Rui Fan created FLINK-33960:
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Summary: Adaptive Scheduler doesn't respect the lowerBound for
tasks
Key: FLINK-33960
URL: https://issues.apache.org/jira/browse/FLINK-33960
Project: Flink
Issue Type: Bug
Components: Runtime / Coordination
Affects Versions: 1.17.2, 1.18.1
Reporter: Rui Fan
Assignee: Rui Fan
Adaptive Scheduler doesn't respect the lowerBound for tasks when one flink job
has more than 1 tasks.
When we using the adaptive scheduler and the rescale api, users will set the
lowerBound and upperBound for each job vertices. And users expect the
parallelism of all vertices between lowerBound and upperBound.
But when one flink job has more than 1 vertex, and resource isn't enough. Some
of lowerBound won't be respect.
h2. How to reproduce this bug:
One job has 3 job vertices, we set the resource requirements are:
* Vertex1: lowerBound=2, upperBound=2
* Vertex2: lowerBound=8, upperBound=8
* Vertex3: lowerBound=2, upperBound=2
They are same slotSharingGroup, and we only 5 available slots. This job
shouldn't run due to the slots cannot meets the resource requiremnt for vertex2.
But the job can runs, and the parallelism of vertex2 is 5.
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