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2c308da4d2
Each postgres will use its own page cache with associated data structures. Postgres system_id is used to distinguish instances. That also means that backup should have valid system_id stashed somewhere. For now I put '42' as sys_id during S3 restore, but that ought to be fixed. Also this commit introduces new way of starting WAL receivers: postgres can initiate such connection by calling 'callmemaybe $url' command in the page_service -- that will start appropriate wal-redo and wal-receiver threads. This way page server may start without a priori knowledge of compute node addreses.
Zenith
Zenith substitutes PostgreSQL storage layer and redistributes data across a cluster of nodes
Running tests
git clone --recursive https://github.com/libzenith/zenith.git
./pgbuild.sh # builds postgres and installs it to ./tmp_install
cargo test