kocolosk opened a new pull request #3337:
URL: https://github.com/apache/couchdb/pull/3337
## Overview
This patch introduces an escript that generates an Erlang .boot script to
start CouchDB using the in-place .beam files produced by the compile phase of
the build. This allows us to radically simplify the boot process for dev nodes
as Erlang computes the optimal order for loading the necessary modules, and the
previous logic in `boot_node` was, well, _not_ optimal 😄
In addition to the simplification this approach offers a nice startup time
speedup, at least when working inside a container environment. In my test with
the stock .devcontainer it reduces startup time from about 75 seconds down to
under 5 seconds 🚀
I had initially introduced a new `devnode` target in the Makefile but
figured just invoking the script if the `devnode.boot` file is missing would be
sufficient. Note that this file can become outdated on the following conditions:
- Change in Erlang version
- A new application is introduced to the source tree
- Modules are removed from existing applications
In each case running `make clean` or simply deleting the `devnode.boot` file
will fix it. We could generate it every time but I figured it was maybe
overkill for infrequent occurrences, and `make clean` is an easy fix.
## Testing recommendations
Start a dev node with `./dev/run`. Try doing this after a `make clean; make`
cycle and you should see a ~5 second delay during "Ensure Erlang boot script
exists". Subsequent runs should be instantaneous at that step.
## Related Issues or Pull Requests
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repositories please put links to those issues or pull requests here.
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## Checklist
- [x] Code is written and works correctly
- [ ] Changes are covered by tests
- [ ] Any new configurable parameters are documented in
`rel/overlay/etc/default.ini`
- [ ] A PR for documentation changes has been made in
https://github.com/apache/couchdb-documentation
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