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Date: Wed, 18 Dec 2013 16:20:17 +0000
From: david martin <david.martin@lymegreen.co.uk>
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To: user@couchdb.apache.org
Subject: Timeout using Erlang views with large documents
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Futon on Apache CouchDB 1.2 (according to Futon)
{"couchdb":"Welcome","version":"1.2.0"} according to ?
CouchDB 1.4.0 Ubuntu according to Package name

I set os_process_timeout 50000000000000 (effective infinity).

  I ALWAYS get the VERY unhelpful message which merely prints the document contents.

Error: timeout       % yes I know this but cannot do anything about it

{gen_server,call,     % it's in a gen_server yes I know this!
             [<0.14190.8>,   % this is its PID yes I know this!
              {prompt,[<<"map_doc">>,   % it is a MAP function yes I know this!
{[{<<"_id">>,<<"61c3f496b9e4c8dc29b95270d9000370">>}, % it is the document I am processing, Yes I know this!
{<<"_rev">>,<<"9-e48194151642345e0e3a4a5edfee56e4">>},
                         .....

Yes it is a large and complex document (16K lines to make this happen on fast machine much less on Raspberry Pi).
Yes it uses Erlang view function.
Yes I DO want it to hog resources until it is finished.
Yes I am the administrator.
No  I AM NOT INTERFERING WITH ANYTHING ELSE.
No I cannot dictate how big or small the document is.
Yes this is important to me.
I have not pursued this as I was using rcouch, I could not find the source of the timeout message.
I did not want to have to rebuild to fix this.
I did not want to bother the Couchdb team as I was using a fork of CouchDB.
Simlar issues have been raised and no answers forthcoming.
Mentions of "hidden tweaks", "this is not good for you", "have you got big documents"  etc.

How do I get this NOT to timeout?

On rcouch I would change a value and rebuild a release to fix this (if I could identify the source).
If anybody can give a clue I will test their hypothesis and report back to the list.

-- 
David Martin