Scheduler Threads

Scheduling tidbits today ...
Chatting to Kei about our scheduling engine for the standalone release today. We use an open source scheduler, Quartz from OpenSymphony- seems to have everything we need. The conversation stemmed from question about how the engine handle multiple requests at a time and can priorities be set on a given job.


The first question was asking if multiple jobs arrive at the scheduler at the same time either from multiple users or may be from web service calls are they then run in parallel or series? The scheduling engine can be set up with a number of given threads to execute jobs. By default we set this to 3, if you want more or less you can change this. We do not currently provide an UI for this but its easier enough to change. Under the reports repository directory you can get to the quartz config file:


Admin/Scheduler/quartz-config.properties


In that file you'll an entry to set the number of threads:


org.quartz.threadPool.threadCount=3


If you make a change then you'll need to bounce the server for the change to take effect. Quartz makes some recommendations that we would echo on the thread count:


Can be any positive integer, although you should realize that only numbers between 1 and 100 are very practical. This is the number of threads that are available for concurrent execution of jobs. If you only have a few jobs that fire a few times a day, then 1 thread is plenty! If you have tens of thousands of jobs, with many firing every minute, then you probably want a thread count more like 50 or 100 (this highly depends on the nature of the work that your jobs perform, and your systems resources!).


The second question on prioritizing jobs is tougher, the Quartz scheduler does not currently support prioritization although I have mention of plans to support it sometime in the future, so we are a little stuck. We are looking at handling that from our side to queue up the jobs we send to quartz but no commitments or dates, sorry.

Comments:

Tim, Thanks you very much for clarifying how we can tweak this and at least it makes me more confident that the application will be running stable at all times, even when more jobs are scheduled at the same time then the actual value of threadCount. I'm looking forward to see a bit more enhancements in the area of manageability of this great application call BI Publisher ... :-) Kind regards, Pieter Breugelmans Oracle - Global Customer Support

Posted by Pieter Breugelmans on May 27, 2008 at 06:04 PM MDT #

Hi Tim, I have an SR for an Enterprise BIP 10.1.3.2 where the data template has sql to get the report date as sysdate -3. The purpose of this is to schedule this report to run on Wednesdays but to put the previous Sundays date on it. When the report is run manually (as a single request), the data returns as expected (sysdate -3). But when run from the scheduler, it substracts 4 days, giving the previous Saturdays date instead of the Sunday date. The where clause of the statement looks like: where dateadd(dd,-4,V_BIC.CHEKDATE) = CASE WHEN :EndDate IS NULL THEN CONVERT(datetime, CONVERT(varchar, DATEADD(dd,-3,GETDATE()), 102), 102) ELSE :EndDate Any idea what is happening in the scheduler (Quartz code?) that could cause this?

Posted by paul macdonald on July 28, 2008 at 04:23 AM MDT #

Hi Paul The only thing I can think of right now is that the scheduler date is not correct ie the machine its running on. But if you can run it immediately and get the right result this would suggest there is not a problem. Whats the SR number and I'll ask the dev team to look into it. Tim

Posted by Tim on August 04, 2008 at 02:41 AM MDT #

hi Tim, thanks for the reply and sorry for the delay. The SR is 6901490.993. And yes, the date on the server was about the first thing I had checked when I first saw the tar.

Posted by paul macdonald on August 13, 2008 at 08:31 AM MDT #

Thankyou for the update and sorry for delay in responding. The first thing I checked in the SR was if the scheduler date was correct on the server its running on and it was. I look forward to your thoughts on the issue.

Posted by paul macdonald on August 14, 2008 at 06:57 AM MDT #

Hello, Are there any Admin reports that come with BI Publisher. I have someone who is used to Discoverer and want to know from a PUBlisher perspective which user have access to which reports or Folders. what access rights different users have. Is there any way the Bi Publisher administrators can access this type of info.

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