There are two types of Message Handlers in DataStage.
Project-Level Message Handlers: These are installed in an application directory per Engine and and aren't supported by MettleCI so should be deployed manually.
Job-Level Message Handlers: There is a MettleCI plugin to support their deployment only. While MettleCI deploys Job-Level Message Handler files from a Project's Git repository, it doesn't offer native check-in and deletion functions for them (as they are not “DataStage assets”, see Why do Data Migrators suggest switching away from Message Handlers? for more information) so they must be managed via command line Git.
Message Handler Deployment Plug-In
There is a Bamboo Plugin to support deployment of Job-Level Message Handlers: dm-dsmsgh-plugin. Installing this plugin enables the DataStage Message Handlers Bamboo Task. There is also corresponding MettleCI CLI command isx message-handlers as well, see ISX Message-Handlers Command for more information.
The Plugin includes a task that will read all Message Handlers that follow the <Job Name>.msh naming convention and "inject" them into the ISX file of the corresponding Job during deployment. The updated ISX file can then be deployed like normal, resulting in both the Job design and Job-Level Message Handler ending up in the target DataStage instance.
In order to use this MettleCI feature:
All Job-Level Message Handlers in a particular DataStage Project will need to be added to the corresponding Git repository, alongside the existing ISX files. These files need to be named following the
<Job Name>.mshconvention.Continuous Integration Build Plans and Deployment Environments in Bamboo will need to be updated to execute the new "DataStage Message Handlers Task" immediately before the "DataStage Incremental Deployment Task".
After each Message Handler is added to Git, you will need to re-check-in the corresponding Jobs. This is necessary to ensure that the subsequent CI Build Plan deployment (triggered by the check-in) will process the Message Handler.
No change to Bamboo Deployment Environment configuration is required.
How to find the relevant Local.msh file for a given Job in the Information Server File System.
Example: There is a Job called “GR_ACCOUNTS_LOCAL"
Within the relevant Project directory, find the
RT_SC<Job Number>directory that corresponds to the Job. The simplest method is to use Director to open up a log entry for the Job then get the "Job No." entry from that dialog box.
Within the
RT_SC<Job Number>directory, find the Job-Level Message Handler config file (Local.msh)Once found, copy and rename that file to
GR_ACCOUNTS_LOCAL.mshand check it into Git alongside the existing ISX file
Once this file has been checked in, re-check in the corresponding Job. This ensures that automated deployments pick it up.
The (updated) Continuous Integration Bamboo Plan for the corresponding DataStage Project will be auto-triggered and must complete successfully. This will ensure that subsequent deployments to downstream environments (e.g. Test, QA, Production) will include Job-Level Message Handlers.
Changes to CI Plans
Continuous Integration Build Plans in Bamboo will need to be updated to execute the "DataStage Message Handlers" Task.
Once you have deployed the dm-dsmsgh-plugin plugin .jar to Bamboo, you will be able to add a 'DataStage Message Handlers' Task to an existing Continuous Integration Build Plan.
Ensure the new Task is immediately before the "Incremental DataStage Deployment" Task.
Both the 'Root ISX directory' and 'Root message handler directory' fields must contain the following text: datastage.
These techniques will let you manage and deploy your Job-Level Message Handlers. We suggest that where possible you migrate away from using message handlers as discussed in Why do Data Migrators suggest switching away from Message Handlers?