Now princeple is following: acceptor threads (libpq and http) error will
bring the pageserver down, but all per-tenant thread failures will be treated
as an error.
A new `get_lsn_by_timestamp` command is added to the libpq page service
API.
An extra timestamp field is now stored in an extra field after each
Clog page. It is the timestamp of the latest commit, among all the
transactions on the Clog page. To find the overall latest commit, we
need to scan all Clog pages, but this isn't a very frequent operation
so that's not too bad.
To find the LSN that corresponds to a timestamp, we perform a binary
search. The binary search starts with min = last LSN when GC ran, and
max = latest LSN on the timeline. On each iteration of the search we
check if there are any commits with a higher-than-requested timestamp
at that LSN.
Implements github issue 1361.
* Traverse frozen layer in get_reconstruct_data in reverse order
* Fix comments on frozen layers.
Note explicitly the order that the layers are in the queue.
* Add fail point to reproduce failpoint iteration error
Co-authored-by: Heikki Linnakangas <heikki@neon.tech>
Previously we've used table interface, but there was no easy way to pass
it as an override to pageserver through cli. Use the same strategy as
for remote storage config parsing
Add tenant config API and 'zenith tenant config' CLI command.
Add 'show' query to pageserver protocol for tenantspecific config parameters
Refactoring: move tenant_config code to a separate module.
Save tenant conf file to tenant's directory, when tenant is created to recover it on pageserver restart.
Ignore error during tenant config loading, while it is not supported by console
Define PiTR interval for GC.
refer #1320
This depends on a hacked version of the 'pprof-rs' crate. Because of
that, it's under an optional 'profiling' feature. It is disabled by
default, but enabled for release builds in CircleCI config. It doesn't
currently work on macOS.
The flamegraph is written to 'flamegraph.svg' in the pageserver
workdir when the 'pageserver' process exits.
Add a performance test that runs the perf_pgbench test, with profiling
enabled.
We only checked the cache page version when collecting WAL records in
an in-memory layer, not in a delta layer. Refactor the code so that we
always stop collecting WAL records when we reach a cached materialized
page.
Fix the assertion on the LSN range in
InMemoryLayer::get_value_reconstruct_data. It was supposed to check
that the requested LSN range is within the layer's LSN range, but the
inequality was backwards. That went unnoticed before, because the
caller always passed the layer's start LSN as the requested LSN
range's start LSN, but now we might stop the search earlier, if we have
a cached page version.
Co-authored-by: Konstantin Knizhnik <knizhnik@zenith.tech>
Unlink failure isn't serious on its own, we were about to remove the
file anyway, but it shouldn't happen and could be a symptom of
something more serious.
We just saw "No such file or directory" errors happening from
ephemeral file writeback in staging, and I suspect if we had this
warning in place, we would have seen these warnings too, if the
problem was that the ephemeral file was removed before dropping the
EphemeralFile struct. Next time it happens, we'll have more
information.
