view mod_storage_appendmap/README.markdown @ 2617:7c3a1688e385

Purge the roster from RAM when the user logs off. Also.. the `download` flag was being checked for, but never set, causing the roster to be fetched even if it was cached.
author JC Brand <jc@opkode.com>
date Tue, 14 Mar 2017 12:35:56 +0000
parents b84284144e21
children 88474dd1af48
line wrap: on
line source

---
labels:
- 'Stage-Alpha'
- 'Type-Storage'
summary: Experimental map store optimized for small incremental changes
...

This is an experimental storage driver where changed data is appended.
Data is simply written as `key = value` pairs to the end of the file.
This allows changes to individual keys to be written without needing to
write out the entire object again, but reads would grow gradually larger
as it still needs to read old overwritten keys. This may be suitable for
eg rosters where individual contacts are changed at a time. In theory,
this could also allow rolling back changes.

Requires 0.10