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From "Alexander Shorin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (COUCHDB-1429) Server stops responding after heavy load against _list function
Date Mon, 01 Jul 2013 23:37:20 GMT

     [ https://issues.apache.org/jira/browse/COUCHDB-1429?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alexander Shorin updated COUCHDB-1429:
--------------------------------------

    Component/s: View Server Support
    
> Server stops responding after heavy load against _list function
> ---------------------------------------------------------------
>
>                 Key: COUCHDB-1429
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1429
>             Project: CouchDB
>          Issue Type: Bug
>          Components: View Server Support
>    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-5j59pR6ummdWpMthhuuA@mail.gmail.com%3e

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