Hi Lan,
    Thank you. 
In option 1:
    Do you mean using *etaMillis of **TaskOptions *using  to specify the 
execute time?
This could be a solution. We can trigger a TaskInit by cron and create 48 
tasks in queue(every 30 minutes)
to avoid chain task.


In option 2:
    This is my first thought about cron.xml . I just wish a simple syntax 
to support such requirement.
If I change the schedule from 30 minutes to 2 minutes, the cron.xml will be 
1800 entries.





Ian Marshall於 2012年5月16日星期三UTC+8下午5時15分11秒寫道:
>
> Your syntax problem may lie within your "schedule" tag (mix of month 
> and every, and unwanted final comma): 
>
>   <schedule>1,15, of month every 2 hours</schedule> 
>
> Your "description" tag and posting text do not match the every 2 hours 
> in your "schedule" tag. Assuming that you want to run every 30 
> minutes... 
>
> Option 1: try 
>
>   <schedule>1,15 of month 00:00</schedule> 
>
> and at the end of your scheduled task enqueue a task to execute 30 
> minutes later, if this would be within the same day. 
>
>
> Option 2: try 
>
>   <schedule>1,15 of month 00:00</schedule> 
>   <schedule>1,15 of month 00:30</schedule> 
>   <schedule>1,15 of month 01:00</schedule> 
>   <schedule>1,15 of month 01:30</schedule> 
>   ... 
>   <schedule>1,15 of month 23:30</schedule> 
>
> This is more robust than chaining enqueued tasks kicked off by a 
> scheduled task, but would be more cumbersome to code, since you will 
> need a cron entry for each schedule. 
>
>
> Is this any help? 
>
>
> On May 15, 12:20 pm, Larry <kuei...@gmail.com> wrote: 
> > Hello All, 
> >      Is it possible to execute my job as following: 
> > 
> > <?xml version="1.0" encoding="UTF-8"?> 
> > <cronentries> 
> >   <cron> 
> >     <url>/mytask</url> 
> >     <description>Execute my task, every 30 minutes of first and15th of 
> > month  </description> 
> >     <schedule>1,15, of month every 2 hours</schedule> 
> >     <timezone>America/New_York</timezone> 
> >   </cron> 
> > </cronentries> 
> > 
> > This syntax is wrong and fail to deploy to GAE. 
> > I tested another solution. Execute mytask every 30 minutes. Execute the 
> > real task only the date is 1 and 15. 
> > I check the dashboard. The Frontend Instance Hours increase 
> dramatically. 
> > 
> > Any thoughts? 
> > Larry

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