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Posted to commits@druid.apache.org by GitBox <gi...@apache.org> on 2020/08/28 06:14:47 UTC
[GitHub] [druid] FrankChen021 opened a new issue #10329: Add support to show leader coordinator in `Services` web console view
FrankChen021 opened a new issue #10329:
URL: https://github.com/apache/druid/issues/10329
### Description
Add support to show leader coordinator in `Services` web console view
### Motivation
As we know, compared with standby coordinators, leader of coordinators does a lot of tasks such as checking whether to launch compaction tasks. To check whether these tasks are being processed correctly when debugging or solving problems, the first thing is to determine which coordinator right now is the leader.
Currently, there's no way to know which coordinator is the leader from the web console ui. One has to use `/druid/indexer/v1/leader` RESTful API to send request to any coordinator nodes to get the information of leader. It's not a intuitive way for users.
So, this proposal aims to simplify this by indicating which coordinator is leader on the web console.
There's two ways achieve this:
### Alternative 1
When switching to the `Services` view on web console, the frontend calls the `/druid/indexer/v1/leader` API to get the leader and then show the result in the `Tier` column of corresponding row in that view.
This is like the way current web console ui uses to show the last task status of middle manager in `Services` view
##### The Pros
No backend changes are involved.
##### The Cons
`/druid/indexer/v1/leader` must be sent to the coordinator, but the frontend can't sent this request util it gets services list from router through SQL query to know where coordinators locate. It's a little bit complex for the frontend.
### Alternative 2
When processing query on `sys.servers` table, broker calls `/druid/indexer/v1/leader` to get the leader and mark the leader coordinator in `tier` field. The frontend ui will automatically show the leader once there's value in `tier` property.
##### The Pros
No changes are involved in frontend but backend services.
Any discussion would be appreciated.
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[GitHub] [druid] FrankChen021 commented on issue #10329: Add support to show leader coordinator in `Services` web console view
Posted by GitBox <gi...@apache.org>.
FrankChen021 commented on issue #10329:
URL: https://github.com/apache/druid/issues/10329#issuecomment-916566843
Closed via #10951
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[GitHub] [druid] FrankChen021 closed issue #10329: Add support to show leader coordinator in `Services` web console view
Posted by GitBox <gi...@apache.org>.
FrankChen021 closed issue #10329:
URL: https://github.com/apache/druid/issues/10329
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