July 30, 2023

tCollector – Docs for ESB 7.x


Feeds the parallel execution processes with the threads generated by tPartitioner.

Note that Talend Studio also enables the automatic implementation of parallelization
across a Job without use of the parallelization components and we recommend using that
approach. For further information, see the section describing how to enable
parallelization of data flows of the Talend Studio User Guide. However, if you
need to understand how to use these specific parallelization components, bear in mind
that the parallelization components work closely with each other to accomplish parallel
execution on given processes: the tPartitioner
component dispatches the input records into a specific number of threads; the tCollector component sends these threads to its following
components for parallel execution; the tDepartitioner
component regroups the outputs of the processed parallel threads; the tRecollector component captures the output of a given
tDepartitioner component and sends the captured
data to the next component.

This component receives parallel threads from tPartitioner and sends those threads to
the following components for parallel execution.

tCollector Standard properties

These properties are used to configure tCollector running in the Standard Job framework.

The Standard
tCollector component belongs to the Orchestration family.

This component is available in Talend products with Big Data, Talend Data Management Platform, Talend Data Services Platform, Talend MDM Platform and Talend Data Fabric.

Basic settings

Schema and Edit

A schema is a row description, it defines the number of fields to be processed and
passed on to the next component. The schema is either Built-in or stored remotely in the

Click Edit
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

Advanced settings

tStatCatcher Statistics

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

Global Variables

Global Variables

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.

NB_LINE: the number of rows processed. This is an After
variable and it returns an integer.

THREAD_ID: the ID of the thread this component is
processing. This is available as a Flow variable.

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 +
to access the variable list and choose the variable to use from it.

For further information about variables, see
Talend Studio

User Guide.


Usage rule

This component should be put after tPartitioner with the Start link connecting each other.

This component starts the parallel processes, in a Job, that you
design using other components.


Outgoing links (from this component to another):

Row: Main.

Incoming links (from one component to this one):

Trigger: Start.

For further information regarding connections, see

Talend Studio User

Related scenario

Document get from Talend https://help.talend.com
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