view mod_storage_multi/README.markdown @ 4023:7e2db4d61f6c

mod_easy_invite: backport: ensure session exists before accessing it Backport from https://github.com/snikket-im/snikket-server This prevents a 500 issue when using mod_register_web.
author Maxime “pep” Buquet <pep@bouah.net>
date Sun, 17 May 2020 22:38:55 +0200
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"`.