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sgrif's profile
Miss Dada 🏳️‍⚧️
Miss Dada 🏳️‍⚧️
Miss Dada  🏳️‍⚧️
@sgrif

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Miss Dada  🏳️‍⚧️

@sgrif

Co lead of the http://crates.io  team. Creator of @dieselframework. Former host of @_bikeshed and @_yakshave. Former Rails comitter. Enby. they/them

Albuquerque, NM
patreon.com/seantheprogram…
Joined November 2008

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    1. Miss Dada  🏳️‍⚧️‏ @sgrif Feb 19
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      Back on my "essays as commit messages" shithttps://github.com/rust-lang/crates.io/pull/2203 …

      3 replies 0 retweets 18 likes
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    2. kornel@mastodon.social‏ @kornelski Feb 19
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      Replying to @sgrif

      For http://lib.rs  I had to give up on using a database for downloads. Now I use an in-memory equivalent of HashMap<version_id, Gzip<[u32; 366]>> for processing the download counts.

      1 reply 0 retweets 0 likes
    3. Miss Dada  🏳️‍⚧️‏ @sgrif Feb 19
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      Replying to @kornelski

      We're scaled across multiple servers, so no in memory

      2 replies 0 retweets 0 likes
    4. Miss Dada  🏳️‍⚧️‏ @sgrif Feb 19
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      Replying to @sgrif @kornelski

      What do download counts even mean for http://lib.rs ? I didn't think you served crates directly?

      2 replies 0 retweets 0 likes
    5. Justin Geibel  🏳️‍🌈‏ @jtgeibel Feb 19
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      Replying to @sgrif @kornelski

      Based on the 366, I'm guessing it's an in memory cache of 1 year of (upstream) daily download counts. As you said, since we have multiple servers updating the counts we can't cache much in process (plus Heroku can terminate us before we can write data out).

      1 reply 0 retweets 0 likes
    6. kornel@mastodon.social‏ @kornelski Feb 20
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      Replying to @jtgeibel @sgrif

      That's tough. But maybe you could use a more compact format in the db? Daily (version_id, date) adds ~200K identical dates every day. It could be (version_id, week_number) with a downloads[7] column, for example.

      1 reply 0 retweets 0 likes
    7. Miss Dada  🏳️‍⚧️‏ @sgrif Feb 20
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      Replying to @kornelski @jtgeibel

      If we had a problem we were trying to solve, sure. But all our time sensitive queries are on version id and date, the current structure is perfect for that

      1 reply 0 retweets 0 likes
    8. kornel@mastodon.social‏ @kornelski Feb 20
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      Replying to @sgrif @jtgeibel

      I've meant that as a way to reduce data size, given that the sheer volume of the data is causing you pains. Normalized table has 4-byte counters with ~50 bytes of overhead each. Merging them to be one row per version per week (or longer) should considerably reduce table size.

      1 reply 0 retweets 0 likes
    9. Miss Dada  🏳️‍⚧️‏ @sgrif Feb 20
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      Replying to @kornelski @jtgeibel

      The volume of data isn't, so much as how it's being accessed/laid out. Compressing rows would only delay the problem, and would likely slow down access patterns that are actually important to be fast. Only painful place right now is background jobs

      1 reply 0 retweets 0 likes
      Miss Dada  🏳️‍⚧️‏ @sgrif Feb 20
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      Replying to @sgrif @kornelski @jtgeibel

      The tuple overhead here wouldn't really be reduced. Every write produces a new tuple no matter what. The number of writes are the same. Duplicate date also isn't really reduced here since the overhead of an array element is the same as a date.

      8:32 AM - 20 Feb 2020
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      • kornel@mastodon.social
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