[feedhenry-dev] [Feature request] Allow to create project with mongo database that is already migrated.

John Frizelle jfrizell at redhat.com
Mon Nov 21 16:39:50 UTC 2016

I added some comments to the trello ticket - copying them here for

The problem with this approach (and the reason we have historically used
shared DB) is that a new empty DB in MongoDB 2.x requires ~300MB of disk
space - that's a HUGE overhead for every single app created (especially
considering that a large % of apps created are hello world style apps that
do not require dedicated DB). In MongoDB 3.x, there is pretty much a 0
overhead on creating a new DB - i.e. it does not pre-allocate 100's of MB
of disk space. So, I think we either need to wait until we have 3.X MongoDB
or be able to indicate in the project/app/service template if it requires a
dedicated DB and only create the dedicated DB for those templates that need

John Frizelle
Platform Architect, Red Hat Mobile
Consulting Engineering

mobile: *+353 87 290 1644 <//+353872901644>*
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skype: *john_frizelle*
mail: *jfrizell at redhat.com <jfrizell at redhat.com>*

On 21 November 2016 at 16:22, Wojciech Trocki <wtrocki at redhat.com> wrote:

> *TL;DR - New cloud apps and services should use direct mongo db access.
> Migration should be used only for legacy projects.*
> We require database migrations for the new apps mostly because of
> historical reasons. We should enable creation of service and cloud app with
> direct access to the mongo database. Creating ditch type database doesn't
> make any sense at the moment because in most of the guides and services we
> require database to be migrated straightaway.
> That's would improve our guides and would mean way less hassle for
> customers. Conor mentioned this numerous times in some of high level
> requirements documents. This functionality was also confirmed to be really
> useful for consulting. Sometimes developers forgot to migrate database and
> fh-ditch is used in production which is causing some performance and access
> problems and involve painful database migration.
> This feature may be also mentioned in various tickets and different
> contexts.
> Purpose of this emails is to determine some blockers (do we still have to
> use ditch by default) and provide some general actions.
> Regards
> --
> Wojciech Trocki
> Software Engineer, Red Hat Mobile
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> feedhenry-dev at redhat.com
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