Server stops responding after heavy load against _list function
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Key: COUCHDB-1429
URL: https://issues.apache.org/jira/browse/COUCHDB-1429
Project: CouchDB
Issue Type: Bug
Affects Versions: 1.1.1
Environment: Ubuntu 11.10 on AWS EC2 t1.micro instance, ~512MB memory
and no swap
Reporter: Nathan Vander Wilt
Under heavy load, CouchDB crashes and stops responding to all incoming requests.
To reproduce this, basically:
1. build-couchdb (1.1.1) on an EC2 t1.micro running Ubuntu
2. Add the '42' file at the path Blitz.io is looking for (not sure the easiest
way to do this natively, I inserted a rule for it at the nginx level)
3. Run their default rush on a _list function (mine happened to do a fair
amount of work,
doing a Markdown conversion and Mustache templating)
4. Around about the 40 concurrent user mark in my case, CouchDB dies a terrible
horrible death with a
bunch of zombie couchjs process.
In this log https://gist.github.com/a059c4db5bce19f1df7f (warning: large!)
you'll see the heavy requests being handled but suddenly crashing. The
"restart" seen at the end was due to manual intervention from the shell,
CouchDB did not gracefully handle the issue.
I later tried turning on some swap space in case memory was an issue, but
didn't seem to have an appreciable effect.
May be related to the discussion here:
http://mail-archives.apache.org/mod_mbox/couchdb-dev/201203.mbox/%3ccapino9ek5xajllpyufwnrk3hxkn5e-5j59pr6ummdwpmthh...@mail.gmail.com%3e
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