Struct mz_environmentd::deployment::state::DeploymentState

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pub struct DeploymentState {
    inner: Arc<Mutex<DeploymentStateInner>>,
}
Expand description

The state of an environment deployment.

This object should be held by the environmentd server. It provides methods to handle state transitions that should be driven by the server itself.

A deployment begins in the Initializing state.

If, during initialization, the server realizes that it is taking over from a failed environmentd process of a generation that is already the leader, the server may proceed directly to the IsLeader state, via DeploymentState::set_is_leader.

Otherwise, the server should leave the deployment state in Initializing while performing initialization activities. Once the server is catching up its workloads, it should proceeded to the CatchingUp state. Once the environment is ready to take over from the prior generation, the server should call DeploymentState::set_ready_to_promote. After this, the server should not call DeploymentState::set_is_leader, as an external orchestrator will determine when promotion occurs. The future returned by set_ready_to_promote will resolve when promotion has occurred and the deployment should take over from the prior generation and begin serving queries.

Fields§

§inner: Arc<Mutex<DeploymentStateInner>>

Implementations§

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impl DeploymentState

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pub fn new() -> (DeploymentState, DeploymentStateHandle)

Creates a new LeaderState for a deployment.

Returns the state and a handle to the state.

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pub fn set_catching_up(&self) -> impl Future<Output = ()>

Marks the deployment as catching up.

Returns a future that resolves if the catch up phase should be skipped.

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pub fn set_ready_to_promote(&self) -> impl Future<Output = ()>

Marks the deployment as ready to be promoted to leader.

Returns a future that resolves when the leadership promotion occurs. When the function returns, the state will be ReadyToPromote. When the returned future resolves, the state will be Promoting.

Panics if the leader state is not Initializing.

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pub fn set_is_leader(&self)

Marks the deployment as the leader.

Panics if the leader state is not Initializing or Promoting.

Trait Implementations§

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impl Clone for DeploymentState

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fn clone(&self) -> DeploymentState

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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