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# ⚠️ Breaking Many deprecated queue config options are removed (actually, they should have been removed in 1.18/1.19). If you see the fatal message when starting Gitea: "Please update your app.ini to remove deprecated config options", please follow the error messages to remove these options from your app.ini. Example: ``` 2023/05/06 19:39:22 [E] Removed queue option: `[indexer].ISSUE_INDEXER_QUEUE_TYPE`. Use new options in `[queue.issue_indexer]` 2023/05/06 19:39:22 [E] Removed queue option: `[indexer].UPDATE_BUFFER_LEN`. Use new options in `[queue.issue_indexer]` 2023/05/06 19:39:22 [F] Please update your app.ini to remove deprecated config options ``` Many options in `[queue]` are are dropped, including: `WRAP_IF_NECESSARY`, `MAX_ATTEMPTS`, `TIMEOUT`, `WORKERS`, `BLOCK_TIMEOUT`, `BOOST_TIMEOUT`, `BOOST_WORKERS`, they can be removed from app.ini. # The problem The old queue package has some legacy problems: * complexity: I doubt few people could tell how it works. * maintainability: Too many channels and mutex/cond are mixed together, too many different structs/interfaces depends each other. * stability: due to the complexity & maintainability, sometimes there are strange bugs and difficult to debug, and some code doesn't have test (indeed some code is difficult to test because a lot of things are mixed together). * general applicability: although it is called "queue", its behavior is not a well-known queue. * scalability: it doesn't seem easy to make it work with a cluster without breaking its behaviors. It came from some very old code to "avoid breaking", however, its technical debt is too heavy now. It's a good time to introduce a better "queue" package. # The new queue package It keeps using old config and concept as much as possible. * It only contains two major kinds of concepts: * The "base queue": channel, levelqueue, redis * They have the same abstraction, the same interface, and they are tested by the same testing code. * The "WokerPoolQueue", it uses the "base queue" to provide "worker pool" function, calls the "handler" to process the data in the base queue. * The new code doesn't do "PushBack" * Think about a queue with many workers, the "PushBack" can't guarantee the order for re-queued unhandled items, so in new code it just does "normal push" * The new code doesn't do "pause/resume" * The "pause/resume" was designed to handle some handler's failure: eg: document indexer (elasticsearch) is down * If a queue is paused for long time, either the producers blocks or the new items are dropped. * The new code doesn't do such "pause/resume" trick, it's not a common queue's behavior and it doesn't help much. * If there are unhandled items, the "push" function just blocks for a few seconds and then re-queue them and retry. * The new code doesn't do "worker booster" * Gitea's queue's handlers are light functions, the cost is only the go-routine, so it doesn't make sense to "boost" them. * The new code only use "max worker number" to limit the concurrent workers. * The new "Push" never blocks forever * Instead of creating more and more blocking goroutines, return an error is more friendly to the server and to the end user. There are more details in code comments: eg: the "Flush" problem, the strange "code.index" hanging problem, the "immediate" queue problem. Almost ready for review. TODO: * [x] add some necessary comments during review * [x] add some more tests if necessary * [x] update documents and config options * [x] test max worker / active worker * [x] re-run the CI tasks to see whether any test is flaky * [x] improve the `handleOldLengthConfiguration` to provide more friendly messages * [x] fine tune default config values (eg: length?) ## Code coverage: 
48 lines
1.9 KiB
Handlebars
48 lines
1.9 KiB
Handlebars
{{template "admin/layout_head" (dict "ctxData" . "pageClass" "admin monitor")}}
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<div class="admin-setting-content">
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<h4 class="ui top attached header">
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{{.locale.Tr "admin.monitor.queue" .Queue.GetName}}
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</h4>
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<div class="ui attached table segment">
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<table class="ui very basic striped table">
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<thead>
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<tr>
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<th>{{.locale.Tr "admin.monitor.queue.name"}}</th>
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<th>{{.locale.Tr "admin.monitor.queue.type"}}</th>
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<th>{{.locale.Tr "admin.monitor.queue.exemplar"}}</th>
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<th>{{.locale.Tr "admin.monitor.queue.numberworkers"}}</th>
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<th>{{.locale.Tr "admin.monitor.queue.maxnumberworkers"}}</th>
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<th>{{.locale.Tr "admin.monitor.queue.numberinqueue"}}</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>{{.Queue.GetName}}</td>
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<td>{{.Queue.GetType}}</td>
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<td>{{.Queue.GetItemTypeName}}</td>
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<td>{{$sum := .Queue.GetWorkerNumber}}{{if lt $sum 0}}-{{else}}{{$sum}}{{end}}</td>
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<td>{{if lt $sum 0}}-{{else}}{{.Queue.GetWorkerMaxNumber}}{{end}}</td>
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<td>{{$sum = .Queue.GetQueueItemNumber}}{{if lt $sum 0}}-{{else}}{{$sum}}{{end}}</td>
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</tr>
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</tbody>
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</table>
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</div>
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<h4 class="ui top attached header">
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{{.locale.Tr "admin.monitor.queue.settings.title"}}
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</h4>
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<div class="ui attached segment">
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<p>{{.locale.Tr "admin.monitor.queue.settings.desc"}}</p>
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<form method="POST" action="{{.Link}}/set">
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{{$.CsrfTokenHtml}}
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<div class="ui form">
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<div class="inline field">
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<label for="max-number">{{.locale.Tr "admin.monitor.queue.settings.maxnumberworkers"}}</label>
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<input name="max-number" type="text" placeholder="{{.locale.Tr "admin.monitor.queue.settings.maxnumberworkers.placeholder" .Queue.GetWorkerMaxNumber}}">
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</div>
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<button class="ui submit button">{{.locale.Tr "admin.monitor.queue.settings.submit"}}</button>
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</div>
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</form>
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</div>
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</div>
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{{template "admin/layout_footer" .}}
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