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Commit Graph

3 Commits

Author SHA1 Message Date
Luca Boccassi
cda667722c core: refresh unit cache when building a transaction if UNIT_NOT_FOUND
When a command asks to load a unit directly and it is in state
UNIT_NOT_FOUND, and the cache is outdated, we refresh it and
attempto to load again.
Use the same logic when building up a transaction and a dependency in
UNIT_NOT_FOUND state is encountered.
Update the unit test to exercise this code path.
2020-07-07 10:09:24 +02:00
Luca Boccassi
7233e91af0 core: store timestamps of unit load attempts
When the system is under heavy load, it can happen that the unit cache
is refreshed for an unrelated reason (in the test I simulate this by
attempting to start a non-existing unit). The new unit is found and
accounted for in the cache, but it's ignored since we are loading
something else.
When we actually look for it, by attempting to start it, the cache is
up to date so no refresh happens, and starting fails although we have
it loaded in the cache.

When the unit state is set to UNIT_NOT_FOUND, mark the timestamp in
u->fragment_loadtime. Then when attempting to load again we can check
both if the cache itself needs a refresh, OR if it was refreshed AFTER
the last failed attempt that resulted in the state being
UNIT_NOT_FOUND.

Update the test so that this issue reproduces more often.
2020-06-30 16:50:00 +02:00
Luca Boccassi
d904afc730 core: reload cache if it's dirty when starting a UNIT_NOT_FOUND unit
The time-based cache allows starting a new unit without an expensive
daemon-reload, unless there was already a reference to it because of
a dependency or ordering from another unit.
If the cache is out of date, check again if we can load the
fragment.
2020-05-30 16:50:05 +02:00