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Added a tombstone comment to WANObjectCache

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Change-Id: Ia8c2fc4d4bbb741a6cd7aaa6f3ae433e65743b29
This commit is contained in:
Aaron Schulz 2015-08-13 15:54:44 -07:00
parent 3bf391e842
commit 72c493a3e4
1 changed files with 3 additions and 1 deletions
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includes/libs/objectcache/WANObjectCache.php
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@ -258,7 +258,9 @@ class WANObjectCache {
*
* This instantiates a hold-off period where the key cannot be
* written to avoid race conditions where dependent keys get updated
* with a stale value (e.g. from a DB slave).
* with a stale value (e.g. from a DB slave). This is implemented by
* storing a special "tombstone" value at the cache key that this
* class recognizes; get() calls will return false for the key.
*
* This should only be called when the underlying data (being cached)
* changes in a significant way. If called twice on the same key, then