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From Jason Smith <>
Subject Re: how to debug a single PUT that is very slow?
Date Mon, 02 Apr 2012 07:02:11 GMT
Hi, Mark. Do you have a validate_doc_update function in any design
documents in that database?


On Mon, Apr 2, 2012 at 1:41 PM, Mark Hahn <> wrote:
> I'm having a problem in a particular situation where a specific put of a
> new document is taking 10 to 20 seconds.  The db is not very loaded down.
>  There are 5 to 25 writes/sec and about 200 reads per second.  I have a db
> watcher that is invoked on every change.
> Looking at the log timestamps, the PUT for the new document doesn't even
> register as an [info] line until ten seconds after my app sent the http
> request.  The log just shows normal read and writes during that 10 seconds.
>  No view is being rebuilt nor is there a compaction happening.
> I can repeat this any time I want by uploading 18 files from my browser,
> where each of the 18 triggers an invocation of imagemagick thumbnail
> conversion and then adding that thumbnail as an attachment to each of 18
> docs.  The attachments are only about 20 kbytes each.  The doc that is
> trying to be created is unrelated to any of those 18.  The problem just
> happens when I try to create the doc at the same time.
> The cpu is not loaded.  Node and the db are only consuming about 15% each
> of the cpu during the episode.
> Any idea what could cause this?  What can I do to track the problem down?

Iris Couch

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