tCouchbaseOutput Properties - 6.1

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Component family

Big Data / Couchbase



tCouchbaseOutput inserts, updates, upserts or deletes the documents in the Couchbase database which are stored in the form of Key/Value pairs, where the Value can be JSON or binary data.


This component allows you to perform actions on the JSON or binary documents stored in the Couchbase database based on the incoming flat data from a file, a database table etc.

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.

Click Sync columns to retrieve the schema from the previous component connected in the Job.



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


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.


DB Version

List of database versions.


Data Bucket

Name of the data bucket in the Couchbase database.


Username and Password

Authentication credentials for a data bucket, instead of those for a server node.

To enter the password, click the [...] button next to the password field, and then in the pop-up dialog box enter the password between double quotes and click OK to save the settings.



URIs of server nodes in the Couchbase cluster, in the form of "" or "http://localhost:8091/pools".



Schema field whose contents will be used as the ID of a document in the Couchbase database.



Schema field whose contents will be saved in the Couchbase database as binary documents.

Available when Include JSON Document is not selected.


Action on data

The following operations are available:

Insert: insert data.

Update: update data.

Insert or Update: insert or update data.

Delete: delete data.

Include JSON Document

Select this check box for JSON configuration:

Configure JSON Tree: click the [...] button to open the interface for JSON tree configuration. For more information, see Configuring a JSON Tree.

Group by: click the [+] button to add lines and choose the input columns for grouping the records.


Die on error

This check box is cleared by default, meaning to skip the row on error and to complete the process for error-free rows.

Advanced settings


Expiration value for a document. Defaulted to 0, it means the document will be stored indefinitely.

The expiration time can either be a relative time (for example 60 seconds), or absolute time (31st December 2020, 12:00pm).


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.

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

NB_LINE_REJECTED: the number of rows rejected. 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.


Preceded by an input component, tCouchbaseOutput wraps flat data into JSON documents for storage in the Couchbase database.


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