sql - 从PolyBase连接到Hadoop

Question

如果在以下代码中遇到以下异常，这意味着什么？
我没有找到有用的定义。

异常(exception)是

External Data Source information could not be retrieved due to an internal error Exception of type 'JNI.JavaExceptionCheckException' was thrown.: Error [Call From MIS-PC12/192.168.4.132 to 192.168.4.116:8020 failed on connection exception: java.net.ConnectException: Connection refused: no further information; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused] occurred while accessing external file.

代码是

CREATE EXTERNAL DATA SOURCE MyHadoopCluster2 WITH (
    TYPE = HADOOP,
    LOCATION ='hdfs://192.168.4.116:8020',
    RESOURCE_MANAGER_LOCATION = '192.168.4.116:8020'
);
GO
CREATE EXTERNAL FILE FORMAT TextFileFormat2 WITH (
    FORMAT_TYPE = DELIMITEDTEXT,
    FORMAT_OPTIONS (FIELD_TERMINATOR ='|'));

CREATE EXTERNAL TABLE [dbo].[CarSensor_Data] (
    [SensorKey] int NOT NULL,
    [CustomerKey] int NOT NULL,
    [GeographyKey] int NULL,
    [Speed] float NOT NULL,
    [YearMeasured] int NOT NULL
)
WITH (LOCATION='/D:\/',
DATA_SOURCE = MyHadoopCluster2,
FILE_FORMAT = TextFileFormat2

);

我不知道hadoop数据库的位置，这是原因吗？

Answer 1

LOCATION参数需要指向您的Hadoop集群的名称节点。