Add command line switch to enable projections on startup

[jen20]

As @sbellware points out it would be useful to be able to enable projections on startup for unit testing without the need to invoke a script etc. Consider adding a command line such as (--enable-system-projections) that starts them in the enabled state.

[gregoryyoung]

I am slightly against this. For me I only see it ever being used in the
case of unit tests (there is no use for a production system to have this).

If doing unit tests you can also pretty easily enable projections

On Sat, Jun 6, 2015 at 3:38 AM, James Nugent notifications@github.com
wrote:

As @sbellware https://github.com/sbellware points out it would be
useful to be able to enable projections on startup for unit testing without
the need to invoke a script etc. Consider adding a command line such as (
--enable-system-projections) that starts them in the enabled state.

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#504.

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[sbellware]

Yes, it's specifically for a testing scenario where an ephemeral database is being used.

I didn't feel that it was easy, per se from the perspective of test automation, to enable projections on a newly started instance.

I wrote this script to do it: https://gist.github.com/sbellware/74a8090fc73c871c016b

So, now I have an automated way to do it, but the "easiness" really isn't something I see as akin to automation.

My startup script now does what I want it to do, and I suppose anyone else can copy that Gist code and use it if they want the same effect.

If that script proliferates, it might be an affirmation that it is a common way to start the server, and it would possibly be a voting in-favor of being able to do this without going to the HTTP control interface immediately after actuating the principle start-up control (the clusternode binary).

So, yes, it's for testing. And yes, it would be nice to not consider this mode a second class citizen of server startup because it's for testing. I would offer that what matters is what's common rather than what's production.

Anyway, in the mean time - and as long as the interface doesn't change - I've got what I think of as a workable workaround.

[gregoryyoung]

I understand totally however I would push towards lets write a blog post and provide copy/paste code or bring better documentation as opposed to adding a feature.

[pgermishuys]

Just putting this in here as a note.
There was a command line switch (--development-mode) added that would start the system projections here 918ca9f
The --development-mode has since also been split into 2 separate switches which are --start-standard-projections and --disable-http-caching

Also, +1 regarding the documentation around starting the projections.

[pgermishuys]

Closing this issue as projection documentation will cover this as this issue is directed at the command line switch.