kfaraz opened a new pull request, #13367:
URL: https://github.com/apache/druid/pull/13367
### Description
Initial segment assignments can take very long due to the strategy cost
computation
for a large number of segments.
This PR addresses the issue by making the first assignment round-robin
within a tier.
Only segment balancing takes cost-based decisions to move segments around.
### Changes
- Add dynamic config `useRoundRobinSegmentAssignment` with default value
false
- Add `RoundRobinServerSelector`. This does not implement the
`BalancerStrategy`
as it does not conform to that contract and may also be used in conjunction
with a
strategy (round-robin for `RunRules` and strategy for `BalanceSegments`)
- Parameterize `LoadRuleTest` to test segment loading using both regular
balancer strategy
and round-robin
#### Release note
Add a round-robin segment strategy to speed up initial segment assignments.
Set `useRoundRobinSegmentAssigment` to `true` in the coordinator dynamic
config to enable this feature.
<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.
- [x] 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.
- [x] 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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