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  • Experiment with patterns for concurrent long running queries · 5 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions issue performed_via_github_app
392601114 https://github.com/simonw/datasette/issues/38#issuecomment-392601114 https://api.github.com/repos/simonw/datasette/issues/38 MDEyOklzc3VlQ29tbWVudDM5MjYwMTExNA== simonw 9599 2018-05-28T20:47:31Z 2018-05-28T20:47:31Z OWNER

I think the way Datasette executes SQL queries in a thread pool introduced in #45 is a good solution for this ticket.

 
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 Experiment with patterns for concurrent long running queries 268462768  
339389328 https://github.com/simonw/datasette/issues/38#issuecomment-339389328 https://api.github.com/repos/simonw/datasette/issues/38 MDEyOklzc3VlQ29tbWVudDMzOTM4OTMyOA== simonw 9599 2017-10-25T16:29:23Z 2017-10-25T16:29:23Z OWNER

Ideally we can get some serious gains from the fact that our database file is opened with the immutable option.

 
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 Experiment with patterns for concurrent long running queries 268462768  
339389105 https://github.com/simonw/datasette/issues/38#issuecomment-339389105 https://api.github.com/repos/simonw/datasette/issues/38 MDEyOklzc3VlQ29tbWVudDMzOTM4OTEwNQ== simonw 9599 2017-10-25T16:28:39Z 2017-10-25T16:28:39Z OWNER

The gold standard here is to be able to serve up increasingly large datasets without blocking the event loop and while using a sustainable amount of RAM

 
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 Experiment with patterns for concurrent long running queries 268462768  
339388771 https://github.com/simonw/datasette/issues/38#issuecomment-339388771 https://api.github.com/repos/simonw/datasette/issues/38 MDEyOklzc3VlQ29tbWVudDMzOTM4ODc3MQ== simonw 9599 2017-10-25T16:27:29Z 2017-10-25T16:27:29Z OWNER

If this does work, I need to figure it what to do about the HTML view. ASsuming I can iteratively produce JSON and CSV, what to do about HTML? One option: render the first 500 rows as HTML, then hand off to an infinite scroll experience that iteratively loads more rows as JSON.

 
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 Experiment with patterns for concurrent long running queries 268462768  
339388215 https://github.com/simonw/datasette/issues/38#issuecomment-339388215 https://api.github.com/repos/simonw/datasette/issues/38 MDEyOklzc3VlQ29tbWVudDMzOTM4ODIxNQ== simonw 9599 2017-10-25T16:25:45Z 2017-10-25T16:25:45Z OWNER

First experiment: hook up an iterative CSV dump (just because that’s a tiny bit easier to get started with than iterative a JSON). Have it execute a big select statement and then iterate through the result set 100 rows at a time using sqite fetchmany() - also have it async sleep for a second in between each batch of 100.

Can this work without needing python threads? 

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 Experiment with patterns for concurrent long running queries 268462768  

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