Sftp file source connector

Support Those Engines

Spark
Flink
SeaTunnel Zeta

Key Features

• batch
• stream
• exactly-once
• column projection
• parallelism
• support user-defined split
• file format type
  • text
  • csv
  • json
  • excel
  • xml

Description

Read data from sftp file server.

Supported DataSource Info

In order to use the SftpFile connector, the following dependencies are required. They can be downloaded via install-plugin.sh or from the Maven central repository.

If you use spark/flink, In order to use this connector, You must ensure your spark/flink cluster already integrated hadoop. The tested hadoop version is 2.x.

If you use SeaTunnel Engine, It automatically integrated the hadoop jar when you download and install SeaTunnel Engine. You can check the jar package under ${SEATUNNEL_HOME}/lib to confirm this.

We made some trade-offs in order to support more file types, so we used the HDFS protocol for internal access to Sftp and this connector need some hadoop dependencies. It only supports hadoop version 2.9.X+.

Data Type Mapping

The File does not have a specific type list, and we can indicate which SeaTunnel data type the corresponding data needs to be converted to by specifying the Schema in the config.

Source Options

file_format_type [string]

File type, supported as the following file types: text csv parquet orc json excel xml If you assign file type to json, you should also assign schema option to tell connector how to parse data to the row you want. For example: upstream data is the following:

{"code":  200, "data":  "get success", "success":  true}

You can also save multiple pieces of data in one file and split them by newline:

{"code":  200, "data":  "get success", "success":  true}
{"code":  300, "data":  "get failed", "success":  false}

you should assign schema as the following:

schema {
    fields {
        code = int
        data = string
        success = boolean
    }
}

connector will generate data as the following:

If you assign file type to parquet orc, schema option not required, connector can find the schema of upstream data automatically. If you assign file type to text csv, you can choose to specify the schema information or not. For example, upstream data is the following:

tyrantlucifer#26#male

If you do not assign data schema connector will treat the upstream data as the following:

If you assign data schema, you should also assign the option field_delimiter too except CSV file type you should assign schema and delimiter as the following:

field_delimiter = "#"
schema {
    fields {
        name = string
        age = int
        gender = string 
    }
}

connector will generate data as the following:

compress_codec [string]

The compress codec of files and the details that supported as the following shown:

• txt: lzo none
• json: lzo none
• csv: lzo none
• orc/parquet:
  automatically recognizes the compression type, no additional settings required.

encoding [string]

Only used when file_format_type is json,text,csv,xml. The encoding of the file to read. This param will be parsed by Charset.forName(encoding).

schema [config]

fields [Config]

The schema of upstream data.

How to Create a Sftp Data Synchronization Jobs

The following example demonstrates how to create a data synchronization job that reads data from sftp and prints it on the local client:

# Set the basic configuration of the task to be performed
env {
  parallelism = 1
  job.mode = "BATCH"
}
# Create a source to connect to sftp
source {
  SftpFile {
    host = "sftp"
    port = 22
    user = seatunnel
    password = pass
    path = "tmp/seatunnel/read/json"
    file_format_type = "json"
    result_table_name = "sftp"
    schema = {
      fields {
        c_map = "map<string, string>"
        c_array = "array<int>"
        c_string = string
        c_boolean = boolean
        c_tinyint = tinyint
        c_smallint = smallint
        c_int = int
        c_bigint = bigint
        c_float = float
        c_double = double
        c_bytes = bytes
        c_date = date
        c_decimal = "decimal(38, 18)"
        c_timestamp = timestamp
        c_row = {
          C_MAP = "map<string, string>"
          C_ARRAY = "array<int>"
          C_STRING = string
          C_BOOLEAN = boolean
          C_TINYINT = tinyint
          C_SMALLINT = smallint
          C_INT = int
          C_BIGINT = bigint
          C_FLOAT = float
          C_DOUBLE = double
          C_BYTES = bytes
          C_DATE = date
          C_DECIMAL = "decimal(38, 18)"
          C_TIMESTAMP = timestamp
        }
      }
    }
  }
}
# Console printing of the read sftp data
sink {
  Console {
    parallelism = 1
  }
}