98a240cd99
## Development Environment Changes
* Added stringer to build deps
## New HTTP APIs
* Added scheduler worker config API
* Added scheduler worker info API
## New Internals
* (Scheduler)Worker API refactor—Start(), Stop(), Pause(), Resume()
* Update shutdown to use context
* Add mutex for contended server data
- `workerLock` for the `workers` slice
- `workerConfigLock` for the `Server.Config.NumSchedulers` and
`Server.Config.EnabledSchedulers` values
## Other
* Adding docs for scheduler worker api
* Add changelog message
Co-authored-by: Derek Strickland <1111455+DerekStrickland@users.noreply.github.com>
57 lines
2 KiB
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57 lines
2 KiB
Plaintext
{
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"$schema": "https://aka.ms/codetour-schema",
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"title": "Scheduler Worker - Hot Reload",
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"steps": [
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{
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"file": "nomad/server.go",
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"description": "## Server.Reload()\n\nServer configuration reloads start here.",
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"line": 782,
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"selection": {
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"start": {
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"line": 780,
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"character": 4
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},
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"end": {
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"line": 780,
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"character": 10
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}
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}
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},
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{
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"file": "nomad/server.go",
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"description": "## Did NumSchedulers change?\nIf the number of schedulers has changed between the running configuration and the new one we need to adopt that change in realtime.",
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"line": 812
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},
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{
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"file": "nomad/server.go",
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"description": "## Server.setupNewWorkers()\n\nsetupNewWorkers performs three tasks:\n\n- makes a copy of the existing worker pointers\n\n- creates a fresh array and loads a new set of workers into them\n\n- iterates through the \"old\" workers and shuts them down in individual\n goroutines for maximum parallelism",
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"line": 1482,
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"selection": {
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"start": {
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"line": 1480,
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"character": 4
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},
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"end": {
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"line": 1480,
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"character": 12
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}
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}
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},
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{
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"file": "nomad/server.go",
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"description": "Once all of the work in setupNewWorkers is complete, we stop the old ones.",
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"line": 1485
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},
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{
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"file": "nomad/server.go",
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"description": "The `stopOldWorkers` function iterates through the array of workers and calls their `Shutdown` method\nas a goroutine to prevent blocking.",
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"line": 1505
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},
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{
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"file": "nomad/worker.go",
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"description": "The `Shutdown` method sets `w.stop` to true signaling that we intend for the `Worker` to stop the next time we consult it. We also manually unpause the `Worker` by setting w.paused to false and sending a `Broadcast()` via the cond.",
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"line": 110
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}
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],
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"ref": "f-reload-num-schedulers"
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} |