sam marshall 79d0e63b18 MDL-78092 Cache: Modinfo locking with Redis store does not work
The feature added in 4.1 to lock the modinfo cache does not work when
using Redis, because:

* The API to acquire a cache lock is confusing, and the code did not
  check that it successfully acquired a lock before going on to build
  the cache anyway.

* Unlike the other types of cache lock, the Redis store did not retry
  the lock for a timeout period before giving up and failing.

This change fixes both points.
2023-05-22 10:45:13 +01:00
2023-05-19 21:13:57 +08:00

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