Previously, 'zenith init' would initialize a PostgreSQL cluster with
"initdb -D tmp", creating the temp cluster under current directory.
It moves the 'tmp' directory under the correct snapshot directory in
the zenith repository after that, but if something goes wrong in initdb,
or in the steps that follow, it could leave behind the 'tmp' directory
under current dir. Better to create the temporary directory under the
repository directory to begin with, as ".zenith/tmp".
- Move notifications to a separate job, run only on push.
- Build and test will execute on [pull_request, push].
- Use actions-rs/toolchain@v1 to get the rust toolchain.
- Add matrix hook to allow multiple toolchain versions in the future
(now set to [stable]).
- Run all the cargo tests, not just test_pageserver
Make the caller of request_redo() responsible for gathering the WAL records
to redo, and for storing the reconstructed page image back in the page
cache. This leaves the WAL redo manager purely responsible for dealing with
the postgres child process, removing its dependency on the PageCache.
Having multiple copies of the same values is a source of confusion.
Commit da9bf5dc63 fixed one race condition caused by that, for example.
See also discussion at
https://github.com/zenithdb/zenith/issues/57#issuecomment-824393470
This changes SeqWait.advance() to return the old number, and not panic if
you try to move the value backwards. The caller should check for that and
act accordingly.
Remove 'async' usage a much as feasible. Async code is harder to debug,
and mixing async and non-async code is a recipe for confusion and bugs.
There are a couple of exceptions:
- The code in walredo.rs, which needs to read and write to the child
process simultaneously, still uses async. It's more convenient there.
The 'async' usage is carefully limited to just the functions that
communicate with the child process.
- Code in walreceiver.rs that uses tokio-postgres to do streaming
replication. We have to use async there, because tokio-postgres is
async. Most rust-postgres functionality has non-async wrappers, but
not the new replication client code. The async usage is very limited
here, too: we use just block_on to call the tokio-postgres functions.
The code in 'page_service.rs' now launches a dedicated thread for each
connection.
This replaces tokio::sync:⌚:channel with std::sync:mpsc in
'seqwait.rs', to make that non-async. It's not a drop-in replacement,
though: std::sync::mpsc doesn't support multiple consumers, so we cannot
share a channel between multiple waiters. So this removes the code to
check if an existing channel can be reused, and creates a new one for
each waiter. That created another problem: BTreeMap cannot hold
duplicates, so I replaced that with BinaryHeap.
Similarly, the tokio::{mpsc, oneshot} channels used between WAL redo
manager and PageCache are replaced with std::sync::mpsc. (There is no
separate 'oneshot' channel in the standard library.)
Fixes github issue #58, and coincidentally also issue #66.
AtomicLsn is a wrapper around AtomicU64 that has load() and store()
members that are cheap (on x86, anyway) and can be safely used in any
context.
This commit uses AtomicLsn in the page cache, and fixes up some
downstream code that manually implemented LSN formatting.
There's also a bugfix to the logging in wait_lsn, which prints the
wrong lsn value.
