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From "Isaac Z. Schlueter (JIRA)" <j...@apache.org>
Subject [jira] [Created] (COUCHDB-2037) view unavailability on production design docs
Date Sun, 26 Jan 2014 03:06:40 GMT
Isaac Z. Schlueter created COUCHDB-2037:
-------------------------------------------

             Summary: view unavailability on production design docs
                 Key: COUCHDB-2037
                 URL: https://issues.apache.org/jira/browse/COUCHDB-2037
             Project: CouchDB
          Issue Type: New Feature
          Components: JavaScript View Server
            Reporter: Isaac Z. Schlueter


It can take a very long time to generate views for a large database.  If you have an application
that relies on those views, even if performance is acceptable, it is generally a serious problem
if something causes the views for that design doc to no longer be available.  This gets especially
tricky if a new view is added or modified, as then all view data is thrown away and regenerated,
causing your website or app to be unavailable for hours at a time.

To work around this problem, I've taken to the following work flow:

1. PUT the new design doc to /db/_design/scratch
2. Load a view from /db/_design/scratch
3. Once view generation on _design/scratch finishes, send an http COPY request to move the
_design/scratch to _design/app.

This mostly works pretty well.  However, if you have jobs that copy couchdb documents from
one place to another, it can be very easy to accidentally trigger a view regeneration and
cause your website or app to go down.  (Qv today's npmjs.org outage.)

I would love it if there was a way to say, "NEVER make the views of _design/app unavailable,
even if they are temporarily out of date".  I can imagine a few ways that this could be accomplished:

1. PUTs to the specified design doc fail if they modify the "views" member.
2. COPYs to the specified design doc fail if the COPY source does not have a full set of pre-generated
views.
3. Views for the specified design doc are always done in the background, and stale=ok is assumed
for all requests.



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