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pages/matrix: attempt to explain DAG splits in addition to state resets

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apparently they are the same, but different,
while the same, and some communities I
participate in appear to be experiencing
them unintentionally in worse forms than
my Dendrite invisibility.
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Aminda Suomalainen 2022-09-29 23:31:42 +03:00
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@ -64,6 +64,21 @@ but regardless [still happens in all versions after that](https://github.com/mat
You shouldn't just trust me or the variable on this site on what is the latest version, [consult the Spec](https://spec.matrix.org/latest/rooms/#complete-list-of-room-versions) and add [Version Checker](matrix:u/version:maunium.net) or [Fluff Generator](matrix:u/+:jae.fi) or [their sibling](https://github.com/maubot/rsvc) to your room and once they join, `!servers upgrade {{site.matrixLatestRoomVersion}}` replacing the {{site.matrixLatestRoomVersion}} with your target version.
#### How about DAG splits?
DAG splits are a phenomenon somehow related to state resets above, but instead
of all servers accepting the same old state, they disagree and split to different
directions with varying severity.
In minor case some servers may decide that a user is not in the room and not
display messages from them, while in more severe situations the room may practically
be two different rooms with no new messages in common between different sides
kind of resembling [IRC's netsplits before sync.](https://en.wikipedia.org/wiki/Netsplit)
People understanding state resolution (which by the way don't include me)
disagree on the exact cause only agreeing that it's difficult to fix. From
what is told to me, I understand it to be tracked [in the same Synapse issue #8629](https://github.com/matrix-org/synapse/issues/8629).
### What are these idlekicks for inactivity, why are they for?
Some Matrix rooms decide to connect their channel to IRC maintaining the same users on both sides, which can be heavy for the IRC network depending on bridge type of which there are three "major" variants: