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Version: 2.3.1


Ftp file sink connector


Output data to Ftp .


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.

Key features

By default, we use 2PC commit to ensure exactly-once

  • file format
    • text
    • csv
    • parquet
    • orc
    • json


nametyperequireddefault valueremarks
custom_filenamebooleannofalseWhether you need custom the filename
file_name_expressionstringno"${transactionId}"Only used when custom_filename is true
filename_time_formatstringno"yyyy.MM.dd"Only used when custom_filename is true
field_delimiterstringno'\001'Only used when file_format is text
row_delimiterstringno"\n"Only used when file_format is text
have_partitionbooleannofalseWhether you need processing partitions.
partition_byarrayno-Only used then have_partition is true
partition_dir_expressionstringno"${k0}=${v0}/${k1}=${v1}/.../${kn}=${vn}/"Only used then have_partition is true
is_partition_field_write_in_filebooleannofalseOnly used then have_partition is true
sink_columnsarraynoWhen this parameter is empty, all fields are sink columns

host [string]

The target ftp host is required

port [int]

The target ftp port is required

username [string]

The target ftp username is required

password [string]

The target ftp password is required

path [string]

The target dir path is required.

custom_filename [boolean]

Whether custom the filename

file_name_expression [string]

Only used when custom_filename is true

file_name_expression describes the file expression which will be created into the path. We can add the variable ${now} or ${uuid} in the file_name_expression, like test_${uuid}_${now}, ${now} represents the current time, and its format can be defined by specifying the option filename_time_format.

Please note that, If is_enable_transaction is true, we will auto add ${transactionId}_ in the head of the file.

filename_time_format [string]

Only used when custom_filename is true

When the format in the file_name_expression parameter is xxxx-${now} , filename_time_format can specify the time format of the path, and the default value is yyyy.MM.dd . The commonly used time formats are listed as follows:

dDay of month
HHour in day (0-23)
mMinute in hour
sSecond in minute

file_format [string]

We supported as the following file types:

text json csv orc parquet

Please note that, The final file name will end with the file_format's suffix, the suffix of the text file is txt.

field_delimiter [string]

The separator between columns in a row of data. Only needed by text file format.

row_delimiter [string]

The separator between rows in a file. Only needed by text file format.

have_partition [boolean]

Whether you need processing partitions.

partition_by [array]

Only used when have_partition is true.

Partition data based on selected fields.

partition_dir_expression [string]

Only used when have_partition is true.

If the partition_by is specified, we will generate the corresponding partition directory based on the partition information, and the final file will be placed in the partition directory.

Default partition_dir_expression is ${k0}=${v0}/${k1}=${v1}/.../${kn}=${vn}/. k0 is the first partition field and v0 is the value of the first partition field.

is_partition_field_write_in_file [boolean]

Only used when have_partition is true.

If is_partition_field_write_in_file is true, the partition field and the value of it will be write into data file.

For example, if you want to write a Hive Data File, Its value should be false.

sink_columns [array]

Which columns need be wrote to file, default value is all the columns get from Transform or Source. The order of the fields determines the order in which the file is actually written.

is_enable_transaction [boolean]

If is_enable_transaction is true, we will ensure that data will not be lost or duplicated when it is written to the target directory.

Please note that, If is_enable_transaction is true, we will auto add ${transactionId}_ in the head of the file.

Only support true now.

batch_size [int]

The maximum number of rows in a file. For SeaTunnel Engine, the number of lines in the file is determined by batch_size and checkpoint.interval jointly decide. If the value of checkpoint.interval is large enough, sink writer will write rows in a file until the rows in the file larger than batch_size. If checkpoint.interval is small, the sink writer will create a new file when a new checkpoint trigger.

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: lzo snappy lz4 zlib none
  • parquet: lzo snappy lz4 gzip brotli zstd none

common options

Sink plugin common parameters, please refer to Sink Common Options for details.


For text file format simple config

FtpFile {
host = ""
port = 21
username = "username"
password = "password"
path = "/data/ftp"
file_format = "text"
field_delimiter = "\t"
row_delimiter = "\n"
sink_columns = ["name","age"]

For text file format with have_partition and custom_filename and sink_columns

FtpFile {
host = ""
port = 21
username = "username"
password = "password"
path = "/data/ftp"
file_format = "text"
field_delimiter = "\t"
row_delimiter = "\n"
have_partition = true
partition_by = ["age"]
partition_dir_expression = "${k0}=${v0}"
is_partition_field_write_in_file = true
custom_filename = true
file_name_expression = "${transactionId}_${now}"
sink_columns = ["name","age"]
filename_time_format = "yyyy.MM.dd"


2.2.0-beta 2022-09-26

  • Add Ftp File Sink Connector

2.3.0-beta 2022-10-20

  • [BugFix] Fix the bug of incorrect path in windows environment (2980)
  • [BugFix] Fix filesystem get error (3117)
  • [BugFix] Solved the bug of can not parse '\t' as delimiter from config file (3083)

Next version

  • [BugFix] Fixed the following bugs that failed to write data to files (3258)
    • When field from upstream is null it will throw NullPointerException
    • Sink columns mapping failed
    • When restore writer from states getting transaction directly failed
  • [Improve] Support setting batch size for every file (3625)
  • [Improve] Support file compress (3899)