iilyak opened a new pull request #3933:
URL: https://github.com/apache/couchdb/pull/3933
## Overview
Recent refactor of `couch_index_server` made it a sharded implementation.
This means multiple processes are in play now. This made it somewhat harder to
bounce in production in case of problems. Also the
`couch_debug:print_linked_processes(couch_index_server)` had an assumption that
`couch_index_server` is a single process.
This PR does two very related things
1. fixes `couch_debug:print_linked_processes(couch_index_server)`
2. adds `couch_index_debug` module with auxiliary functions to restart
`couch_index_server` processes safely.
## Testing recommendations
1. compile, start, remsh
2. `couch_debug:print_linked_processes(couch_index_server).`
```
|name | reductions |
message_queue_len | memory |id
|--------------------------------------------------|------------|-------------------|--------------|--
|index_server_1[<0.320.0>] | 1127 | 0
| 17000 |
| couch_secondary_services[<0.312.0>] | 93596 | 0
| 68632 |
| couch_event_listener:do_init/3[<0.323.0>] | 203 | 0
| 2856 |
| index_server_1[<0.320.0>] | 1127 | 0
| 17000 |
| | |
| |
|index_server_2[<0.324.0>] | 290 | 0
| 6088 |
| couch_secondary_services[<0.312.0>] | 93598 | 0
| 68632 |
| couch_event_listener:do_init/3[<0.326.0>] | 169 | 0
| 2856 |
| index_server_2[<0.324.0>] | 290 | 0
| 6088 |
....
```
3. `couch_index_debug:help().`
```
[names,print_linked_processes,busy,restart_busy,restart]
```
4. `couch_index_debug:help(names)`
5. `couch_index_debug:help(print_linked_processes)`
6. `couch_index_debug:help(busy)`
7. `couch_index_debug:help(restart_busy)`
8. `couch_index_debug:help(restart)`
9. Note pid of `whereis(index_server_8).` and do
`couch_index_debug:restart(index_server_8)`
## Related Issues or Pull Requests
- https://github.com/apache/couchdb/pull/3860
## 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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