tRiakOutput properties - 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

Component family

Big Data / Riak

 

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.

Since version 5.6, both the Built-In mode and the Repository mode are available in any of the Talend solutions.

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.

 

 

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.

When the schema to be reused has default values that are integers or functions, ensure that these default values are not enclosed within quotation marks. If they are, you must remove the quotation marks manually.

For more details, see the article Verifying default values in a retrieved schema on Talend Help Center (https://help.talend.com).

 

Use existing connection

Select this check box and in the Component List click the relevant connection component to reuse the connection details you already defined.

Warning

If you select the Use an existing connection check box, the Nodes table will not be available.

 

Nodes

Fill in the information required for a connection to a Riak cluster.

  • Host: enter the IP address or hostname of a Riak node in the Riak cluster that you want to connect to.

  • Port: enter the listening port number of a Riak node. You can leave this field empty to use its default value 8098.

  • Riak path: enter the Riak path for accessing a Riak node. You can leave this field empty to use its defalt value riak.

One example of the URL for accessing a Riak node is http://127.0.0.1:8098/riak.

For more information about the concepts related to Riak, see http://docs.basho.com/riak/latest/theory/concepts/.

 

Bucket

Specify the name of the bucket to which you want to apply changes.

 

Action on data

In the specified bucket, you can perform:

  • Upsert: Insert data if they do not exist or update the existing data.

  • Delete: Remove values associated with the specified key.

Warning

If you select Delete from the Action on data list, only the Key column list is available in the Key area.

 

Auto generate the key

Select this check box to let the Riak system generate keys for the values automatically.

 

Key column

Select one column from the list to write its data into the Riak bucket as keys. Note that the key must be unique across one bucket.

 

Value columns

Customize the columns to write their data into the Riak bucket as values.

Advanced settings

tStatCatcher Statistics

Select this check box to gather the Job processing metadata at the Job level as well as at each component level.

Global Variables

UPSERT_NB_LINE: the number of rows inserted and updated. This is an After variable and it returns an integer.

DELETE_NB_LINE: the number of rows deleted. 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 component is used as an output component and it always needs an incoming link.

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