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Updated Filer Store Replication (markdown)

Chris Lu 2020-09-14 01:14:19 -07:00
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Filer-Store-Replication.md

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# Goal
Here we talk about using `weed filer -peers=...`. It actually achieves two purposes:
1. Aggregate filer meta data changes from peers
2. Replay filer meta data changes to local filer store
* Synchronize the meta data in the filer stores.
* Active-Active or one-directional replication.
# FUSE mount with multiple filers
The first point is tightly related to FUSE Mount, which streams filer meta data changes from one filer.
So when using multiple filers, this `-peers=xxx` option is needed. If not, a FUSE mount can only see the changes applied to the connected filer. This is required whether the filers are using shared or dedicated filer stores.
```
FUSE mount <----> filer1 -- filer2
\ /
\ /
filer3
```
# File Store Replication
The second point is about metadata replication.
This `-peers=xxx` can synchronize the meta data in the filer stores. If filers are using shared filer stores, this is optional.
It can also enables Active-Active or one-directional replication.
# Use Cases