[YUNIKORN-117] Create event cache for scheduling events

• Type: Sub-task
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 0.9
• Component/s: core - cache, core - scheduler
• Labels: pull-request-available
• Target Version: 0.9
• Assignee: Adam Antal
• Reporter: Adam Antal
• Created: 30/Apr/20 14:00
• Updated: 21/Jan/22 21:47
• Resolved: 25/Jun/20 08:09

Description

Create a simple preliminary implementation of the event cache of YUNIKORN-42.

We have the following limited scope for this task:

• implement it as a separate process from the scheduler (similar to PartitionManager)
• only deal with queues and applications (the pods and nodes can be added later)
• only store the apps last visited time from the scheduler
• clean up those objects that haven't been visited in the last 24h

Other cache implementations can be also considered.

As a starting point, channels are a safe choice to have async communication with the scheduler without expecting bigger performance loss.

Issue Links

• links to: GitHub Pull Request #17
• links to: GitHub Pull Request #128
• links to: GitHub Pull Request #141