Manual:$wgMainStash
| Cache: $wgMainStash | |
|---|---|
| Replicated object cache setting |
|
| Introduced in version: | 1.26.0 (Gerrit change 207718; git #793d0140) |
| Removed in version: | Still in use |
| Allowed values: | One of the CACHE constants (see $wgMainCacheType) |
| Default value: | CACHE_DB (1.42+)'db-replicated' (1.26-1.41) |
| Other settings: Alphabetical | By function | |
Details
This setting controls the cache used by methods that store temporary values that need to be seen in all datacenters.
This is not true of $wgMainCacheType, which should be a fast and local-only cache.
Ideally, a better effort should be made to reduce evictions are data loss during power outages that main cache stores (e.g. redis with disk-persistence enabled and allkeys-lru).
Nevertheless, the store does not need to be a robust ACID compliant database, it should merely be a fast, memory-based, store that replicates data to all sites.
A modest amount of eviction or lost data (such as on fail-over) can be tolerated.