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[RFC] Hot reload channels configuration (size, pause, ...) stored in DB

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#765 コメント 13 件 リアクション 0 件 担当者 0 名 GitHub で見る

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まだ誰も着手していません。

評価

難易度
5/5
見積もり時間
1週間以上
初心者へのやさしさ
12/100
issue の種類
機能追加
明瞭さ
おおむね明確
活発さ
活発
技術スタック
postgresql, python

調査の方向性

This is an RFC for hot-reloading channel configuration stored in the queue.job.channel model, with a pg_notify 'reload' signal consumed by the jobrunner. Start with the jobrunner and Channel classes that handle the existing file/environment-variable configuration and the has_capacity() method the proposal changes. Done would mean the agreed design is implemented, with the is_paused behaviour and reload cycle covered by tests; the thread has 13 comments and no decision yet, so settle the design with maintainers first.

索引モデルが issue の本文から書いたものです。

説明

enhancement

Is your feature request related to a problem?

The configuration of the channels is stored in a configuration file/environment variable and need a restart of the jobrunner to be applied. This proposition aims to bring the possibility to change the configuration on the fly from the UI, which also offers new options such as pausing/resuming a channel.

Describe the solution you'd like

Add fields on queue.job.channel: capacity, sequential, throttle, running (boolean).

In the jobrunner startup, read configuration from model queue.job.channel, fallback on the current implementation based on file/environment variable.

In the queue.job.channel model, when one of the configuration field that concerns the jobrunner is changed, send a pg_notify in the same postgres channel (queue_job), but instead of a job uuid, send reload.

In the Jobrunner, when the payload is reload, go through a cycle close databases/replace the channel manager by a fresh one/configure channels/initialize databases (maybe not necessary to close/initialize database but we have to go through the steps to load all pending jobs in the channels).

Add the "paused" support in the Channel:

  • New is_paused=False parameter in Channel
  • A method is_paused() returns True if the current channel or any parent is paused
  • has_capacity() returns False if is_paused() returns True

Describe alternatives you've considered

/

Additional context

The cycle to update the channels can probably be optimized to prevent reloading all at once, but changes on the configuration should be are enough not to be a problem. Maybe if the only changes are in pause/resume, we can change the channels in place instead of recreating all the channels.

主要言語
Python
スター
271
フォーク
602
平均マージ
4日 4時間
マージ済み PR(30日)
6

環境構築

はじめの一歩

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  2. 着手することを issue にコメントします — 二人が同じ作業をするのを防げます。
  3. リポジトリをフォークし、ブランチを切って変更します。
  4. issue 番号を参照したプルリクエストを送ります。

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