Manual:$wgMainStash

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<translate> Cache</translate>: $wgMainStash
Replicated object cache setting
<translate> Introduced in version:</translate>	1.26.0 (Gerrit change 207718; git #793d0140)
<translate> Removed in version:</translate>	<translate> still in use</translate>
<translate> Allowed values:</translate>	One of the CACHE constants (see `$wgMainCacheType` )
<translate> Default value:</translate>	`CACHE_DB` (1.42+) `'db-replicated'` (1.26-1.41)
<translate> Other settings:</translate> <translate> Alphabetical</translate> \| <translate> By function</translate>

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.