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| -rw-r--r-- | dogpile/cache/region.py | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/dogpile/cache/region.py b/dogpile/cache/region.py index c6a3e84..9e39498 100644 --- a/dogpile/cache/region.py +++ b/dogpile/cache/region.py @@ -218,6 +218,20 @@ class CacheRegion(object): :param expiration_time: optional expiration time which will overide the expiration time already configured on this :class:`.CacheRegion` if not None. To set no expiration, use the value -1. + + .. note:: + + the expiration_time argument here is **not guaranteed** to be + effective if multiple concurrent threads are accessing the same + key via :meth:`get_or_create` using different values + for ``expiration_time`` - the first thread within a cluster + of concurrent usages establishes the expiration time within a + :class:`.Dogpile` instance for the duration of those usages. + It is advised that all access to a particular key within a particular + :class:`.CacheRegion` use the **same** value for ``expiration_time``. + Sticking with the default expiration time configured for + the :class:`.CacheRegion` as a whole is expected to be the + usual mode of operation. """ if self.key_mangler: |