OssFile

Oss file source connector

Key features​

• batch

• stream

• exactly-once

Read all the data in a split in a pollNext call. What splits are read will be saved in snapshot.

• column projection

• parallelism

• support user-defined split

• file format type

  • text

  • csv

  • parquet

  • orc

  • json

  • excel

  • xml

  • binary

Data Type Mapping​

Data type mapping is related to the type of file being read, We supported as the following file types:

text csv parquet orc json excel xml

JSON File Type​

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:

code	data	success
200	get success	true

Text Or CSV File Type​

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:

content
tyrantlucifer#26#male

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:

name	age	gender
tyrantlucifer	26	male

Orc File Type​

If you assign file type to parquet orc, schema option not required, connector can find the schema of upstream data automatically.

Orc Data type	Nexus Data type
BOOLEAN	BOOLEAN
INT	INT
BYTE	BYTE
SHORT	SHORT
LONG	LONG
FLOAT	FLOAT
DOUBLE	DOUBLE
BINARY	BINARY
STRING VARCHAR CHAR	STRING
DATE	LOCAL_DATE_TYPE
TIMESTAMP	LOCAL_DATE_TIME_TYPE
DECIMAL	DECIMAL
LIST(STRING)	STRING_ARRAY_TYPE
LIST(BOOLEAN)	BOOLEAN_ARRAY_TYPE
LIST(TINYINT)	BYTE_ARRAY_TYPE
LIST(SMALLINT)	SHORT_ARRAY_TYPE
LIST(INT)	INT_ARRAY_TYPE
LIST(BIGINT)	LONG_ARRAY_TYPE
LIST(FLOAT)	FLOAT_ARRAY_TYPE
LIST(DOUBLE)	DOUBLE_ARRAY_TYPE
Map<K,V>	MapType, This type of K and V will transform to Nexus type
STRUCT	NexusRowType

Parquet File Type​

If you assign file type to parquet orc, schema option not required, connector can find the schema of upstream data automatically.

Orc Data type	Nexus Data type
INT_8	BYTE
INT_16	SHORT
DATE	DATE
TIMESTAMP_MILLIS	TIMESTAMP
INT64	LONG
INT96	TIMESTAMP
BINARY	BYTES
FLOAT	FLOAT
DOUBLE	DOUBLE
BOOLEAN	BOOLEAN
FIXED_LEN_BYTE_ARRAY	TIMESTAMP DECIMAL
DECIMAL	DECIMAL
LIST(STRING)	STRING_ARRAY_TYPE
LIST(BOOLEAN)	BOOLEAN_ARRAY_TYPE
LIST(TINYINT)	BYTE_ARRAY_TYPE
LIST(SMALLINT)	SHORT_ARRAY_TYPE
LIST(INT)	INT_ARRAY_TYPE
LIST(BIGINT)	LONG_ARRAY_TYPE
LIST(FLOAT)	FLOAT_ARRAY_TYPE
LIST(DOUBLE)	DOUBLE_ARRAY_TYPE
Map<K,V>	MapType, This type of K and V will transform to Nexus type
STRUCT	NexusRowType

Options​

name	type	required	default value	Description
path	string	yes	-	The Oss path that needs to be read can have sub paths, but the sub paths need to meet certain format requirements. Specific requirements can be referred to "parse_partition_from_path" option
file_format_type	string	yes	-	File type, supported as the following file types: text csv parquet orc json excel xml binary
bucket	string	yes	-	The bucket address of oss file system, for example: oss://nexus-test.
endpoint	string	yes	-	fs oss endpoint
read_columns	list	no	-	The read column list of the data source, user can use it to implement field projection. The file type supported column projection as the following shown: text csv parquet orc json excel xml . If the user wants to use this feature when reading text json csv files, the "schema" option must be configured.
access_key	string	no	-
access_secret	string	no	-
delimiter	string	no	\001	Field delimiter, used to tell connector how to slice and dice fields when reading text files. Default \001, the same as hive's default delimiter.
parse_partition_from_path	boolean	no	true	Control whether parse the partition keys and values from file path. For example if you read a file from path oss://hadoop-cluster/tmp/nexus/parquet/name=tyrantlucifer/age=26. Every record data from file will be added these two fields: name="tyrantlucifer", age=16
date_format	string	no	yyyy-MM-dd	Date type format, used to tell connector how to convert string to date, supported as the following formats:yyyy-MM-dd yyyy.MM.dd yyyy/MM/dd. default yyyy-MM-dd
datetime_format	string	no	yyyy-MM-dd HH:mm:ss	Datetime type format, used to tell connector how to convert string to datetime, supported as the following formats:yyyy-MM-dd HH:mm:ss yyyy.MM.dd HH:mm:ss yyyy/MM/dd HH:mm:ss yyyyMMddHHmmss
time_format	string	no	HH:mm:ss	Time type format, used to tell connector how to convert string to time, supported as the following formats:HH:mm:ss HH:mm:ss.SSS
skip_header_row_number	long	no	0	Skip the first few lines, but only for the txt and csv. For example, set like following:skip_header_row_number = 2. Then Nexus will skip the first 2 lines from source files
schema	config	no	-	The schema of upstream data.
sheet_name	string	no	-	Reader the sheet of the workbook,Only used when file_format is excel.
xml_row_tag	string	no	-	Specifies the tag name of the data rows within the XML file, only used when file_format is xml.
xml_use_attr_format	boolean	no	-	Specifies whether to process data using the tag attribute format, only used when file_format is xml.
compress_codec	string	no	none	Which compress codec the files used.
encoding	string	no	UTF-8
file_filter_pattern	string	no		*.txt means you only need read the files end with .txt
common-options	config	no	-	Source plugin common parameters, please refer to Source Common Options for details.

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).

file_filter_pattern [string]​

Filter pattern, which used for filtering files.

schema [config]​

Only need to be configured when the file_format_type are text, json, excel, xml or csv ( Or other format we can't read the schema from metadata).

fields [Config]​

The schema of upstream data.

How to Create a Oss Data Synchronization Jobs​

The following example demonstrates how to create a data synchronization job that reads data from Oss 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 Oss
source {
  OssFile {
    path = "/nexus/orc"
    bucket = "oss://tyrantlucifer-image-bed"
    access_key = "xxxxxxxxxxxxxxxxx"
    access_secret = "xxxxxxxxxxxxxxxxxxxxxx"
    endpoint = "oss-cn-beijing.aliyuncs.com"
    file_format_type = "orc"
  }
}

# Console printing of the read Oss data
sink {
  Console {
  }
}

# Set the basic configuration of the task to be performed
env {
  parallelism = 1
  job.mode = "BATCH"
}

# Create a source to connect to Oss
source {
  OssFile {
    path = "/nexus/json"
    bucket = "oss://tyrantlucifer-image-bed"
    access_key = "xxxxxxxxxxxxxxxxx"
    access_secret = "xxxxxxxxxxxxxxxxxxxxxx"
    endpoint = "oss-cn-beijing.aliyuncs.com"
    file_format_type = "json"
    schema {
      fields {
        id = int 
        name = string
      }
    }
  }
}

# Console printing of the read Oss data
sink {
  Console {
  }
}

Multiple Table​

No need to config schema file type, eg: orc.

env {
  parallelism = 1
  spark.app.name = "Nexus"
  spark.executor.instances = 2
  spark.executor.cores = 1
  spark.executor.memory = "1g"
  spark.master = local
  job.mode = "BATCH"
}

source {
  OssFile {
    tables_configs = [
      {
          schema = {
              table = "fake01"
          }
          bucket = "oss://whale-ops"
          access_key = "xxxxxxxxxxxxxxxxxxx"
          access_secret = "xxxxxxxxxxxxxxxxxxx"
          endpoint = "https://oss-accelerate.aliyuncs.com"
          path = "/test/nexus/read/orc"
          file_format_type = "orc"
      },
      {
          schema = {
              table = "fake02"
          }
          bucket = "oss://whale-ops"
          access_key = "xxxxxxxxxxxxxxxxxxx"
          access_secret = "xxxxxxxxxxxxxxxxxxx"
          endpoint = "https://oss-accelerate.aliyuncs.com"
          path = "/test/nexus/read/orc"
          file_format_type = "orc"
      }
    ]
    result_table_name = "fake"
  }
}

sink {
  Assert {
    rules {
        table-names = ["fake01", "fake02"]
    }
  }
}

Need config schema file type, eg: json

env {
  execution.parallelism = 1
  spark.app.name = "Nexus"
  spark.executor.instances = 2
  spark.executor.cores = 1
  spark.executor.memory = "1g"
  spark.master = local
  job.mode = "BATCH"
}

source {
  OssFile {
    tables_configs = [
      {
          bucket = "oss://whale-ops"
          access_key = "xxxxxxxxxxxxxxxxxxx"
          access_secret = "xxxxxxxxxxxxxxxxxxx"
          endpoint = "https://oss-accelerate.aliyuncs.com"
          path = "/test/nexus/read/json"
          file_format_type = "json"
          schema = {
            table = "fake01"
            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
              }
            }
          }
      },
      {
          bucket = "oss://whale-ops"
          access_key = "xxxxxxxxxxxxxxxxxxx"
          access_secret = "xxxxxxxxxxxxxxxxxxx"
          endpoint = "https://oss-accelerate.aliyuncs.com"
          path = "/test/nexus/read/json"
          file_format_type = "json"
          schema = {
            table = "fake02"
            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
              }
            }
          }
      }
    ]
    result_table_name = "fake"
  }
}

sink {
  Assert {
    rules {
      table-names = ["fake01", "fake02"]
    }
  }
}