The contract for wait_for() was not very clear. It waits until the
given function returns successfully, without an exception, but the
wait_for_last_record_lsn() and wait_for_upload() functions used "a <
b" as the condition, i.e. they thought that wait_for() would poll
until the function returns true.
Inline the logic from wait_for() into those two functions, it's not
that complicated, and you get a more specific error message too, if it
fails. Also add a comment to wait_for() to make it more clear how it
works.
Also change remote_consistent_lsn() to return 0 instead of raising an
exception, if remote is None. That can happen if nothing has been
uploaded to remote storage for the timeline yet. It happened once in
the CI, and I was able to reproduce that locally too by adding a sleep
to the storage sync thread, to delay the first upload.
* Add --id argument to safekeeper setting its unique u64 id.
In preparation for storage node messaging. IDs are supposed to be monotonically
assigned by the console. In tests it is issued by ZenithEnv; at the zenith cli
level and fixtures, string name is completely replaced by integer id. Example
TOML configs are adjusted accordingly.
Sequential ids are chosen over Zid mainly because they are compact and easy to
type/remember.
* add node id to pageserver
This adds node id parameter to pageserver configuration. Also I use a
simple builder to construct pageserver config struct to avoid setting
node id to some temporary invalid value. Some of the changes in test
fixtures are needed to split init and start operations for envrionment.
Co-authored-by: Arseny Sher <sher-ars@yandex.ru>
This patch includes attach/detach http endpoints in pageservers. Some
changes in callmemaybe handling inside safekeeper and an integrational
test to check migration with and without load. There are still some
rough edges that will be addressed in follow up patches
