risingwave_meta::stream::stream_graph::actor

Struct ExternalChange

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struct ExternalChange {
    new_downstreams: HashMap<DispatcherId, Dispatcher>,
    new_upstreams: HashMap<GlobalId<{ IdCategory::Fragment }>, ActorUpstream>,
}
Expand description

The required changes to an existing external actor to build the graph of a streaming job.

For example, when we’re creating an mview on an existing mview, we need to add new downstreams to the upstream actors, by adding new dispatchers.

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§new_downstreams: HashMap<DispatcherId, Dispatcher>

The new downstreams to be added, indexed by the dispatcher ID.

§new_upstreams: HashMap<GlobalId<{ IdCategory::Fragment }>, ActorUpstream>

The new upstreams to be added (replaced), indexed by the upstream fragment ID.

Implementations§

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impl ExternalChange

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fn add_dispatcher(&mut self, dispatcher: Dispatcher)

Add a dispatcher to the external actor.

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fn add_upstream(&mut self, upstream: ActorUpstream)

Add an upstream to the external actor.

Trait Implementations§

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impl Default for ExternalChange

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fn default() -> ExternalChange

Returns the “default value” for a type. Read more

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