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https://issues.apache.org/jira/browse/IGNITE-21538?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexey Scherbakov updated IGNITE-21538:
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Summary: Rework component lifecycle mode to asynchronous (was: Remowk
component lifycycle mode to asynchronous)
> Rework component lifecycle mode to asynchronous
> -----------------------------------------------
>
> Key: IGNITE-21538
> URL: https://issues.apache.org/jira/browse/IGNITE-21538
> Project: Ignite
> Issue Type: Task
> Affects Versions: 3.0.0-beta2
> Reporter: Alexey Scherbakov
> Priority: Major
> Labels: ignite-3
> Fix For: 3.0
>
>
> Current design for comp lifecycle has issues:
> 1. It was designed for synchronous components, but almost all components are
> asynchronous.
> This causes to appear ugly things like inBusyLockAsync and inefficient code
> like
> public @Nullable TxStateMeta stateMeta(UUID txId) \{ return
> inBusyLock(busyLock, () -> txStateVolatileStorage.state(txId)); }
> 2. Currently it's not possible to do truly graceful node shutdown, because IO
> layer is disabled out-of-order, causing operation failures.
> I suggest to rework comp lifecycle to async model:
> 1. Each component tracks it's inflight async ops (as list of async chains)
> 2. On start components are initialized using CompletableFuture<Void>
> startAsync() method from root to leafs of dependency tree
> 3. On shutdown
> 3.1 CompletableFuture<Void>beforeShutdown is called on comp from leafs to
> root direction in dependency tree. This step waits for all active futures to
> complete. Any new operation return a future completed with
> NodeStoppingException
> 3.2 stop is called on comp from leafs to root direction in dependency tree.
> This step destroys component resources, like pools, etc.
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