wohali commented on issue #745: Replication with attachments never completes,
{mp_parser_died,noproc} error
URL: https://github.com/apache/couchdb/issues/745#issuecomment-351301113
Hey @nickva I spent time today on getting a repro for this, as it's
affecting more and more people. Bear with me on the setup, it's a little
involved.
Set up a VM with the following parameters (I used VMWare Workstation):
- 20GB HDD, 512 MB RAM (!), 1 CPU
- Debian 8.latest (or 9, I tested on 8), 64-bit
- CouchDB master - have it running on `localhost:5984` with `admin:password`
as the creds, `n=1`, and logging at `debug` level
- `sudo apt-get install stress python3 python3-virtualenv virtualenv`
- `mkdir 745 && cd 745 && virtualenv -p python3 venv && source
venv/bin/activate`
- `pip install RandomWords RandomIO requests docopt schema`
- `wget
https://gist.github.com/wohali/1cd19b78c0a417dbeb9f66b3229f7b58/raw/6539d48fa9e05b021f344b80fbf0d7c3e7fcd6e4/makeit.py`
Now you're ready to setup the test:
```
$ curl -X PUT http://admin:password@localhost:5984/foo
$ python makeit.py ./makeit.py 10
# repeat above a few times - get the DB to 1GB or larger. You can increase
10 but at some point you'll run out of RAM, so be careful.
```
Now to run the test:
* In one window: `tail -f | grep` your couch log for `mp_parser`.
* In another window, stress the machine's CPU and network: `stress --timeout
90m --cpu 1 --io 4`. (You can add disk access to this with `-d 8` if desired.
* In the window running the Python `virtualenv`, start the replication:
`curl http://admin:password@localhost:5984/_replicate -H "Content-Type:
application/json" --data '{"create_target: true, "source": "foo", "target":
"bar"}'`
If the above succeeds, `curl -X DELETE
http://admin:password@localhost:5985/bar` and try to replicate again.
This produces a failure for me within 10 minutes. The command line returns:
```
{"error":"error","reason":"{worker_died,<0.26846.9>,{process_died,<0.27187.9>,kaboom}}"}
```
and the logfile has errors identical to that in the original post above, and
in #574.
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