libsql/replication: Improve tracing for client #323
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323: Replica connection wait for replication r=MarinPostma a=MarinPostma What this PR do is quite simple: it makes every replica database connection to wait for the replica instance to catch up with the last write that they performed. When a replica detects a write, this write is proxied to the primary, that executes it, and then starts replicating the state. The replica receives a response that contains a logical timestamp issued after the write was performed. The replica's connection keep this timestamp and on subsequent operation on the _local_ connection, waits until the replicator has applied changes up to the stored timestamp. Note that each connection holds a different timestamp, so a connection may proceed with a read, while another is still waiting. The basic guarantee that it gives is read your write: a connection is always guaranteed to witness it's write. In fact the guarantee is much stronger because of the underlying consistency of sqlite, the real-time consistency model of sqld is now as strong as `sequential consistency`. Co-authored-by: ad hoc <[email protected]>
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