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mod_storage_multi/README.markdown @ 4282:281a864e7472

mod_pubsub_feeds: Don't skip publishing items after an existing one I encountered a feed which was backwards, such that older entries were considered first and then it would skip newer entries. This may however run into trouble if the feed contains more items than what's persisted in pubsub.
author Kim Alvefur <zash@zash.se>
date Mon, 30 Nov 2020 15:17:29 +0100
parent 1887:a7fdab9c14e2
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1 ---
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2 summary: Multi-backend storage module (WIP)
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3 labels:
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4 - NeedDocs
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5 - Stage-Alpha
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6 ...
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7
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8 Introduction
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9 ============
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10
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11 This module attemtps to provide a storage driver that is really multiple
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12 storage drivers. This could be used for storage error tolerance or
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13 caching of data in a faster storage driver.
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14
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15 Configuration
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16 =============
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17
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18 An example:
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19
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20 ``` {.lua}
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21 storage = "multi"
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22 storage_multi_policy = "all"
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23 storage_multi = {
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24 "memory",
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25 "internal",
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26 "sql"
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27 }
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28 ```
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29
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30 Here data would be first read from or written to [mod\_storage\_memory],
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31 then internal storage, then SQL storage. For reads, the first successful
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32 read will be used. For writes, it depends on the `storage_multi_policy`
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33 option. If set to `"all"`, then all storage backends must report success
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34 for the write to be considered successful. Other options are `"one"` and
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35 `"majority"`.