RearrangedChainExecutor

risingwave_stream::executor

Struct RearrangedChainExecutor 

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pub struct RearrangedChainExecutor {
    snapshot: Executor,
    upstream: Executor,
    progress: CreateMviewProgressReporter,
    actor_id: ActorId,
}
Expand description

ChainExecutor is an executor that enables synchronization between the existing stream and newly appended executors. Currently, ChainExecutor is mainly used to implement MV on MV feature. It pipes new data of existing MVs to newly created MV only all of the old data in the existing MVs are dispatched.

RearrangedChainExecutor resolves the latency problem when creating MV with a huge amount of existing data, by rearranging the barrier from the upstream. Check the design doc for details.

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§snapshot: Executor§upstream: Executor§progress: CreateMviewProgressReporter§actor_id: ActorId

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impl RearrangedChainExecutor

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pub fn new( snapshot: Executor, upstream: Executor, progress: CreateMviewProgressReporter, ) -> Self

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fn execute_inner( self, ) -> impl Stream<Item = Result<Message, StreamExecutorError>>

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fn rearrange_barrier<'_async0, U>( upstream: &'_async0 mut U, upstream_tx: UnboundedSender<RearrangedMessage>, stop_rearrange_rx: Receiver<()>, ) -> impl Stream<Item = Result<Barrier, StreamExecutorError>> + '_async0
where U: MessageStream + Unpin,

Rearrangement stream. The upstream: U will be taken out from the mutex, then put back after stopped.

Check execute_inner for more details.

Trait Implementations§

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impl Execute for RearrangedChainExecutor

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fn execute(self: Box<Self>) -> BoxedMessageStream

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fn execute_with_epoch(self: Box<Self>, _epoch: u64) -> BoxedMessageStream

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fn boxed(self) -> Box<dyn Execute>
where Self: Sized + Send + 'static,

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