kocolosk commented on issue #3603:
URL: https://github.com/apache/couchdb/issues/3603#issuecomment-906754022
Intriguing! I think I figured it out. The difference is that the `couchdb:3`
container is configured without any node name and is not running in distributed
mode. In that mode trying to monitor the remote Clouseau process triggers a
badarg error:
```
# /opt/couchdb/erts-9.3.3.14/bin/erl -boot
/opt/couchdb/releases/3.1.1/start_clean
Erlang/OTP 20 [erts-9.3.3.14] [source] [64-bit] [smp:8:8] [ds:8:8:10]
[async-threads:10] [hipe] [kernel-poll:false]
Eshell V9.3.3.14 (abort with ^G)
1> erlang:monitor(process, {main, '[email protected]'}).
** exception error: bad argument
in function monitor/2
called as monitor(process,{main,'[email protected]'})
```
whereas in dev mode we are running a CouchDB Erlang node and the behavior
changes to deliver a 'DOWN` message to the mailbox:
```
# /opt/couchdb/erts-9.3.3.14/bin/erl -boot
/opt/couchdb/releases/3.1.1/start_clean -name [email protected]
Erlang/OTP 20 [erts-9.3.3.14] [source] [64-bit] [smp:8:8] [ds:8:8:10]
[async-threads:10] [hipe] [kernel-poll:false]
Eshell V9.3.3.14 (abort with ^G)
([email protected])1> erlang:monitor(process, {main, '[email protected]'}).
#Ref<0.2127152124.2865758209.248364>
([email protected])2> receive M -> M end.
{'DOWN',#Ref<0.2127152124.2865758209.248364>,process,
{main,'[email protected]'},
noconnection}
([email protected])3>
```
Not sure offhand what the right fix is here. Seems like we ought to be able
to run gracefully without the Erlang distribution, although it's news to me
that the Docker image is configured that way.
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