DB2 与本地 Pyspark 的连接

Question

我正在尝试通过 pyspark 连接到 db2，下面是我的连接字符串。

from pyspark import SparkConf, SparkContext, SQLContext

conf = SparkConf().setAppName("test").setMaster("local").set("spark.jars","\IBM\IBM_DATA_SERVER_DRIVER\java\db2jcc4.jar")
sc = SparkContext(conf=conf)
sqlContext = SQLContext(sc)



df = (sqlContext.read.format('jdbc')\
      .option('url', 'jdbc:db2://********.COM:*****/*****')\
      .option('driver', 'com.ibm.db2.jcc.DB2Driver')\
      .option('dbtable', "(SELECT * FROM table.table limit 100) as t")\
      .option('user', 'user')\
      .option('password', 'password')).load()

但是，我收到如下错误

Py4JJavaError: An error occurred while calling o161.load.
: java.lang.ClassNotFoundException: com.ibm.db2.jcc.DB2Driver
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
    at org.apache.spark.sql.execution.datasources.jdbc.DriverRegistry$.register(DriverRegistry.scala:45)
    at org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions$$anonfun.apply(JDBCOptions.scala:99)
    at org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions$$anonfun.apply(JDBCOptions.scala:99)
    at scala.Option.foreach(Option.scala:257)
    at org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions.<init>(JDBCOptions.scala:99)
    at org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions.<init>(JDBCOptions.scala:35)
    at org.apache.spark.sql.execution.datasources.jdbc.JdbcRelationProvider.createRelation(JdbcRelationProvider.scala:32)
    at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:332)
    at org.apache.spark.sql.DataFrameReader.loadV1Source(DataFrameReader.scala:242)
    at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:230)
    at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:186)
    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)

我已经下载了最新的驱动程序并指定了它。你能帮我解决这个问题以通过 pyspark 连接到 db2。

Answer 1

尝试不指定驱动程序。将 db2 的 jar 文件放在 $SPARK_HOME/jars 中应该就足够了。

还可以使用 SparkSession 读取输入文件。 SQLContext 已弃用。

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