tBigQueryOutputBulk - 6.3

Talend Open Studio for Big Data Components Reference Guide

EnrichVersion
6.3
EnrichProdName
Talend Open Studio for Big Data
task
Data Governance
Data Quality and Preparation
Design and Development
EnrichPlatform
Talend Studio

The tBigQueryOutputBulk and tBigQueryBulkExec components are generally used together as parts of a two step process. In the first step, an output file is generated. In the second step, this file is used to feed a dataset. These two steps are fused together in the tBigQueryOutput component, detailed in a separate section. The advantage of using two separate components is that the data can be transformed before it is loaded in the dataset.

Function

This component writes given data into a .txt or .csv file, ready to be transferred to Google BigQuery.

Purpose

This component creates a .txt or .csv file for the data of large size so that you can process it according to your needs before transferring it to Google BigQuery.

tBigQueryOutputBulk Properties

Component family

Big Data / Google BigQuery

 

Basic settings

Schema and Edit Schema

A schema is a row description. It defines the number of fields (columns) to be processed and passed on to the next component. The schema is either Built-In or stored remotely in the Repository.

Click Edit schema to make changes to the schema. If the current schema is of the Repository type, three options are available:

  • View schema: choose this option to view the schema only.

  • Change to built-in property: choose this option to change the schema to Built-in for local changes.

  • Update repository connection: choose this option to change the schema stored in the repository and decide whether to propagate the changes to all the Jobs upon completion. If you just want to propagate the changes to the current Job, you can select No upon completion and choose this schema metadata again in the [Repository Content] window.

 

Property type

Built-In: You create and store the schema locally for this component only. Related topic: see Talend Studio User Guide.

 

 

Repository: You have already created the schema and stored it in the Repository. You can reuse it in various projects and Job designs. Related topic: see Talend Studio User Guide.

 

File name

Browse, or enter the path to the .txt or .csv file you need to generate.

 

Append

Select the check box to write new data at the end of the existing data. Otherwise, the existing data will be overwritten.

Advanced settings

Field Separator

Enter character, string or regular expression to separate fields for the transferred data.

  Create directory if not exists

Select this check box to create the directory you defined in the File field for Google Cloud Storage, if it does not exist.

Custom the flush buffer size

Enter the number of rows to be processed before the memory is freed.

 

Check disk space

Select the this check box to throw an exception during execution if the disk is full.

 

Encoding

Select the encoding from the list or select Custom and define it manually. This field is compulsory for database data handling.

 

tStatCatcher Statistics

Select this check box to collect the log data at the component level/

Global Variables

NB_LINE: the number of rows read by an input component or transferred to an output component. This is an After variable and it returns an integer.

ERROR_MESSAGE: the error message generated by the component when an error occurs. This is an After variable and it returns a string. This variable functions only if the Die on error check box is cleared, if the component has this check box.

A Flow variable functions during the execution of a component while an After variable functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl + Space to access the variable list and choose the variable to use from it.

For further information about variables, see Talend Studio User Guide.

Usage

This is an output component which needs the data provided by its preceding component.

Log4j

If you are using a subscription-based version of the Studio, the activity of this component can be logged using the log4j feature. For more information on this feature, see Talend Studio User Guide.

For more information on the log4j logging levels, see the Apache documentation at http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Level.html.

Limitation

N/A

Related Scenario

For related topic, see Scenario: Writing data in BigQuery