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This guide discusses issues experienced after upgrading to DHF 5.8.1 and Gradle 6.4, focusing on solving step failures post-upgrade in the MarkLogic environment.
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Solving DHF Steps Failing Post Upgrade: A Guide to Troubleshooting

Upgrading software often promises new functionalities, improvements, and bug fixes. However, it can also lead to challenges, especially when existing processes or integrations break. This was the experience for some MarkLogic users after upgrading to Data Hub Framework (DHF) 5.8.1 and Gradle 6.4. Following the upgrade, many began to experience failing steps or flows, with no error logs to explain why. In this guide, we will explore the underlying issues and detail the steps to resolve them.

Understanding the Problem

When the MarkLogic DHF is upgraded from version 5.2.0 to 5.8.1, and Gradle is upgraded from 5.2.1 to 6.4, any previously working data flows may suddenly start to fail. Here’s a quick summary of the situation experienced:

No Error Logs: Unlike the previous configuration that logged failures as JSON into a "Jobs" database, the upgraded versions fail silently without logging any errors.

Configuration Changes: The structure and contents of rewriter files appear to have changed dramatically between these versions, leading to speculation that they might be related to the failures.

Example Rewriter Files:

Before Upgrade:

/data-hub/5/rest-api/rewriter/10-rewriter.xml

/data-hub/5/rest-api/rewriter/9-rewriter.xml

/data-hub/5/tracing/10-tracing-rewriter.xml

/data-hub/5/tracing/9-tracing-rewriter.xml

After Upgrade:

/data-hub/5/data-services/system/createCustomRewriters.api

/data-hub/5/data-services/system/createCustomRewriters.xqy

/data-hub/5/rest-api/jobs-rewriter.xml

/data-hub/5/rest-api/staging-rewriter.xml

The Solution: Fixing the Steps

Fortunately, there is a solution to restore functionality after the upgrade. The primary resolution found was to upgrade the MarkLogic Java Client API. By aligning it with the new versions of DHF and Gradle, users were able to rectify the problems with failing steps. Below are more details on this approach:

1. Upgrade the MarkLogic Java Client API

Ensure that you have the latest version of the MarkLogic Java Client API compatible with your DHF 5.8.1 & Gradle 6.4 upgrade.

Verify that the changes in the client API will support your existing workflows and integrations.

2. Verify Environment Configuration

Review your environment setup to ensure all necessary dependencies are correctly configured.

Ensure that all rewrite files and configurations are as expected and have not been inadvertently changed during the upgrade process.

3. Test Flows Individually

Run individual steps or flows to identify which specific operations are causing issues.

Utilize logging at various points in your flow to identify where the process might be failing without displaying error messages.

4. Consult Documentation

Check the official MarkLogic and DHF documentation for any additional required changes or configurations needed for the upgraded version.

5. Seek Community Help

Engage with the MarkLogic user community or forums for insights from others who might have encountered similar issues post-upgrade.

Conclusion

Software upgrades, while beneficial, can sometimes lead to unexpected issues. If you’re facing failing steps after upgrading to DHF 5.8.1 and Gradle 6.4, the key takeaway is that updating the MarkLogic Java Client API can resolve many of these problems. Alongside reviewing configurations and engaging with the user community, you can quickly return to a stable and functional data hub environment.

By following these troubleshooting steps, you’ll be better equipped to handle upgrade-related challenges, ensuring a smoother path to incorporating new functionalities and enhancements into your system.