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From "Geordan Rosario (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (COUCHDB-1817) OS Process Error <0.21247.103> :: {os_process_error, {exit_status,0}}
Date Tue, 04 Jun 2013 22:23:20 GMT

     [ https://issues.apache.org/jira/browse/COUCHDB-1817?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Geordan Rosario updated COUCHDB-1817:
-------------------------------------

    Attachment: memory2.png
                loadavg.png
                couchdb_mem.png
                couchdb__httpd_status_codes.png
                couchdb__couchdb_files.png

Different error message, but provoked the exact same way:

[<0.24793.5>] OS Process Error <0.17774.0> :: {os_process_error, "OS process timed
out."}

Errors that accompanied these graphs:
https://gist.github.com/wickedgrey/acb9a64481e67a25ecf2
                
> OS Process Error <0.21247.103> :: {os_process_error, {exit_status,0}}
> ---------------------------------------------------------------------
>
>                 Key: COUCHDB-1817
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1817
>             Project: CouchDB
>          Issue Type: Bug
>          Components: JavaScript View Server
>            Reporter: Eli Stevens
>         Attachments: couchdb__couchdb_files.png, couchdb__httpd_status_codes.png, couchdb_mem.png,
loadavg.png, memory2.png
>
>
> 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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