Issue
Index Pipeline and Query Pipeline stage editors do not open in the Fusion UI. When attempting to edit or view pipeline stages, the UI may appear unresponsive, partially load, or fail silently. Browser developer tools may show JavaScript errors or failed API requests.
Diagnosis
This issue commonly occurs when Fusion backend services responsible for serving the UI and pipeline APIs are unable to write temporary data to disk. In Kubernetes-based deployments, this condition is frequently associated with ephemeral storage exhaustion on one or more Fusion pods.
To confirm this condition, review the browser developer console for failed network requests or quota-related errors. Also review Kubernetes pod events and logs for warnings related to ephemeral storage usage or disk write failures.
Environment
Fusion 5.9.x and later
Kubernetes-based Fusion deployments, including managed and self-managed environments
Cause
Fusion UI and pipeline editors depend on backend microservices such as the API gateway, admin service, and query pipeline service. When these pods exceed their allocated ephemeral storage quota, Kubernetes prevents further disk writes.
As a result, UI-related API calls can fail without clear error messages in the Fusion UI, causing pipeline stage editors to stop functioning even though the overall cluster appears healthy.
Resolution
Identify pods affected by ephemeral storage limits
Check Kubernetes pod events and status for warnings indicating that ephemeral storage limits have been exceeded. Focus on pods related to the Fusion UI and API layer, including:
API gateway
Fusion admin service
Admin UI
Query pipeline service
Review pod logs using standard Kubernetes logging commands to confirm disk write failures or quota-related errors.
Restart affected Fusion pods
Restart the affected pods to clear ephemeral storage usage and restore normal operation of the Fusion UI. In Kubernetes, restarting pods reclaims ephemeral storage when containers are recreated.
After the pods restart, verify that Index Pipeline and Query Pipeline stage editors open correctly in the Fusion UI.