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Mention hotel california

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Erik Johnston 2018-08-03 12:18:41 +01:00
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proposals/1442-state-resolution.md
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@ -168,6 +168,14 @@ also taken into account. This case can be handled if we also consider the
difference in auth chains between the two sets, which in the previous example
would include B.
(This is also the root cause of the "Hotel California" issue, where left users
get spontaneously rejoined to rooms. This happens when a user has a sequence of
memberships changes of the form: leave (A), join (B) and then another leave (C).
In the current algorithm a resoluton of A and C would pick A, and a resolution
of A and B would then pick B, i.e. the join. This means that a suitably forked
graph can reset the state to B. This is fixed if when resolving A and C we also
consider B, since its in the auth chain of C.)
## Power Level Ordering