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room directory is very very slow over federation as that API doesn't let you paginate #3327

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richvdh opened this issue Feb 27, 2017 · 14 comments
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room directory is very very slow over federation as that API doesn't let you paginate #3327

richvdh opened this issue Feb 27, 2017 · 14 comments
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A-Performance A-Room-Directory P1 S-Major Severely degrades major functionality or product features, with no satisfactory workaround T-Defect Z-Backend Z-Synapse

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@richvdh
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richvdh commented Feb 27, 2017

It takes at least 90 seconds to get a room list
@richvdh richvdh mentioned this issue Feb 27, 2017
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@ara4n ara4n added T-Defect S-Major Severely degrades major functionality or product features, with no satisfactory workaround P1 A-Room-Directory labels Feb 28, 2017
@ara4n
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ara4n commented Feb 28, 2017 •
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@erikjohnston are you seeing this performance prob?

@ara4n ara4n added S-Critical Prevents work, causes data loss and/or has no workaround and removed S-Major Severely degrades major functionality or product features, with no satisfactory workaround labels Feb 28, 2017
@richvdh
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richvdh commented Feb 28, 2017

(ftr, it has never been quick. I assume it pulls the entire room list from matrix.org before responding to the client)

@erikjohnston
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yes, it is quite slow

@ara4n
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ara4n commented Mar 9, 2017

...and it gets stuck issuing 50x's half the time :(

@ara4n ara4n mentioned this issue Mar 9, 2017
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@ara4n ara4n changed the title room directory is unusable over federation room directory is unusable (especially over federation) Mar 9, 2017
This was referenced Mar 9, 2017
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@ara4n
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ara4n commented Mar 10, 2017

I've split this into two synapse bugs: matrix-org/synapse#1980 (general perf problems) and matrix-org/synapse#1981 (client-reader gets entirely wedged).

@lampholder lampholder modified the milestone: Riot web next release Mar 20, 2017
@ara4n
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ara4n commented Mar 20, 2017

so @erikjohnston seems to have fixed the 'general perf problems' part of this, but the problem over federation still exists. Apparently this is because the publicRooms API simply doesn't paginate at all over federation.

@ara4n ara4n changed the title room directory is unusable (especially over federation) room directory is very very slow over federation as that API doesn't let you paginate Mar 20, 2017
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ara4n commented Mar 20, 2017

apparently it should be usable but slow over federation (i.e. it's as slow as if you weren't paginating).

@ara4n ara4n added S-Major Severely degrades major functionality or product features, with no satisfactory workaround A-Performance and removed S-Critical Prevents work, causes data loss and/or has no workaround X-Release-Blocker labels Mar 20, 2017
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ara4n commented Mar 20, 2017

reprioritising appropriately

@lampholder lampholder removed this from the Riot web next release milestone Mar 27, 2017
@ara4n ara4n mentioned this issue May 15, 2017
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@martindale
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Current status?

@ara4n
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ara4n commented Aug 1, 2017

still waiting for someone to make the directory api paginate over federation, sadly :(

@erikjohnston erikjohnston removed their assignment Oct 11, 2017
@ara4n
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ara4n commented Sep 12, 2018

This is going to get really bad with the advent of hosted homeservers.

@ara4n
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ara4n commented Sep 12, 2018

I'm also not sure whether the problem is really a question of pagination or caching problems. This might also improve if we ever land the matthew/stats branch, so that the public room directory can just be pulled straight out of a room_stats table rather than having to do more sophisticated shenanigans?

@martindale
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martindale commented Sep 13, 2018 via email •
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@turt2live
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Searching matrix.org now that the directory is paginated is pretty quick.

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@martindale @turt2live @ara4n @richvdh @lampholder @erikjohnston