The Schedule Format of cron.xml

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The Schedule Format of cron.xml Larry 5/15/12 4:20 AM
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
Re: The Schedule Format of cron.xml Ian Marshall 5/16/12 2:15 AM
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?
Re: The Schedule Format of cron.xml Larry 5/16/12 7:13 PM
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:
Re: The Schedule Format of cron.xml Ian Marshall 5/17/12 1:15 AM
Thank you
---------
You're welcome.


In option 1: Do you mean using *etaMillis of **TaskOptions *using  to
specify the execute time?
-----------------------------------------------------------------------------------------------
Yes.


We can trigger a TaskInit by cron and create 48 tasks in queue(every
30 minutes) to avoid chain task.
-----------------------------------------------------------------------------------------------------
Good idea: I didn't think of that.


I just wish a simple syntax to support such requirement
-------------------------------------------------------
Me too.


On May 17, 3:13 am, Larry <kuei...@gmail.com> wrote:
> Hi Lan,
>     Thank you.
> In option 1:
>     Do you mean using *etaMillis of **TaskOptions *using  to specify the
Re: The Schedule Format of cron.xml Peter McKenzie 5/19/12 11:31 PM
Please create an issue on the issue tracker for this feature request.
Re: The Schedule Format of cron.xml Ian Marshall 5/20/12 1:40 PM
Done at

  http://code.google.com/p/googleappengine/issues/detail?id=7546