Talend Tutorial Step By Step - Post 3: tHasInput and tHashOutput

Talend provides set of components (tHashInput & tHashOutput) to process huge amount of data at a very faster speed. The tHashInput component is part of the Technical family of component and allows you to quickly read row data from memory. that has previously been saved by tHashOutput

tHashInput

This component is used along with tHashOutput. It reads from the cache memory data loaded by tHashOutput. Together, these twin components offer high-speed data access to facilitate transactions involving a massive amount of data.

tHashOutput

This component writes data to the cache memory and is closely related to tHashInput. Together, these twin components offer high-speed data access to facilitate transactions involving a massive amount of data.

tHashOutput and tHashInput works in conjunction. They do not have any purpose if used separately. If you have a very huge data which you want to process multiple times at a very faster pace, then you can use tHashOutput component to write the data into cache memory and then read that data using tHashInput component.

Enabling tHashInput and tHashOutput

Many of the exercises rely on the use of tHashInput and tHashOutput components. Talend 5.2.3 does not automatically enable these components for use in jobs. To enable these components perform the instructions in the following section:

How to do it…

1. On the main menu bar navigate to File | Edit Project properties to open the properties dialogue.
2. Select Designer then Palette Settings.
3. Click on the Technical folder and then click on the button shown in the following screenshot to add this folder to the Show panel.

The following example shows that how to create tHashOutput and then get the data using tHashInput.

The following image shows that that how to create a sample tHashOutput

The following image shows that how to connect tHashOutput with tHashInput. One you run, you will see that same records are retrieved from tHashOutput. 

Cheers!