Till Rohrmann created FLINK-9455:
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Summary: Make SlotManager aware of multi slot TaskManagers
Key: FLINK-9455
URL: https://issues.apache.org/jira/browse/FLINK-9455
Project: Flink
Issue Type: Improvement
Components: ResourceManager
Affects Versions: 1.5.0
Reporter: Till Rohrmann
Fix For: 1.6.0, 1.5.1
The {{SlotManager}} responsible for managing all available slots of a Flink
cluster can request to start new {{TaskManagers}} if it cannot fulfill a slot
request. The started {{TaskManager}} can be started with multiple slots
configured but currently, the {{SlotManager}} thinks that it will be started
with a single slot. As a consequence, it might issue multiple requests to start
new TaskManagers even though a single one would be sufficient to fulfill all
pending slot requests.
In order to avoid requesting unnecessary resources which are freed after the
idle timeout, I suggest to make the {{SlotManager}} aware of how many slots a
{{TaskManager}} is started with. That way the SlotManager only needs to request
a new {{TaskManager}} if all of the previously started slots (potentially not
yet registered and, thus, future slots) are being assigned to slot requests.
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