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From "Eli Stevens (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1817) Exceeding the couchjs stack size does not have a clear error message
Date Thu, 06 Jun 2013 18:09:20 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13677322#comment-13677322
] 

Eli Stevens commented on COUCHDB-1817:
--------------------------------------

Related: https://github.com/apache/couchdb/commit/501459c8b70efb814f5eef131201f7954781af1d

Per conversations in IRC, apparently if the logs for couchjs could be viewed, it would make
it apparent what's going on.
                
> Exceeding the couchjs stack size does not have a clear error message
> --------------------------------------------------------------------
>
>                 Key: COUCHDB-1817
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1817
>             Project: CouchDB
>          Issue Type: Bug
>          Components: JavaScript View Server
>            Reporter: Eli Stevens
>            Priority: Minor
>         Attachments: couchdb__couchdb_files.png, couchdb__httpd_status_codes.png, couchdb_mem.png,
loadavg.png, memory2.png
>
>
> Updated description:
> When a large document is uploaded and the couchjs process runs out of stack, the error
message that gets produced does not make it easy to debug what is going wrong.
> In our case we had some data that should have been an attachment but was ending up in
the document proper, which caused us to have 45MB documents, which triggered the issue.  Having
an error message that says which document ran the view server out of space, etc. would be
nice.
> ---
> Original description:
> We have started seeing errors crop up in our application that we have not seen before,
and we're at a loss for how to start debugging it.
> [~dch] Said that we might look into system resource limits, so we started collecting
all of the output from _stats into RRD (along with memory, load, etc. that we were already
collecting), but nothing is jumping out at us as obviously problematic.
> We can semi-reliably reproduce the problem, but it's far from a minimal test case (basically,
we load up several large chunks of data, and then halfway through the processing run, we get
the error).  The error doesn't seem to happen if we load up each chunk by itself.
> The DB in question has about 100 docs in it, none particularly large (nothing over a
couple KB would be my guess), with a couple hundred MB in attachments.  10ish design docs,
coffeescript.  In general, there isn't anything that seems obviously resource intensive.
> We have seen this issue on 1.2.0, 1.2.1, and we're working on getting a machine with
1.3.0 set up (the PPA we'd been using hasn't been updated yet).  Ubuntu 12.04, spinning disk,
etc.  The system is under load when it happens, but the load isn't more than 1.5x the number
of cores.  I don't have disk IO numbers at hand, but I'd be surprised if that was being strained.
> Error as it appears in couch.log: https://gist.github.com/wickedgrey/e7fd3fc14b6d43e95564
> The design doc in question: https://gist.github.com/wickedgrey/db41b0c3c75a590e2109
> An example document: https://gist.github.com/wickedgrey/a8422aab261ddd2ce4fe
> We have some preliminary evidence that the problem persists after the system goes quiet,
but we're not certain.
> Either CouchDB isn't handling things correctly, in which case this bug is "prz fix" or
we're doing something wrong (hitting a resource limit, or something), in which case this bug
is "prz make the error message more informative".
> Thanks!

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