lxd: Make the LXD shutdown sequence more concurrent to avoid long-running operations blocking unrelated instances shutdown #15016
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@tomponline we can start discussing the approach. I mark it as draft as I'm stillin the process to test it but just wanted to let you know about my idea. @simondeziel what was the test setup you used so that I can reproduce a bunch of long running operations and start testing this appraoch. |
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It's been a while and it seems it was an image refresh taking longer than usual. I think mimic something akin with: Then |
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ShellCheck found more than 20 potential problems in the proposed changes. Check the Files changed tab for more details.
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If one wants to reproduce the tests: this should be working https://paste.ubuntu.com/p/MGxxJz35N7/ (still fuguring out why this is different in the CI) |
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@tomponline fixed the comments. Tests are green. |
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few minor changes and a question, thanks!
`pendingInstanceOperations` is only used in the LXD shutdown sequence Stop() function at it is a blocking function. We replace it by a non-blocking function that simply populate a map of instance URL to their operation. It is also worth mentionning that once the LXD shutdown sequence is triggered, no more operation can be added, so I don't see the use of "waiting". Signed-off-by: Gabriel Mougard <[email protected]>
…(staticcheck)`) Signed-off-by: Gabriel Mougard <[email protected]>
We will no longer call `daemonStorageVolumesUnmount` in a separate goroutine but after the instancesShutdown function. However, we still need to be able to cancel the volume unmount after a timeout, hence the introduction of the 'select' statement with a context handling. This change also enable a context to cancel an ongoing unmount procedure. Signed-off-by: Gabriel Mougard <[email protected]>
…sShutdown` function * `isInstanceBusy`: check if an instance has a running op tied to it. Signed-off-by: Gabriel Mougard <[email protected]>
This enables `instancesShutdown` to react upon operation changes (from busy to idle) and to context cancellation while keeping the shutdown order correct if instances have `boot.stop.priority` set. Signed-off-by: Gabriel Mougard <[email protected]>
Signed-off-by: Gabriel Mougard <[email protected]>
For the testing phase, we need a convenient way to create dummy operations in LXD with a certain duration. Signed-off-by: Gabriel Mougard <[email protected]>
… tests Signed-off-by: Gabriel Mougard <[email protected]>
Signed-off-by: Gabriel Mougard <[email protected]>
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| for i := 0; i < maxConcurrent; i++ { | ||
| go func(instShutdownCh <-chan instance.Instance) { | ||
| for inst := range instShutdownCh { | ||
| logger.Debug("Instance received for shutdown", logger.Ctx{"project": inst.Project().Name, "instance": inst.Name(), "timestamp": time.Now().UnixNano()}) |
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@gabrielmougard are the new timestamp nano second fields required, they are rather noisy.
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closes: #13460
JIRA ticket: https://warthogs.atlassian.net/browse/LXD-2600