Hi Gianni,
If I understand correctly I can use the default handler for any
deferred task and thus specifying the url is irrelevant.
How would I send a 'deferred' Task to a specific queue? Like this?
QueueFactory.getQueue("email-
queue").add(TaskOptions.Builder.withPayload(newEmailTask(email)));
This seems to work indeed as
DeferredTaskContext.getCurrentRequest().getHeader("X-AppEngine-
QueueName") prints out the 'email-queue'. So that's great.
Now I've added queue.xml to WEB-INF folder with:
<queue-entries>
<queue>
<name>default</name>
<rate>1/s</rate>
<retry-parameters>
<min-backoff-seconds>1</min-backoff-seconds>
<task-retry-limit>5</task-retry-limit>
</retry-parameters>
</queue>
<queue>
<name>email-queue</name>
<rate>1/s</rate>
<retry-parameters>
<min-backoff-seconds>5</min-backoff-seconds>
<task-retry-limit>3</task-retry-limit>
</retry-parameters>
</queue>
<queue>
<name>other-queue</name>
<rate>1/s</rate>
</queue>
</queue-entries>
I've done some testing and inside the task I just throw an Exception
to test the retry parameters.
What I see is that the retry parameters are not picked up (at least in
Development server).
I keeps trying (more than the 3 time retry limit) and the backoff
seconds are also not used.
I see the first 3 or 4 retries within 2 seconds or so, and interval
starts increasing, nut 5 between each retry.
Could it be that the queue.xml is not picked up or I did something
wrong?
Thanks for your help and patience,
Marcel
On Apr 27, 12:09 am, Gianni Mariani <gian...@google.com> wrote:
> On Wed, Apr 27, 2011 at 4:19 AM, Marcel Overdijk
> <marceloverd...@gmail.com>wrote:
>
> > But is it possible to change queue settings for Deferred task?
>
> A DeferredTask is just like any other task. There is no restriction on
> DeferredTasks with respect to queue settings or which queues you put them
> in.
>
> The fact that a special handler exists for deferred task is inconsequential.
> It's just a simplification, in that you don't need to do that for yourself.
> i.e. if you do not specify a URL, it will work out of the box. The task is
> automatically set to the correct handler when you set the DeferredTask
> payload.
>
>
>
> > Like a deferred Email task I would like to throttle differently then
> > anotther queue (using Deferred Task(
>
> > So baically the questions are:
> > - With Deferred task, can you have multiple queues?
>
> Like any task. You can add a deferred task to any queue.
>
> > - Is it possible to change throttling configuration per Deferred task
> > queue?
>
> DeferredTasks may be placed in any queue.
>
> Just a note. You seem to be conflating handlers/servlet mappings with
> queues. There is nothing stopping you from having a single handler accept
> requests from any queue.
>
> In the case of the TaskOptions.payload(DeferredTask) method, it will
> automatically set the handler url for you if it is not otherwise specified.
> URL is somewhat irrelevant for deferred task since the run() method you
> define is essentially the "entry point" for the task.
>
>
>
>
>
> > On Apr 26, 4:59 pm, Gianni Mariani <gmari...@google.com> wrote:
> > > The preconfigured URL mapping for the DeferredTaskServlet may be used
> > > for any queue. There is no need to specify your own URL mapping that
> > > I can see.
>
> > > On Apr 22, 8:05 pm, Marcel Overdijk <marceloverd...@gmail.com> wrote:
>
> > > > I did some quick testing and I found out:
>
> > > > QueueFactory.getQueue("email-
> > > > queue").add(TaskOptions.Builder.withPayload(new
> > > > EmailTask(email)).url("/email-queue"));
>
> > > > that with above I can enqueue adeferredtaskin the another queue
> > > > (not default).
> > > > I had to to use the url("/email-queue") setting otherwise it was
> > > > pushed to the default __deferred__ handler.
>
> > > > I just configured the
> > > > com.google.apphosting.utils.servlet.DeferredTaskServlet and mapped it
> > > > to /email-queue
>
> > > > When I try System.out.println("queue name: " +
> > > > DeferredTaskContext.getCurrentRequest().getHeader("X-AppEngine-
> > > > QueueName"));
> > > > I see the correct e-mail-queue being printed thus so far everything
> > > > seems to work.
>
> > > > I also configured <task-retry-limit>5</task-retry-limit> for this
> > > > queue but this does not seem to work.
>
> > > > So the setup is working but the DeferredTask / DeferredTaskServlet do
> > > > not seem to look into the settings configured in queue.xml
>
> > > > Can somebody confirm this?
>
> > > Do you have more information on how you determined that this is not
> > > working?
>
> > > > On Apr 22, 11:13 am, Marcel Overdijk <marceloverd...@gmail.com> wrote:
>
> > > > > Maybe use additional mappings to
> > > > > com.google.apphosting.utils.servlet.DeferredTaskServlet
> > > > > The documentation onDeferredTasks is a little bit sparse... Any
> > > > > pointers appreciated.
>
> > > > > Basically what I would like to do is have multiple queue defined with
> > > > > different throttling settings.
> > > > > And use DeferredTask to send them to one of the queues depending on
> > > > > the my needs.
>
> > > > > I would have no problem with configuring additional servlet mappings
> > > > > using com.google.apphosting.utils.servlet.DeferredTaskServlet
>
> > > > > On Apr 22, 8:58 am, Marcel Overdijk <marceloverd...@gmail.com>
> > wrote:
>
> > > > > > Is it possible to useDeferredTasks outside the default queue?
>
> > > > > > I would like to setup multiple queues with different config
> > settings.
>
> > > > > > For theDeferredTasks a specific handler is setup at /_ah/queue/
> > > > > > __deferred__ so I wonder how that would work with multiple
> > queues....
>
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>
> --
> Gianni Mariani
> Google, Sydney
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