view mod_storage_multi/README.markdown @ 3740:b3fb32bd1f01

mod_bookmarks2: Use the correct error when failing to retrieve bookmarks2 to reply to Private XML request.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Wed, 13 Nov 2019 16:27:50 +0100
parents a7fdab9c14e2
children
line wrap: on
line source

---
summary: Multi-backend storage module (WIP)
labels:
- NeedDocs
- Stage-Alpha
...

Introduction
============

This module attemtps to provide a storage driver that is really multiple
storage drivers. This could be used for storage error tolerance or
caching of data in a faster storage driver.

Configuration
=============

An example:

``` {.lua}
storage = "multi"
storage_multi_policy = "all"
storage_multi = {
    "memory",
    "internal",
    "sql"
}
```

Here data would be first read from or written to [mod\_storage\_memory],
then internal storage, then SQL storage. For reads, the first successful
read will be used. For writes, it depends on the `storage_multi_policy`
option. If set to `"all"`, then all storage backends must report success
for the write to be considered successful. Other options are `"one"` and
`"majority"`.