rnewson opened a new pull request, #5628:
URL: https://github.com/apache/couchdb/pull/5628
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## Overview
Upgrades Nouveau to Lucene 10.
Existing indexes can still be queried and updated. New indexes will be built
with Lucene 10 (couchdb will auto-inject the version information into the
design document).
A couch_scanner plugin will build Lucene 10 versions of all current indexes
(sequentially) and update the design document on successful completion, making
the upgrade automatic.
TODO:
1) Needs additional tests
2) documentation on enabling the scanner plugin.
3) couch_scanner not currently happy with long-running ddoc/3 callback
functions (it blocks for the index to build, which could be a long time).
Possible remedies for 3 could be making nouveau_index_upgrader a gen_server
and just doing the all_docs scan ourselves. Will discuss with Nick this week.
Noting also that couch_scanner does not use from_json_obj and thus did not
set #doc.revs. I've added that here but is perhaps a sign that couch_scanner
should be read-only.
## Testing recommendations
TBD
## Related Issues or Pull Requests
N/A
## 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`
- [ ] Documentation changes were made in the `src/docs` folder
- [ ] Documentation changes were backported (separated PR) to affected
branches
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