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Improve documentation for druid.coordinator.balancer.strategy option #17530

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rafitadiaz opened this issue Dec 2, 2024 · 2 comments · May be fixed by #17595
Open

Improve documentation for druid.coordinator.balancer.strategy option #17530

rafitadiaz opened this issue Dec 2, 2024 · 2 comments · May be fixed by #17595
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@kfaraz

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@rafitadiaz
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I see that in the configuration reference for the option druid.coordinator.balancer.strategy is mention that:

  • diskNormalized weights the costs according to the servers' disk usage ratios - there are known issues with this strategy distributing segments unevenly across the cluster.
  • random distributes segments among services randomly.

And then says that the default is cost.

What is cost? Cost base on what? Where can we find a reference on the documentation explaining the differences between 3 strategies?

It would be great a brief explanation of what is the cost strategy and why is the default
@kfaraz kfaraz self-assigned this Dec 21, 2024
@kfaraz kfaraz linked a pull request Dec 21, 2024 that will close this issue
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@kfaraz
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kfaraz commented Dec 21, 2024

Thanks for reporting this issue, @rafitadiaz !

I have created a PR #17595 to improve the docs.
You can see a preview here: https://github.com/apache/druid/blob/1105837763e7da29fba9f430dbe45d7d01618b5d/docs/design/coordinator.md#balancing-segments-in-a-tier

@rafitadiaz
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Ooohhh. Thanks 🙏🙏🙏🙏

This is super helpful and very well explained.

Thanks for the update!!!!

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Docs: Add details of cost balancer strategy kfaraz/druid
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@rafitadiaz @kfaraz