node.js - Deployment race condition causing CDN to cache old or broken files -


our current deploy process goes this:

  1. use grunt create production assets.

  2. create datestamp , point files @ our cdn (eg /scripts/20140324142354/app.min.js).

    sidenote: i've heard process called "versioning" before i'm not sure if it's proper term.

  3. commit build github.

  4. run git pull on web servers retrieve new code github.

this node.js site , using forever -w watch file changes , update site accordingly.

we have route setup in our app serve latest version of app via /scripts/*/app.min.js.

the reason version because our cdn set cache javascript files indefinitely , purposely creates cache miss code updated on cdn (and in our users' browsers).

this works fine most of time. breaks down if 1 of servers lags bit in checking out new code.

sometimes client hits page while deploy in progress , tries retrieve new javascript code cdn. cdn tries retrieve hits server isn't finished checking out new code yet , caches old or partially downloaded file causing sorts of problems.

this problem exacerbated fact our cdn has many edge locations , problem isn't visible our office. edge locations may have pulled down old/bad code while others may have pulled down new/good code.

is there better way these deployments avoid issue?

step 4 in procedure should be:

git archive --remote $yourgithubrepo --prefix=$timestamp/ | tar -xf - stop-server ln -sf $timestamp current start-server

your server use current directory (well, symlink) @ times. no matter how long deploy takes, application in consistent state.


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