Load configuration file for a GPSS file data source.

Synopsis

DATABASE: <db_name>
USER: <user_name>
PASSWORD: <password>
HOST: <master_host>
PORT: <greenplum_port>
VERSION: 2
FILE:
    INPUT:
       SOURCE:
         URL: <file_path>
       VALUE:
         [COLUMNS:
            - NAME: <column_name>
              TYPE: <column_data_type>
            [ ... ]]
         FORMAT: <value_data_format>
         [AVRO_OPTION:
            BYTES_TO_BASE64: <boolean>]
         [CSV_OPTION:
            [DELIMITER: <delim_char>]
            [QUOTE: <quote_char>]
            [NULL_STRING: <nullstr_val>]
            [ESCAPE: <escape_char>]
            [FORCE_NOT_NULL: <columns>]
            [FILL_MISSING_FIELDS: <boolean>]]
            [NEWLINE: <newline_str>]]
         [JSONL_OPTION:
            [NEWLINE: <newline_str>]]
       [META:
         COLUMNS:
            - NAME: <meta_column_name>
              TYPE: { json | jsonb }
         FORMAT: json
       [FILTER: <filter_string>]
       [ERROR_LIMIT: { <num_errors> | <percentage_errors> }]
    OUTPUT:
       [SCHEMA: <output_schema_name>]
       TABLE: <table_name>
       [MODE: <mode>]
       [MATCH_COLUMNS:
          - <match_column_name>
          [ ... ]]
       [ORDER_COLUMNS:
          - <order_column_name>
          [ ... ]]
       [UPDATE_COLUMNS:
          - <update_column_name>
          [ ... ]]
       [UPDATE_CONDITION: <update_condition>]
       [DELETE_CONDITION: <delete_condition>]
    TASK:
       PREPARE_SQL: <udf_or_sql_command_to_run>
       TEARDOWN_SQL: <udf_or_sql_command_to_run>
[SCHEDULE:
   RETRY_INTERVAL: <retry_time>
   MAX_RETRIES: <num_retries>]

Where you may specify any property value with a template variable that GPSS substitutes at runtime using the following syntax:

<PROPERTY:> {{<template_var>}}

Description

You specify the configuration parameters for a Greenplum Streaming Server (GPSS) file load job in a YAML-formatted configuration file that you provide to the gpsscli submit or gpsscli load commands. There are two types of configuration parameters in this file - those that identify the Greenplum Database connection and target table, and parameters specific to the file data source that you will load into Greenplum.

This reference page uses the name filesource.yaml to refer to this file; you may choose your own name for the file.

The gpsscli utility processes the YAML configuration file keywords in order, using indentation (spaces) to determine the document hierarchy and the relationships between the sections. The use of white space in the file is significant, and keywords are case-sensitive.

Keywords and Values

Greenplum Database Options

DATABASE: db_name
The name of the Greenplum database.
USER: user_name
The name of the Greenplum Database user/role. This user_name must have permissions as described in Configuring Greenplum Database Role Privileges.
PASSWORD: password
The password for the Greenplum Database user/role.
HOST: master_host
The host name or IP address of the Greenplum Database master host.
PORT: greenplum_port
The port number of the Greenplum Database server on the master host.
VERSION: 2
The version of the GPSS load configuration file. GPSS supports version 2 of this format for a file data source.

FILE:INPUT: Options

SOURCE

The file input configuration parameters.

URL: file_path
The URL identifying the file or files to be loaded. You can specify wildcards in any element of the path. To load all files in a directory, specify dirname/*.
VALUE:

The field names, types, and format of the file data. You must specify all data elements in the order in which they appear in the file.

COLUMNS:NAME: column_name
The name of a data value column. column_name must match the column name of the target Greenplum Database table.

: The default source-to-target data mapping behaviour of GPSS is to match a column name as defined in COLUMNS:NAME with a column name in the target Greenplum Database TABLE. You can override the default mapping by specifying a MAPPING block.

COLUMNS:TYPE: data_type
The data type of the column. You must specify a compatible data type for each data element and the associated Greenplum Database table column.
FORMAT: data_format
The format of the value data. You may specify a FORMAT of avro, binary, csv, json, or jsonl for the value data, with some restrictions.
avro
When you specify the avro data format, you must define only a single json type column in COLUMNS. If the schema is registered in a Confluent Schema Registry, you must also provide the AVRO_OPTION.
binary
When you specify the binary data format, you must define only a single bytea type column in COLUMNS.
csv
When you specify the csv data format, the message content cannot contain line ending characters (CR and LF). You may also choose to provide CSV_OPTIONs.
When you specify FORMAT: csv, you must not provide a META block.
json
When you specify the json data format, you must define only a single json type column in COLUMNS.
jsonl
When you specify the jsonl data format, you may provide a JSONL_OPTION to define a newline character.
AVRO_OPTION:BYTES_TO_BASE64: boolean
When true, GPSS converts Avro bytes fields into base64-encoded strings. The default value is false, GPSS does not perfrom the conversion.
CSV_OPTION
When you specify FORMAT: csv, you may also provide the following options:
DELIMITER: delim_char
Specifies a single ASCII character that separates columns within each message or row of data. The default delimiter is a comma ( ,).
QUOTE: quote_char
Specifies the quotation character. Because GPSS does not provide a default value for this property, you must specify a value.
NULL_STRING: nullstr_val
Specifies the string that represents the null value. Because GPSS does not provide a default value for this property, you must specify a value.
ESCAPE: escape_char
Specifies the single character that is used for escaping data characters in the content that might otherwise be interpreted as row or column delimiters. Make sure to choose an escape character that is not used anywhere in your actual column data. Because GPSS does not provide a default value for this property, you must specify a value.
FORCE_NOT_NULL: columns
Specifies a comma-separated list of column names to process as though each column were quoted and hence not a NULL value. For the default null_string (nothing between two delimiters), missing values are evaluated as zero-length strings.
FILL_MISSING_FIELDS: boolean
Specifies the action of GPSS when it reads a row of data that has missing trailing field values (the row has missing data fields at the end of a line or row). The default value is false, GPSS returns an error when it encounters a row with missing trailing field values.
If set to true, GPSS sets missing trailing field values to NULL. Blank rows, fields with a NOT NULL constraint, and trailing delimiters on a line will still generate an error.
NEWLINE: newline_str
Specifies the string that represents a new line. GPSS does not specify a default value.
JSONL_OPTION
Optional. When you specify FORMAT: jsonl, you may choose to provide the JSONL_OPTION properties.
NEWLINE: newline_str
A string that specifies the new line character(s) that end each JSON record. The default newline is "\n".
META:
The field name, type, and format of the file meta data. META must specify a single json or jsonb (Greenplum 6 only) type column and FORMAT: json. The available meta data for a file is a single text-type property named filename. You can load this property into the target table with a MAPPING, or use the property in the update or merge criteria for a load operation.
FILTER: filter_string
The filter to apply to the input data before gpkafka loads the data into Greenplum Database. If the filter evaluates to true, GPSS loads the message. If the filter evaluates to false, the message is dropped. filter_string must be a valid SQL conditional expression and may reference one or more META or VALUE column names.
ERROR_LIMIT: { num_errors | percentage_errors }
The error threshold, specified as either an absolute number or a percentage. GPSS stops the load operation when this limit is reached. The default ERROR_LIMIT is zero; GPSS disables error logging and stops the load operation when it encounters the first error. Due to a limitation of the Greenplum Database external table framework, GPSS does not accept ERROR_LIMIT: 1.

FILE:OUTPUT: Options

SCHEMA: output_schema_name
The name of the Greenplum Database schema in which table_name resides. Optional, the default schema is the public schema.
TABLE: table_name
The name of the Greenplum Database table into which GPSS loads the file data.
MODE: mode

The table load mode. Valid mode values are INSERT, MERGE, or UPDATE. The default value is INSERT.

UPDATE - Updates the target table columns that are listed in UPDATE_COLUMNS when the input columns identified in MATCH_COLUMNS match the named target table columns and the optional UPDATE_CONDITION is true.

UPDATE is not supported if the target table column name is a reserved keyword, has capital letters, or includes any character that requires quotes (" ") to identify the column.

MERGE - Inserts new rows and updates existing rows when:

  • columns are listed in UPDATE_COLUMNS,
  • the MATCH_COLUMNS target table column values are equal to the input data, and
  • an optional UPDATE_CONDITION is specified and met.

Deletes rows when:

  • the MATCH_COLUMNS target table column values are equal to the input data, and
  • an optional DELETE_CONDITION is specified and met.

New rows are identified when the MATCH_COLUMNS value in the source data does not have a corresponding value in the existing data of the target table. In those cases, the entire row from the source file is inserted, not only the MATCH_COLUMNS and UPDATE_COLUMNS. If there are multiple new MATCH_COLUMNS values in the input data that are the same, GPSS inserts or updates the target table using a random matching input row. When you specify ORDER_COLUMNS, GPSS sorts the input data on the specified column(s) and inserts or updates from the input row with the largest value.

MERGE is not supported if the target table column name is a reserved keyword, has capital letters, or includes any character that requires quotes (" ") to identify the column.
MATCH_COLUMNS:

Required if MODE is MERGE or UPDATE.

match_column_name
Specifies the column(s) to use as the join condition for the update. The attribute value in the specified target column(s) must be equal to that of the corresponding source data column(s) in order for the row to be updated in the target table.
ORDER_COLUMNS:

Optional. May be specified in MERGE MODE to sort the input data rows.

order_column_name
Specify the column(s) by which GPSS sorts the rows. When multiple matching rows exist in a batch, ORDER_COLUMNS is used with MATCH_COLUMNS to determine the input row with the largest value; GPSS uses that row to write/update the target.
UPDATE_COLUMNS:

Required if MODE is MERGE or UPDATE.

update_column_name
Specifies the column(s) to update for the rows that meet the MATCH_COLUMNS criteria and the optional UPDATE_CONDITION.
UPDATE_CONDITION: update_condition
Optional. Specifies a boolean condition, similar to that which you would declare in a WHERE clause, that must be met in order for a row in the target table to be updated (or inserted, in the case of a MERGE).
DELETE_CONDITION: delete_condition
Optional. In MERGE MODE, specifies a boolean condition, similar to that which you would declare in a WHERE clause, that must be met for GPSS to delete rows in the target table that meet the MATCH_COLUMNS criteria.
MAPPING:

Optional. Overrides the default source-to-target column mapping. GPSS supports two mapping syntaxes.

Note: When you specify a MAPPING, ensure that you provide a mapping for all data value elements of interest. GPSS does not automatically match column names when you provide a MAPPING.

NAME: target_column_name
Specifies the target Greenplum Database table column name.
EXPRESSION: { source_column_name | expression }
Specifies a value or meta COLUMNS:NAME (source_column_name) or an expression. When you specify an expression, you may provide a value expression that you would specify in the SELECT list of a query, such as a constant value, a column reference, an operator invocation, a built-in or user-defined function call, and so on.
target_column_name: { source_column_name | expression }
When you use this MAPPING syntax, specify the target_column_name and {source_column_name | expression} as described above.

FILE:TASK: Options

PREPARE_SQL: udf_or_sql_to_run
The user-defined function or SQL command(s) that you want GPSS to run before it executes the job. The default is null, no command to execute.
TEARDOWN_SQL: udf_or_sql_to_run
The user-defined function or SQL command(s) that you want GPSS to run after the job completes. The default is null, no command to execute.

Job SCHEDULE: Options

SCHEDULE:

Controls the frequency and interval of restarting failed jobs.

RETRY_INTERVAL: retry_time
The period of time that GPSS waits before retrying the job. You can specify the time interval in day ( d), hour ( h), minute ( m), second ( s), or millisecond ( ms) integer units; do not mix units. The default retry interval is 5m (5 minutes).
MAX_RETRIES: num_retries
The maximum number of times that GPSS attempts to retry the job. The default is 0, do not retry. If you specify a negative value, GPSS retries the job indefinitely.

Template Variables

GPSS supports using template variables to specify property values in the load configuration file.

You specify a template variable value in the load configuration file as follows:

<PROPERTY>: {{<template_var>}}

For example:

MAX_RETRIES: {{numretries}}

GPSS substitutes the template variable with a value that you specify via the -p | --property template\_var=value option to the gpsscli submit, gpsscli load, or gpkafka load command.

For example, if the command line specifies:

--property numretries=10

GPSS substitutes occurrences of {{numretries}} in the load configuration file with the value 10 before submitting the job, and uses that value during job execution.

Notes

If you created a database object name using a double-quoted identifier (delimited identifier), you must specify the delimited name within single quotes in the filesource.yaml configuration file. For example, if you create a table as follows:

CREATE TABLE "MyTable" ("MyColumn" text);

Your filesource.yaml YAML configuration file would refer to the above table and column names as:

  COLUMNS:
     - name: '"MyColumn"'
       type: text

OUTPUT:
   TABLE: '"MyTable"'

You can specify backslash escape sequences in the CSV DELIMITER, QUOTE, and ESCAPE options. GPSS supports the standard backslash escape sequences for backspace, form feed, newline, carriage return, and tab, as well as escape sequences that you specify in hexadecimal format (prefaced with \x). Refer to Backslash Escape Sequences in the PostgreSQL documentation for more information.

Examples

Submit a job to load data from an Avro file as defined in the version 2 load configuration file named loadfromfile.yaml:

$ gpsscli submit loadfromfile.yaml

Example loadfromfile.yaml configuration file:

DATABASE: ops
USER: gpadmin
PASSWORD: changeme
HOST: mdw-1
PORT: 15432
VERSION: 2
FILE:
   INPUT:
      SOURCE:
         URL: file:///tmp/file.avro
      VALUE:
         COLUMNS:
           - NAME: value
             TYPE: json
         FORMAT: avro
      META:
         COLUMNS:
           - NAME: meta
             TYPE: json
         FORMAT: json
      FILTER: (value->>'x')::int < 10
      ERROR_LIMIT: 25
   OUTPUT:
      SCHEMA: gpschema
      TABLE: gptable
      MODE: INSERT
      MAPPING:
        - NAME: a
          EXPRESSION: (value->>'x')::int
        - NAME: b
          EXPRESSION: (value->>'y')::text
        - NAME: c
          EXPRESSION: (meta->>'filename')::text
SCHEDULE:
  RETRY_INTERVAL: 500ms
  MAX_RETRIES: 2

See Also

gpsscli load, gpsscli submit

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