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authorMatthew Hodgson <matthew@matrix.org>2014-11-11 20:49:03 +0200
committerMatthew Hodgson <matthew@matrix.org>2014-11-12 00:18:25 +0200
commit7e1779d48c5ef9a90b60a409286f9830c76eb8ae (patch)
tree670d58f435e8abcefe1fc7eb362307500be3ca3e
parenthaven't i already moved you to matrix-doc twice? :/ (diff)
downloadsynapse-7e1779d48c5ef9a90b60a409286f9830c76eb8ae.tar.xz
this is ancient and has been moved to matrix-doc/drafts/federated_versioning_design_notes.rst
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-Versioning is, like, hard for backfilling backwards because of the number of Home Servers involved.
-
-The way we solve this is by doing versioning as an acyclic directed graph of PDUs. For backfilling purposes, this is done on a per context basis. 
-When we send a PDU we include all PDUs that have been received for that context that hasn't been subsequently listed in a later PDU. The trivial case is a simple list of PDUs, e.g. A <- B <- C. However, if two servers send out a PDU at the same to, both B and C would point at A - a later PDU would then list both B and C.
-
-Problems with opaque version strings:
-    - How do you do clustering without mandating that a cluster can only have one transaction in flight to a given remote home server at a time. 
-      If you have multiple transactions sent at once, then you might drop one transaction, receive another with a version that is later than the dropped transaction and which point ARGH WE LOST A TRANSACTION.
-    - How do you do backfilling? A version string defines a point in a stream w.r.t. a single home server, not a point in the context.
-
-We only need to store the ends of the directed graph, we DO NOT need to do the whole one table of nodes and one of edges.