I had a large MSM rollout that began to encounter errors. Is it possible to cancel a rollout that is underway without restarting the author instance? Are there any useful management tools in the osgi console or JMX console related to rollouts?
The tools to fix MSM when something goes wrong are somewhat limited. Have asked this question to Adobe Engineering team continuously, have not heard definite answer on this yet.
Best possible way here:
Wait till it finishes rollout
Restarting can screw up AEM MSM index and leave you in a worse state then you started with.