Typical Scenario: Importing Data from an FTP Server to HBase

Scenario

Use Loader to import data from an FTP server to HBase.

Prerequisites

You have obtained the service username and password for creating a Loader job.
You have obtained the username and password of the FTP server and the user has the read permission of the source files on the FTP server. If file name extension needs to be added after a source file is imported, the user must have the write permission of the source file.
No disk space alarm is reported, and the available disk space is sufficient for importing and exporting data.
When using Loader to import data from the FTP server, the input paths and input path subdirectories of the FTP server and the name of the files in these directories do not contain any of the special characters /"':;.
If a configured task requires the Yarn queue function, the user must be authorized with related Yarn queue permission.
The user who configures a task must obtain execution permission on the task and obtain usage permission on the related connection of the task.

Procedure

Setting Basic Job Information

Access the Loader web UI.
1. Log in to FusionInsight Manager. For details, see Accessing FusionInsight Manager.
2. Choose Cluster > Name of the desired cluster > Services > Loader.
3. Click LoaderServer(Node name, Active). The Loader web UI is displayed.
  Figure 1 Loader web UI
Click New Job to go to the Basic Information page and set basic job information.

Figure 2 Basic Information
1. Set Name to the name of the job.
2. Set Type to Import.
3. Set Group to the group to which the job belongs. No group is created by default. You need to click Add to create a group and click OK to save the created group.
4. Set Queue to the Yarn queue that executes the job. The default value is root.default.
5. Set Priority to the priority of the Yarn queue that executes the job. The default value is NORMAL. The options are VERY_LOW, LOW, NORMAL, HIGH, and VERY_HIGH.

In the Connection area, click Add to create a connection, set Connector to ftp-connector, click Add, set connection parameters, and click Test to verify whether the connection is available. When "Test Success" is displayed, click OK. Loader allows multiple FTP servers to be configured. Click Add to add the configuration information of multiple FTP servers.

**Table 1** Connection parameters
Parameter	Description	Example Value
FTP Server IP Address	IP address of the FTP server	ftpName
FTP Server Port	Port number of the FTP server	22
FTP Username	Username for accessing the FTP server	root
FTP Password	Password for accessing the FTP server	xxxx
FTP Mode	FTP access mode. Possible values are ACTIVE and PASSIVE. If this parameter is not set, FTP access is in passive mode by default.	PASSIVE
FTP Protocol	FTP protocol. FTP: indicates the FTP protocol. SSL_EXPLICIT: indicates the explicit SSL protocol. SSL_IMPLICIT: indicates the implicit SSL protocol. TLS_EXPLICIT: indicates the explicit TLS protocol. TLS_IMPLICIT: indicates the implicit TLS protocol. If this parameter is not set, the FTP protocol is used by default.	FTP
File Name Encoding Type	File name and file path encoding format supported by the FTP server. If this parameter is not set, the default format UTF-8 is used.	UTF-8

When multiple FTP servers are configured, the data in the specified directories of the servers is imported to HBase.

Setting Data Source Information

Click Next. On the displayed From page, set the data source information.

**Table 2** Parameter description
Parameter	Description	Example Value
Input Path	Input path or name of the source file on an FTP server. If multiple FTP server IP addresses are configured for the connector, you can set this parameter to multiple input paths separated with semicolons (;). Ensure that the number of input paths is the same as that of FTP servers configured for the connector. NOTE: You can use macros to define path parameters. For details, see Using Macro Definitions in Configuration Items.	/opt/tempfile;/opt
File Split Type	Indicates whether to split source files by file name or size. The files obtained after the splitting are used as the input files of each Map in the MapReduce task for data import. FILE: indicates that the source file is split by file. That is, each Map processes one or multiple complete files, the same source file cannot be allocated to different Maps, and the source file directory structure is retained after data import. SIZE: indicates that the source file is split by size. That is, each Map processes input files of a certain size, and a source file can be divided and processed by multiple Maps. After data is stored in the output directory, the number of saved files is the same as that of Maps. The file name format is import_part_xxxx, where xxxx is a unique random number generated by the system.	FILE
Filter Type	File filter condition. This parameter is used when Path Filter or File Filter is set. WILDCARD: indicates using a wildcard. REGEX: indicates using a regular expression. If the parameter is not set, a wildcard is used by default.	WILDCARD
Path Filter	Wildcard or regular expression for filtering the directories in the input path of the source files. This parameter is used when Filter Type is set. Input Path is not used for filtering. Use semicolons (;) to separate the path filters on multiple servers and use commas (,) to separate the filter conditions of each server. If this parameter is left empty, directories are not filtered. ? matches a single character. * indicates multiple characters. Adding ^ before the condition indicates negated filtering, that is, file filtering. For example, when Filter type is set to WILDCARD, set the parameter to ; when Filter type* is set to REGEX, set the parameter to \\.*.	1,2;1*
File Filter	Wildcard or regular expression for filtering the file names of the source files. This parameter is used when Filter Type is set. Use semicolons (;) to separate the path filters on multiple servers and use commas (,) to separate the filter conditions of each server. This parameter cannot be left blank. ? matches a single character. * indicates multiple characters. Adding ^ before the condition indicates negated filtering, that is, file filtering. For example, when Filter type is set to WILDCARD, set the parameter to ; when Filter type* is set to REGEX, set the parameter to \\.*.	.txt,.csv;*.txt
Encoding Type	Source file encoding format, for example, UTF-8 and GBK. This parameter can be set only in text file import.	UTF-8
Suffix	File name extension added to a source file after the source file is imported. If this parameter is empty, no file name extension is added to the source file. This parameter is valid only when the data source is a file system. You are advised to set this parameter in incremental data import. For example, if the parameter is set to .txt and the source file is test-loader.csv, the source file name is test-loader.csv.txt after export.	.log
Compression	Indicates whether to enable compressed transmission when FTP is used to export data. The value true indicates that compression is enabled. The value false indicates that compression is disabled.	true

Setting Data Transformation

Click Next. On the displayed Transform page, set the transformation operations in the data transformation process. For details about how to select operators and set parameters, see Operator Help and Table 3.

**Table 3** Input and output parameters of the operator
Input Type	Output Type
CSV File Input	HBase Output
HTML Input	HBase Output
Fixed File Input	HBase Output

Figure 3 Operator operation procedure
Click to enlarge

Setting Data Storage Information and Executing the Job

Click Next. On the displayed To page, set Storage type to HBASE_BULKLOAD or HBASE_PUTLIST based on the actual situation.

**Table 4** Parameter description
Storage Type	Applicable Scenario	Parameter	Description	Example Value
HBASE_BULKLOAD	Large data volume	HBase Instance	HBase service instance that Loader selects from all available HBase service instances in the cluster. If the selected HBase service instance is not added to the cluster, the HBase job cannot be run properly.	HBase
		Clear data before import	Indicates whether to clear data in the original table before importing data. True indicates clearing data and False indicates not to clear data. If you do not set this parameter, the original table is not cleared by default.	true
		Extractors	Number of Maps that are started at the same time in a MapReduce task of a data configuration operation. The value must be less than or equal to 3000. You are advised to set the parameter to the maximum number of connections on the FTP server.	20
		Extractor Size	HBase does not support this parameter. Please set Extractors.	-
HBASE_PUTLIST	Small data volume	HBase Instance	HBase service instance that Loader selects from all available HBase service instances in the cluster. If the selected HBase service instance is not added to the cluster, the HBase job cannot be run properly.	HBase
		Extractors	Number of Maps that are started at the same time in a MapReduce task of a data configuration operation. The value must be less than or equal to 3000.	20
		Extractor Size	HBase does not support this parameter. Please set Extractors.	-

Click Save and run to save and run the job.
Checking the Job Execution Result
Go to the Loader web UI. When Status is Succeeded, the job is complete.

Figure 4 Viewing job details