Activate share_pos on the room-list sliding sync instance #4035
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MatMaul
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Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #4035 +/- ##
=======================================
Coverage 84.50% 84.50%
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Files 266 266
Lines 28475 28476 +1
=======================================
+ Hits 24062 24063 +1
Misses 4413 4413 ☔ View full report in Codecov by Sentry. |
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Ahhh crypto dragons has been triggered :/ . Time to set up complement-crypto :) |
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Hum |
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The failed test was a timeout so I think it's a false alarm. |
bnjbvr
requested changes
Sep 30, 2024
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It failed again, it may not be a flake especially since it's restart related ? |
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The log files show: ..which imply that |
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A successful local run shows: |
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Right, found the cause. When it starts up, 2 sliding sync connections are made: This causes 2x HTTP requests to /sync. On passing tests, both finish quickly. On failing tests, one does not return at all for the duration of the test. Looking at the MITM dump for the failed run and it's clear that the one that doesn't return is {
"conn_id": "room-list",
"extensions": {
"account_data": {
"enabled": true
},
"receipts": {
"enabled": true,
"rooms": [
"*"
]
},
"typing": {
"enabled": true
}
},
"lists": {
"all_rooms": {
"filters": {
"not_room_types": [
"m.space"
]
},
"include_heroes": true,
"ranges": [
[
0,
0
]
],
"required_state": [
[
"m.room.encryption",
""
],
[
"m.room.member",
"$LAZY"
],
[
"m.room.member",
"$ME"
],
[
"m.room.name",
""
],
[
"m.room.canonical_alias",
""
],
[
"m.room.power_levels",
""
]
],
"timeline_limit": 1
}
},
"txn_id": "86a22ed3a03948dc985c7c32be1b5327"
}I suspect the sync code assumes that room-list requests return immediately on startup (which has been true up until now). By sharing the So this is a real bug unfortunately. The reason why it is flakey is likely due to the slow speed of GHA boxes. I suspect the test itself runs much more slowly, giving enough time for the new data to come down before the restart, meaning when it starts up again there is no new data to fetch, hence it blocks waiting for more data. The end-user impact of this will presumably be a spinner showing for 30s (as it's also waiting on the same listener the tests are) upon restart. You likely didn't see this because your account is way more active, meaning there is a high chance something will come down before the timeout, but in a test scenario this is not the case. |
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@kegsay thanks a lot for the detailed investigation 🙏 The fix should be easy-ish with all those infos, I'll have a look tomorrow. |
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The fix fwiw is to just use ?timeout=0 on the first sync (before the room list state is loaded). This matches sync V2 behaviour in other clients. |
I don't think it will be useful: syncv2 spec is saying that no timeout specified is the same as timeout=0. Synapse code seems to agree, for both syncv2 and SSS. |
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Nevermind, timeout of the first req is 60s in your logs. |
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Fixes #3936.
Signed-off-by: Mathieu Velten [email protected]