Implement replacing table plan in meta service. #7908
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Feb 16, 2023
This PR extends the new actor graph builder introduced in #7659 for replacing table plan, and adds the procedure of preparing the `TableFragments`. Note that the RPC with the compute nodes is not implemented so this is not utilized by the frontend yet. Building an actor graph for schema change can be similar and symmetric to the MV on MV. - For MV on MV, we have existing upstream `Materialize` fragments that give the requirements to the distribution of current `Chain`. We'll generate new dispatchers for the upstream `Materialize` in the result. - For replacing table plan for schema change, we (may) have existing downstream `Chain` fragments that give the requirements to the distribution of current `Materialize`. We'll generate updates for the merger for the downstream `Chain` in the result. Related: - #7908 Approved-By: chenzl25 Approved-By: yezizp2012
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Feb 21, 2023
The hanging channel is a channel that's external for a table fragments subgraph. We introduced this for MV on MV long ago, but after #4045 and #6170, this becomes not that necessary: we can simply create a pair of channels if not found in the `ChannelPool`. https://github.com/risingwavelabs/risingwave/blob/b1891423a68b98dff39d7220a891cdea8bd67951/src/stream/src/task/mod.rs#L123-L138 This is a preparation step for #7908. Approved-By: yezizp2012
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