risingwave_stream::executor::exchange::permit

Struct MessageWithPermits

source 
pub struct MessageWithPermits {
    pub message: DispatcherMessage,
    pub permits: Option<Value>,
}
Expand description

Message with its required permits.

We store the permits in the struct instead of implying it from the message so that the permit number is totally determined by the sender and the downstream only needs to give the permits back verbatim, in case the version of the upstream and the downstream are different.

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§message: DispatcherMessage§permits: Option<Value>

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