Joe Smith created AURORA-1258:
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Summary: Improve procedure for adding instances to a job
Key: AURORA-1258
URL: https://issues.apache.org/jira/browse/AURORA-1258
Project: Aurora
Issue Type: Story
Components: Reliability, Usability
Reporter: Joe Smith
The current process for adding instances to a job is highly manual, and
potentially dangerous.
1. Take a config for a job with 10 instances, update it to 20 instances.
2. The batch size will be increased, and users will need to specify shards 10
to 19.
3. After this update is complete, users will need to manually update shards 0-9
again.
There may be other changes pulled in as part of this update other than just
increasing the number of instances, which could further complicate things.
One possible improvement would be to change the updater from 'under-provision'
where it kills instances first, then schedules new instances, to an
'over-provision' where it adds on new instances, then backpedals and kills the
old instances.
Overall, a single command or process for a user to take an already-existing job
and increase the number of instances would reduce overhead and fat-fingering.
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