无法通过 SparkR 将 sql 表加载到 r

Question

我正在尝试通过 sparkR 在 R 中加载一个 SQL 表。我有以下代码：

Sys.setenv(SPARK_HOME = "C:/Users/hms/Desktop/spark-2.0.1-bin-hadoop2.7/spark-2.0.1-bin-hadoop2.7",
           HADOOP_HOME = "C:/Users/hms/Desktop/spark-2.0.1-bin-hadoop2.7/spark-2.0.1-bin-hadoop2.7/tmp/hadoop")
.libPaths(c(file.path(Sys.getenv("SPARK_HOME"), "R", "lib"), .libPaths()))

library(SparkR)

sc<-sparkR.session( enableHiveSupport = FALSE, master="local[*]",
                    sparkHome=Sys.getenv("SPARK_HOME"),
                    sparkConfig = list(spark.driver.memory="2g",
                                       spark.driver.extraClassPath="C:/Users/hms/Desktop/spark-2.0.1-bin-hadoop2.7/spark-2.0.1-bin-hadoop2.7/jars/sqljdbc4.jar",
                                       spark.executor.extraClassPath="C:/Users/hms/Desktop/spark-2.0.1-bin-hadoop2.7/spark-2.0.1-bin-hadoop2.7/jars/sqljdbc4.jar",
                                       spark.sql.warehouse.dir="C:/Users/hms/Desktop/spark-2.0.1-bin-hadoop2.7/spark-2.0.1-bin-hadoop2.7/tmp/hadoop/bin") )



persons <- read.jdbc("jdbc:sqlserver://xpto//xpto:1433;databaseName=XPTO_XPTO", "table.XPTO", user = "XPTO", password = "XPTO")

当我按原样运行此代码时，我收到以下错误：

Error in invokeJava(isStatic = FALSE, objId$id, methodName, ...) : 
      com.microsoft.sqlserver.jdbc.SQLServerException: The TCP/IP connection to the host srvptsqlsdd02//sddev02_2k12, port 1433 has failed. Error: "null. Verify the connection properties. Make sure that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port. Make sure that TCP connections to the port are not blocked by a firewall.".
        at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:190)
        at com.microsoft.sqlserver.jdbc.SQLServerException.ConvertConnectExceptionToSQLServerException(SQLServerException.java:241)
        at com.microsoft.sqlserver.jdbc.SocketFinder.findSocket(IOBuffer.java:2243)
        at com.microsoft.sqlserver.jdbc.TDSChannel.open(IOBuffer.java:491)
        at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1309)
        at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:991)
        at com.microsoft.sqlserver.jdbc.SQLServerConnection.conn

有人可以提示可能是什么问题吗？

提前谢谢你

Answer 1

我解决了这个问题

persons <- read.jdbc("jdbc:sqlserver://xpto\\xpto:1433...