Dan Duvall aae7c326ef Use a mutex to prevent settings cache stampedes ... There are cases where probabilistic early expiry is not enough to prevent cache stampedes, most notably during a cold start/restart where the cache is not yet populated and during conditions where source I/O wait times may exceed the possible range of early expiry offset. To completely prevent cache stampedes from occurring, a mutex must be used around settings (re)caching. Early expiry is left in place as it should still be quite effective in reducing cache lock contention. Bug: T296771 Change-Id: I99676466ce1ad4f1622867158d2ed15ef9202ec2		2022-01-28 09:13:38 -08:00
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CacheableSource.php	Support stale cached settings for failover	2022-01-21 13:31:09 -08:00
CachedSource.php	Use a mutex to prevent settings cache stampedes	2022-01-28 09:13:38 -08:00