But now Lemmy has you and Phiresky looking over the database and optimizing things so things like this should be found a lot quicker. I think you probably underestimate your value and the gratitude people feel for your insight and input.
Every time you perform an action like commenting, you expect it to maybe update a few things. The post will increase the number of comments so it updates that, your comment is added to the list so those links are created, your comment is written to the database itself, etc. Each action has a cost, let’s say it costs a dollar every update. Then each comment would cost $3, $1 for each action.
What if instead of doing 3 things each time you posted a comment, it did 1300 things. And it did the same for everyone else posting a comment. Each comment now costs $1300. You would run out of cash pretty quickly unless you were a billionaire. Using computing power is like spending cash, and lemmy.world are not billionaires.
I don’t know that it’s a DB design flaw if we’re talking about federation messages to other instances inboxes (which created rows of that magnitude for updates does sound like federation messages outbound to me). Those need to be added somewhere. On kbin, if installed using the instructions as-is, we’re using rabbitmq (but there is an option to write to db). But failures do end up hitting sql still and rabbit is still storing this on the drive. So unless you have a dedicated separate rabbitmq server it makes little difference in terms of hits to storage.
It’s hard to avoid storing them somewhere, you need to be able to know when they’ve been sent or if there are temporary errors store them until they can be sent. There needs to be a way to recover from a crash/reboot/restart of services and handle other instances being offline for a short time.
EDIT: Just read the issue (it’s linked a few comments down) it actually looks like a weird pgsql reaction to a trigger. Not based on the number of connected instances like I thought.
Yep I read through it in the end. Looks like they were applying changes to all rows in a table instead of just one on a trigger. The first part of my comment was based on reading comments here. I’d not seen the link to the issue at that stage. Hence the edit I made.
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This is what happens when people don’t understand federation.
Yep. Sitting on Lemmy.today browsing Lemmy.world posts right now…so I don’t know. Really advice people to not have just one account. :)
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No. Care to explain please?
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You’ve become fixated on this issue but if you look at the original bug, phiresky says it’s fixed in 0.18.3
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But now Lemmy has you and Phiresky looking over the database and optimizing things so things like this should be found a lot quicker. I think you probably underestimate your value and the gratitude people feel for your insight and input.
In layman’s terms please?
Every time you perform an action like commenting, you expect it to maybe update a few things. The post will increase the number of comments so it updates that, your comment is added to the list so those links are created, your comment is written to the database itself, etc. Each action has a cost, let’s say it costs a dollar every update. Then each comment would cost $3, $1 for each action.
What if instead of doing 3 things each time you posted a comment, it did 1300 things. And it did the same for everyone else posting a comment. Each comment now costs $1300. You would run out of cash pretty quickly unless you were a billionaire. Using computing power is like spending cash, and lemmy.world are not billionaires.
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Brutal. This is why I don’t go near databases unless I have to.
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I don’t know that it’s a DB design flaw if we’re talking about federation messages to other instances inboxes (which created rows of that magnitude for updates does sound like federation messages outbound to me). Those need to be added somewhere. On kbin, if installed using the instructions as-is, we’re using rabbitmq (but there is an option to write to db). But failures do end up hitting sql still and rabbit is still storing this on the drive. So unless you have a dedicated separate rabbitmq server it makes little difference in terms of hits to storage.
It’s hard to avoid storing them somewhere, you need to be able to know when they’ve been sent or if there are temporary errors store them until they can be sent. There needs to be a way to recover from a crash/reboot/restart of services and handle other instances being offline for a short time.
EDIT: Just read the issue (it’s linked a few comments down) it actually looks like a weird pgsql reaction to a trigger. Not based on the number of connected instances like I thought.
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Yep I read through it in the end. Looks like they were applying changes to all rows in a table instead of just one on a trigger. The first part of my comment was based on reading comments here. I’d not seen the link to the issue at that stage. Hence the edit I made.
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