# tFlowMeterCatcher

Operates as a log function triggered by the use of a tFlowMeter component in the Job.

Based on a defined schema, the tFlowMeterCatcher catches the processing volumetric from the tFlowMeter component and passes them on to the output component.

## tFlowMeterCatcher Standard properties

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

The Standard tFlowMeterCatcher component belongs to the Logs & Errors family.

The component in this framework is available in all Talend products.

## Basic settings

| Properties | Description |
| --- | --- |
| Schema and Edit<br>Schema | <ul> <li> <p>A schema is a row description, it defines the fields to be                                processed and passed on to the next component. In this particular                                case, the schema is read-only, as this component gathers standard                                log information including:</p> </li> <li> <p> <span>Moment</span>: Processing time and date                            </p> </li> <li> <p> <span>Pid</span>: Process ID</p> </li> <li> <p> <span>Father_pid</span>: Process ID of the                                father Job if applicable. If not applicable, Pid is                                duplicated.</p> </li> <li> <p> <span>Root_pid</span>: Process ID of the root                                Job if applicable. If not applicable, pid of current Job is                                duplicated.</p> </li> <li> <p> <span>System_pid</span>: Process id generated                                by the system</p> </li> <li> <p> <span>Project:</span> Project name, the Job                                belongs to.</p> </li> <li> <p> <span>Job</span>: Name of the current                                Job</p> </li> <li> <p> <span>Job_repository_id</span>: ID generated                                by the application.</p> </li> <li> <p> <span>Job_version</span>: Version number of                                the current Job</p> </li> <li> <p> <span>Context</span>: Name of the current                                context</p> </li> <li> <p> <span>Origin</span>: Name of the component if                                any</p> </li> <li> <p> <span>Label</span>: Label of the row                                connection preceding the <span>tFlowMeter</span>                                component in the Job, and that will be analyzed for                                volumetrics.</p> </li> <li> <p> <span>Count</span>: Actual number of rows                                being processed </p> </li> <li> <p> <span>Reference</span>: Number of rows passing                                the reference link.</p> </li> <li> <p> <span>Thresholds</span>: Only used when the                                relative mode is selected in the <span>tFlowMeter</span> component. </p> </li> </ul> |

## Global Variables

| Variables | Description |
| --- | --- |
| Global Variables | ERROR\_MESSAGE: the error message generated by the<br>component when an error occurs. This is an After variable and it returns a string. This<br>variable functions only if the Die on error checkbox is<br>cleared, if the component has this checkbox.<br><br>A Flow variable functions during the execution of a component<br>while an After variable functions after the execution of the component.<br><br>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<br>it.<br><br>For more information about variables, see [Using contexts and variables](https://help.qlik.com/talend/r/en-US/8.0/studio-user-guide/contexts-and-variables). |

## Usage

| Usage guidance | Description |
| --- | --- |
| **Usage rule** | This component is the start component of a secondary Job which<br>triggers automatically at the end of the main Job. |
| Limitation | The use of this component cannot be separated from the use of the<br>tFlowMeter. For more<br>information, see [tFlowMeter](https://help.qlik.com/talend/en-US/components/8.0/logs-and-errors/tflowmeter) |

**Related concepts**

* [Catching flow metrics from a Job](https://help.qlik.com/talend/en-US/components/8.0/logs-and-errors/tflowmeter-tflowmetercatcher-tmysqlinput-catching-flow-metrics-from-job-standard-component-the)