HdfsFile
HDFS file sink connector
Description
Output data to hdfs file
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 ${SEATUNNEL_HOME}/lib to confirm this.
Key features
By default, we use 2PC commit to ensure exactly-once
- file format type
- text
- csv
- parquet
- orc
- json
- excel
- compress codec
- lzo
Options
| name | type | required | default value | remarks |
|---|---|---|---|---|
| fs.defaultFS | string | yes | - | |
| path | string | yes | - | |
| hdfs_site_path | string | no | - | |
| custom_filename | boolean | no | false | Whether you need custom the filename |
| file_name_expression | string | no | "${transactionId}" | Only used when custom_filename is true |
| filename_time_format | string | no | "yyyy.MM.dd" | Only used when custom_filename is true |
| file_format_type | string | no | "csv" | |
| field_delimiter | string | no | '\001' | Only used when file_format is text |
| row_delimiter | string | no | "\n" | Only used when file_format is text |
| have_partition | boolean | no | false | Whether you need processing partitions. |
| partition_by | array | no | - | Only used then have_partition is true |
| partition_dir_expression | string | no | "${k0}=${v0}/${k1}=${v1}/.../${kn}=${vn}/" | Only used then have_partition is true |
| is_partition_field_write_in_file | boolean | no | false | Only used then have_partition is true |
| sink_columns | array | no | When this parameter is empty, all fields are sink columns | |
| is_enable_transaction | boolean | no | true | |
| batch_size | int | no | 1000000 | |
| compress_codec | string | no | none | |
| kerberos_principal | string | no | - | |
| kerberos_keytab_path | string | no | - | |
| compress_codec | string | no | none | |
| common-options | object | no | - | |
| max_rows_in_memory | int | no | - | Only used when file_format is excel. |
| sheet_name | string | no | Sheet${Random number} | Only used when file_format is excel. |
fs.defaultFS [string]
The hadoop cluster address that start with hdfs://, for example: hdfs://hadoopcluster
path [string]
The target dir path is required.
hdfs_site_path [string]
The path of hdfs-site.xml, used to load ha configuration of namenodes
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:
| Symbol | Description |
|---|---|
| y | Year |
| M | Month |
| d | Day of month |
| H | Hour in day (0-23) |
| m | Minute in hour |
| s | Second in minute |
file_format_type [string]
We supported as the following file types:
text json csv orc parquet excel
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 write to file, default value is all of 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 ${transactionId}_ in the head of the file.
Only support true now.
batch_size [int]
The maximum number of rows in a file. For SeaTunnel Engine, the number of lines in the file is determined by batch_size and checkpoint.interval jointly decide. If the value of checkpoint.interval is large enough, sink writer will write rows in a file until the rows in the file larger than batch_size. If checkpoint.interval is small, the sink writer will create a new file when a new checkpoint trigger.
compress_codec [string]
The compress codec of files and the details that supported as the following shown:
- txt:
lzonone - json:
lzonone - csv:
lzonone - orc:
lzosnappylz4zlibnone - parquet:
lzosnappylz4gzipbrotlizstdnone
Tips: excel type does not support any compression format
kerberos_principal [string]
The principal of kerberos
kerberos_keytab_path [string]
The keytab path of kerberos
common options
Sink plugin common parameters, please refer to Sink Common Options for details
max_rows_in_memory [int]
When File Format is Excel,The maximum number of data items that can be cached in the memory.
sheet_name [string]
Writer the sheet of the workbook
Example
For orc file format simple config
HdfsFile {
fs.defaultFS = "hdfs://hadoopcluster"
path = "/tmp/hive/warehouse/test2"
file_format = "orc"
}
For text file format with have_partition and custom_filename and sink_columns
HdfsFile {
fs.defaultFS = "hdfs://hadoopcluster"
path = "/tmp/hive/warehouse/test2"
file_format_type = "text"
field_delimiter = "\t"
row_delimiter = "\n"
have_partition = true
partition_by = ["age"]
partition_dir_expression = "${k0}=${v0}"
is_partition_field_write_in_file = true
custom_filename = true
file_name_expression = "${transactionId}_${now}"
filename_time_format = "yyyy.MM.dd"
sink_columns = ["name","age"]
is_enable_transaction = true
}
For parquet file format with have_partition and custom_filename and sink_columns
HdfsFile {
fs.defaultFS = "hdfs://hadoopcluster"
path = "/tmp/hive/warehouse/test2"
have_partition = true
partition_by = ["age"]
partition_dir_expression = "${k0}=${v0}"
is_partition_field_write_in_file = true
custom_filename = true
file_name_expression = "${transactionId}_${now}"
filename_time_format = "yyyy.MM.dd"
file_format_type = "parquet"
sink_columns = ["name","age"]
is_enable_transaction = true
}
Changelog
2.2.0-beta 2022-09-26
- Add HDFS 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)
2.3.0 2022-12-30
- [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