Issue Summary

When migrating a large number of spaces (e.g. > 8k), if the plan detail page is kept open to monitor migration progress, the frequent background status polling can cause a performance degradation that impacts the overall health of the Confluence DC node.

Steps to Reproduce

1. Perform a migration in CCMA with a large number of spaces
2. Monitor the migration progress using the plan detail page

Expected Results

The UI will periodically update to show the migration progress.

Actual Results

The CCMA UI will not update, the Confluence DC node's performance may be degraded, and the below warning will be logged in the Tomcat catalina.out file:

10-Oct-2025 21:40:18.941 WARNING [Catalina-utility-1] org.apache.catalina.valves.StuckThreadDetectionValve.notifyStuckThreadDetected Thread [https-jsse-nio2-8443-exec-1304 url: /rest/migration/latest/plan/63ca7f8e-ccb9-4750-9273-f2ef271473cb; user: 123456] (id=[654321]) has been active for [184,847] milliseconds (since [10/10/25 9:37 PM]) to serve the same request for [https://confluence.[redacted].com/rest/migration/latest/plan/63ca7f8e-ccb9-4750-9273-f2ef271473cb] and may be stuck (configured threshold for this StuckThreadDetectionValve is [180] seconds). There is/are [155] thread(s) in total that are monitored by this Valve and may be stuck.

Workaround

Currently there is no known workaround for this behaviour. To prevent performance degradation do not leave the plan detail page open.