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Add single node Raft metadata store with memory storage #1790

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@tillrohrmann tillrohrmann commented Aug 6, 2024

This commit adds the skeleton of the Raft metadata store. At the moment
only a single node with memory storage is supported.

This fixes #1785.

This commit makes it configurable which metadata will be run
by the Node when starting the Restate server.
This commit adds the skeleton of the Raft metadata store. At the moment
only a single node with memory storage is supported.

This fixes restatedev#1785.
The raft metadata store does not accept new proposals if there is
no known leader. In this situation, request failed with an internal
ProposalDropped error. This commit changes the behavior so that a
ProposalDropped error will be translated into an unavailable Tonic
status. That way, the request will get automatically retried.
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Explore usage of raft-rs for building a Raft based metadata store
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