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Merge pull request #64592 from ravisantoshgudimetla/revert-64364-remove-rescheduler
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Revert "Remove rescheduler and corresponding tests from master"

Reverts kubernetes/kubernetes#64364

After discussing with @bsalamat on how DS controllers(ref: https://github.com/kubernetes/kubernetes/pull/63223#discussion_r192277527) cannot create pods if the cluster is at capacity and they have to rely on rescheduler for making some space, we thought it is better to 

- Bring rescheduler back.
- Make rescheduler priority aware.
- If cluster is full and if **only** DS controller is not able to create pods, let rescheduler be run and let it evict some pods which have less priority.
- The DS controller pods will be scheduled now.

So, I am reverting this PR now. Step 2, 3 above are going to be in rescheduler.

/cc @bsalamat @aveshagarwal @k82cn 

Please let me know your thoughts on this. 

```release-note
Revert #64364 to resurrect rescheduler. More info https://github.com/kubernetes/kubernetes/issues/64725 :)
```
2018-06-04 16:56:11 -07:00
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