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design for simulating clusters w/o simulating cluster gateways

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Joey Hess 2024-09-25 12:58:26 -04:00
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doc/todo/git-annex_proxies.mdwn
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@ -92,7 +92,38 @@ Planned schedule of work:
clusternode mycluster-foo foo
clusternode othercluster-foo foo
Implementation plan for this:
* clusternode initializes a new cluster node UUID, and adds to
simRepos.
* add `simClusterNodes :: M.Map UUID (UUID, RemoteName)`,
which maps from the cluster node UUID to the UUID of the underlying
repo, and its node name.
* clusternode also adds to simClusterNodes.
* setPresentKey checks if the UUID is in simClusterNodes.
* If it is, it makes the key present/missing in the underlying repo
UUID as well.
* And, it looks through simConnections to find any other repos that
also have a connection to the cluster node with that name.
Each of those repos also gets its simLocations updated.
But: The cluster node UUID would need to have the same preferred content
etc as the underlying repo. And, it would need to be in the same groups.
And it would be counted as another copy. Could use a cluster UUID to
avoid the numcopies count. But can adding a separate UUID be avoided?
Implementation plan for this without separate UUID:
* add `simClusterNodes :: M.Map RepoName UUID`,
* clusternode adds to simClusterNodes.
* checkKnownRemote needs to check simClusterNodes as well as
simRepos so that cluster nodes can be used as remotes.
* Plumb repo name through to setPresentKey.
* setPresentKey checks if repo name is in simClusterNodes.
* If it is, it looks through simConnections to find any other
repos that also have a connection to the cluster node with
that name. Each of those repos also gets its simLocations updated
for the change being logged.
* sim: Add support for metadata, so preferred content that matches on it
will work