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Improve how node roles are assigned in Garage

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- change the terminology: the network configuration becomes the role
  table, the configuration of a nodes becomes a node's role
- the modification of the role table takes place in two steps: first,
  changes are staged in a CRDT data structure. Then, once the user is
  happy with the changes, they can commit them all at once (or revert
  them).
- update documentation
- fix tests
- implement smarter partition assignation algorithm

This patch breaks the format of the network configuration: when
migrating, the cluster will be in a state where no roles are assigned.
All roles must be re-assigned and commited at once. This migration
should not pose an issue.
This commit is contained in:
Alex Auvolat
2021-11-09 12:24:04 +01:00
parent 53888995bd
commit c94406f428
42 changed files with 1430 additions and 557 deletions
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doc/book/src/working_documents/load_balancing.md
+2
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@@ -1,5 +1,7 @@
# Load Balancing Data (planned for version 0.2)
**This is being yet improved in release 0.5. The working document has not been updated yet, it still only applies to Garage 0.2 through 0.4.**
I have conducted a quick study of different methods to load-balance data over different Garage nodes using consistent hashing.
## Requirements