Loader Link Configuration

This section applies to versions earlier than MRS 3.x.

Overview

Loader supports the following links. This section describes configurations of each link.

obs-connector
generic-jdbc-connector
ftp-connector or sftp-connector
hbase-connector, hdfs-connector, or hive-connector

OBS Link

An OBS link is a data exchange channel between Loader and OBS. Table 1 describes the configuration parameters.

**Table 1** **obs-connector** configuration
Parameter	Description
Name	Name of a Loader connection
OBS Server	Enter an OBS endpoint. The common format is OBS.Region.DomainName. Run the following command to query the endpoints of OBS: cat /opt/Bigdata/apache-tomcat-7.0.78/webapps/web/WEB-INF/classes/cloud-obs.properties
Port	Specifies the port for accessing OBS data. The default value is 443.
Access Key	AK for a user to access OBS
Security Key	SK corresponding to AK

Relational Database Link

A relational database link is a data exchange channel between Loader and a relational database. Table 2 describes the configuration parameters.

Some parameters are hidden by default. They appear only after you click Show Senior Parameter.

**Table 2** **generic-jdbc-connector** configuration
Parameter	Description
Name	Name of a Loader link
Database Type	Data types supported by Loader links: ORACLE, MYSQL, and MPPDB
Host	Database access address, which can be an IP address or domain name.
Port	Port for accessing the database
Database	Name of the database saving data
Username	Username for accessing the database
Password	Password of the user Use the actual password.

**Table 3** Senior parameter configuration
Parameter	Description
Fetch Size	A maximum volume of data obtained during each database access
Connection Properties	Drive properties exclusive to the database link supported by databases of different types, for example, autoReconnect of MYSQL. If you want to define the drive properties, click Add.
Identifier Enclose	Delimiter for reserving keywords in the database SQL. Delimiters defined in different databases vary.

File Server Link

File server links include FTP and SFTP links and serve as a data exchange channel between Loader and a file server. Table 4 describes the configuration parameters.

**Table 4** **ftp-connector** or **sftp-connector** configuration
Parameter	Description
Name	Name of a Loader link
Hostname/IP	Enter the file server access address, which can be a host name or IP address.
Port	Port for accessing the file server. Use port 21 for FTP. Use port 22 for SFTP.
Username	Username for logging in to the file server
Password	Password of the user

MRS Cluster Link

MRS cluster links include HBase, HDFS, and Hive links and serve as a data exchange channel between Loader and HBase, HDFS, or Hive.

When configuring an MRS cluster link, set the name, select a connector, for example, hbase-connector, hdfs-connector, or hive-connector, and save the settings.

Parent topic: Using Loader

Previous topic: Creating a Loader Role

Next topic: Managing Loader Links (Versions Earlier Than MRS 3.x)