Details
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Improvement
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Status: Resolved
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Minor
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Resolution: Fixed
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1.19.0
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None
Description
When 'jobmanager.scheduler = adaptive' , job graph changes triggered by cluster expansion will cause long-term task stagnation. We should reduce this impact.
As an example:
I have jobgraph for : [v1 (maxp=10 minp = 1)] -> [v2 (maxp=10, minp=1)]
When my cluster has 5 slots, the job will be executed as [v1 p5]->[v2 p5]
When I add slots the task will trigger jobgraph changes，by
org.apache.flink.runtime.scheduler.adaptive.ResourceListener#onNewResourcesAvailable，
However, the five new slots I added were not discovered at the same time (for convenience, I assume that a taskmanager has one slot), because no matter what environment we add, we cannot guarantee that the new slots will be added at once, so this will cause onNewResourcesAvailable triggers repeatedly
，If each new slot action has a certain interval, then the jobgraph will continue to change during this period. What I hope is that there will be a stable time to configure the cluster resources and then go to it after the number of cluster slots has been stable for a certain period of time. Trigger jobgraph changes to avoid this situation