kfaraz opened a new pull request, #13321:
URL: https://github.com/apache/druid/pull/13321
### Description
`cachingCost` strategy has some discrepancies when compared to cost strategy.
This PR addresses two of these by retaining the same behaviour as the `cost`
strategy
when computing the cost of moving a segment to a server:
- subtract the self cost of a segment if it is being served by the target
server
- subtract the cost of segments that are marked to be dropped
#### Release note
Fix issues with `cachingCost` balancer strategy.
<hr>
This PR has:
- [ ] been self-reviewed.
- [ ] using the [concurrency
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
(Remove this item if the PR doesn't have any relation to concurrency.)
- [ ] added documentation for new or modified features or behaviors.
- [ ] a release note entry in the PR description.
- [ ] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [ ] added or updated version, license, or notice information in
[licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md)
- [ ] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [ ] added unit tests or modified existing tests to cover new code paths,
ensuring the threshold for [code
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
is met.
- [ ] added integration tests.
- [ ] been tested in a test Druid cluster.
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