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From "Eli Stevens (JIRA)" <j...@apache.org>
Subject [jira] [Created] (COUCHDB-1817) OS Process Error <0.21247.103> :: {os_process_error, {exit_status,0}}
Date Sat, 01 Jun 2013 02:08:19 GMT
Eli Stevens created COUCHDB-1817:
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             Summary: 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


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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