Yarn install deploy step takes over 9 minutes on staging!

[sandbergja]

Excerpt from my cap staging deploy today:

00:21 yarn:install
      01 yarn install --silent --no-progress
      01 warning "lux-design-system > [email protected]" has unmet …
      01 warning " > [email protected]" has unmet peer dependency "css-loader@…
      01 warning " > [email protected]" has unmet peer dependency "webpack@^3.…
      01 warning " > [email protected]" has unmet peer dependency "@bab…
      01 warning " > [email protected]" has unmet peer dependency "webpack@>=…
      01 warning "lux-design-system > [email protected]" has unmet …
      01 warning " > [email protected]" has unmet peer dependency "css-loader@…
      01 warning " > [email protected]" has unmet peer dependency "webpack@^3.…
      01 warning " > [email protected]" has unmet peer dependency "@bab…
      01 warning " > [email protected]" has unmet peer dependency "webpack@>=…
    ✔ 01 deploy@lib-approvals-staging2 545.325s
    ✔ 01 deploy@lib-approvals-staging1 549.197s
09:31 deploy:assets:precompile

Note that this step took over 9 minutes on both staging boxes. I re-ran this deploy, just to make sure it wasn't a fluke. It wasn't. The second deploy took 8.5 minutes on the yarn:install step.

Prod deploys in a reasonable amount of time.

Success criteria

• Deploying to staging is reasonably fast

Implementation notes

See this information from @carolyncole.

[christinach]

Related issue #930

[sandbergja]

On lib-approvals-staging2, yarn quickly installs all the dependencies. However, after all directories are present in node_modules, it spends several minutes maxing out the CPU.

[sandbergja]

Prod could be fast because yarn install is a disk-heavy operation, and prod is on the nice new HPE Alletra storage.

[sandbergja]

Interestingly, npm i is much faster on these boxes: 2 minutes without a package-lock.json, 35 seconds with one. This is compared to 4 minutes for yarn install with a yarn.lock and with plenty of packages already available in /home/deploy/.cache.

[christinach]

@sandbergja will replace yarn with npm.

[sandbergja]

It seems that rails requires yarn to a very high extent, and I couldn't find a way to precompile assets without invoking yarn. It seems that yarn is a bit less required in Rails 7, but we're not there yet.