Support configurable ExchangeManager

[yangshangqing95]

Description

This PR adds support for configuring the location of the Exchange Manager configuration file.
Users can now specify a custom path for the Exchange Manager config file, which allows for more flexible deployment and easier configuration management.

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Additional context and related issues

Closes #26611

#26611

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Release notes

(x) Release notes are required, with the following suggested text:

## General
* Add support for specifying the location of the Exchange Manager configuration file. ({issue}`26611`)

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[wendigo]

Personally, I don't think that we want change like that. It doesn't solve any particular issue, at least none that is highlighted in that PR. How does it make deployment more flexible?

[wendigo]

.

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[losipiuk]

Personally, I don't think that we want change like that. It doesn't solve any particular issue, at least none that is highlighted in that PR. How does it make deployment more flexible?

I agree.

[yangshangqing95]

Personally, I don't think that we want change like that. It doesn't solve any particular issue, at least none that is highlighted in that PR. How does it make deployment more flexible?

Hi @wendigo @losipiuk Thanks for reviewing the PR!

Let me clarify the motivation — the goal is to make deployments in containerized/Kubernetes environments more flexible.

issue link: #26611

Today ExchangeManagerRegistry always looks for
/etc/exchange-manager.properties, which creates a few practical issues:

In Kubernetes, configuration is usually mounted from Secrets or Vault Agent sidecars, and the target path is not always /etc/trino (sometimes it’s a read-only volume or gets replaced by the image build).

Helm charts and operators often template configs into arbitrary paths; to use exchange manager we currently have to copy/patch them into /etc/trino, which breaks immutability and complicates upgrades.

Other Trino subsystems (e.g. access-control.config-files, event-listener.config-files) already allow a custom location; but this component still relies on a hardcoded path.

By adding an optional property
exchange-manager.config-file=/path/to/exchange-manager.properties
we keep the existing default for backward compatibility, but remove the need to rebuild the image or override /etc/trino when running on K8s or integrating with Vault Agent.

So the change doesn’t affect default users, but gives operators more flexibility and aligns this component with the rest of the configuration system.

Would that address the concern about “no particular issue”? Happy to update the PR description.

[yangshangqing95]

Hi @ebyhr Documentation has been added to reflect the new exchange-manager.config-file option, please help review, thank you!

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[github-actions]

This pull request has gone a while without any activity. Ask for help on #core-dev on Trino slack.

[wendigo]

@cla-bot check

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[losipiuk]

rebsed

[martint]

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discussed