How to implement downtime for my Java app

[Arvind Rao]

Hello there

I have a Java-based app hosted on GAE. I want to schedule daily downtime for my app to clean up the datastore. 

a) Is there any way I can bring down the app (i.e. stop serving requests from users and cron jobs), so that I can do a manual clean up using the Datastore Viewer or Admin? Right now if I disable the app, I'm not allowed to - "Sorry, that operation is not allowed while the application is disabled.".

b) If (a) is not possible, is there is any way I can temporarily disable just the scheduled cron jobs? They fire every minute and update the datastore, so if I can disable them that might be sufficient time for me to do a quick manual cleanup.

Apologies if I missed this in the documentation or somewhere online, but so far I couldn';t find any answers on the web.

Thanks

Arvind

[Timofey Koolin]

I see 2 ways:

1. create "empty" version for your application with return "OK" (or other text) for any request and do not do any else. For dowtime you will make "empty" as default version, than return your usual version.

2. Make any property such as "downtime" in memcache & db and check it for every request and if it is true - do nothing.

2011/10/13 Arvind Rao <arvind...@gmail.com>

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[Christopher]

You should be able to create a Filter (extend javax.servlet.Filter)
which you then add to the web.xml. It will pass you the request/
response objects before the servlet/services are invoked to handle
them. Using this you can filter out most responses to return a
maintenance page, but allow certain IP's to pass through (typically
all the localhost IPs as well as your own).

On Oct 13, 12:24 pm, Arvind Rao <arvindrao....@gmail.com> wrote:
> Hello there
>
> I have a Java-based app hosted on GAE. I want to schedule daily downtime for
> my app to clean up the datastore.
>
> a) Is there any way I can bring down the app (i.e. stop serving requests
> from users and cron jobs), so that I can do a manual clean up using the
> Datastore Viewer or Admin? Right now if I disable the app, I'm not allowed

> to - "*Sorry, that operation is not allowed while the application is
> disabled.*".

[nischalshetty]

Just curious, is there a particular reason why you decided to clean up the database everyday rather than letting the data stay?

[Arvind Rao]

great, thanks all for your suggestions!

@nischal, it's a new app and i'm still sorting out some kinks, often get some bad data in there. since it's non-critical, i prefer to wipe out everything.

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[nischalshetty]

makes sense... you can run a map reduce to do that.... search for map reduce for appengine...