    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:280)
    at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
    at py4j.commands.CallCommand.execute(CallCommand.java:79)
    at py4j.GatewayConnection.run(GatewayConnection.java:214)
    at java.lang.Thread.run(Thread.java:748)

试图连接到sparlyr到本地mysql，我收到错误，见下文（sparklyr的跟踪错误）

sparklyr的跟踪错误

问题：如何从pyspark或sparklyr连接到mysql？

Answer 1

几年前，

SPARK_CLASSPATH已被弃用，不再受支持。假设jar包含有效的驱动程序版本，请使用：

spark.jars配置选项。

或合并：

spark.driver.extraClassPath
spark.executor.extraClassPath

选项。

从sparklyr和/或pyspark连接到mysql

1 个答案: