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HomeHomeOur CommunityOur CommunityGeneral Discuss...General Discuss...Scheduler executing item concurrentlyScheduler executing item concurrently
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4/27/2009 4:25 PM
 
Brad Hurley

Joined: 12/26/2007
Posts: 2

I am getting SQL Server deadlock errors appearing in my DNN event log, which I've tracked back to the SearchEngineScheduler item.  As I investigated, I have found that the scheduler is sometimes running multiple occurrences of the SearchEngineScheduler Item at the same time (up to 8 at a time).  I'm trying to figure out why the scheduler would do that.

I'm currently running DNN 4.8.2.  The scheduler is set to run in Timer mode.  The scheduled item is set to run once every 10 minutes, with no retry interval, and with no catchup.  After changing the settings on the scheduler and scheduler item, I restarted the IIS worker process to make sure that settings weren't being cached.

Here's a sample of the schedule history for this item.  In this case, everything ran successfully, but that is the exception rather than the rule:

Description Duration (seconds) Succeeded Start/End/Next Start
DotNetNuke.Services.Search.SearchEngineScheduler, DOTNETNUKE
Completed re-indexing content 		112.11 True S: 4/27/2009 3:38:35 PM
E: 4/27/2009 3:40:27 PM
N: 4/27/2009 3:48:35 PM
DotNetNuke.Services.Search.SearchEngineScheduler, DOTNETNUKE
Completed re-indexing content 		113.72 True S: 4/27/2009 3:38:31 PM
E: 4/27/2009 3:40:24 PM
N: 4/27/2009 3:48:31 PM
DotNetNuke.Services.Search.SearchEngineScheduler, DOTNETNUKE
Completed re-indexing content 		121.593 True S: 4/27/2009 3:38:29 PM
E: 4/27/2009 3:40:30 PM
N: 4/27/2009 3:48:29 PM
DotNetNuke.Services.Search.SearchEngineScheduler, DOTNETNUKE
Completed re-indexing content 		118.126 True S: 4/27/2009 3:38:12 PM
E: 4/27/2009 3:40:10 PM
N: 4/27/2009 3:48:12 PM
DotNetNuke.Services.Search.SearchEngineScheduler, DOTNETNUKE
Completed re-indexing content 		115.44 True S: 4/27/2009 3:37:56 PM
E: 4/27/2009 3:39:51 PM
N: 4/27/2009 3:47:56 PM
DotNetNuke.Services.Search.SearchEngineScheduler, DOTNETNUKE
Completed re-indexing content 		108.75 True S: 4/27/2009 3:37:41 PM
E: 4/27/2009 3:39:29 PM
N: 4/27/2009 3:47:41 PM
DotNetNuke.Services.Search.SearchEngineScheduler, DOTNETNUKE
Completed re-indexing content 		105.28 True S: 4/27/2009 3:37:25 PM
E: 4/27/2009 3:39:10 PM
N: 4/27/2009 3:47:25 PM
DotNetNuke.Services.Search.SearchEngineScheduler, DOTNETNUKE
Completed re-indexing content 		109.643 True S: 4/27/2009 3:37:06 PM
E: 4/27/2009 3:38:56 PM
N: 4/27/2009 3:47:06 PM
DotNetNuke.Services.Search.SearchEngineScheduler, DOTNETNUKE
Completed re-indexing content 		52.143 True S: 4/27/2009 3:36:50 PM
E: 4/27/2009 3:37:42 PM
N: 4/27/2009 3:46:50 PM
DotNetNuke.Services.Search.SearchEngineScheduler, DOTNETNUKE
Completed re-indexing content 		40.267 True S: 4/27/2009 3:36:34 PM
E: 4/27/2009 3:37:14 PM
N: 4/27/2009 3:46:34 PM
DotNetNuke.Services.Search.SearchEngineScheduler, DOTNETNUKE
Completed re-indexing content 		32.563 True S: 4/27/2009 3:28:28 PM
E: 4/27/2009 3:29:00 PM
N: 4/27/2009 3:38:28 PM

Any thoughts on why the scheduler is running the SearchEngineSchedule multiple times concurrently?  If I can figure this out, I'm pretty sure the deadlock error will disappear.

Brad
 
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4/28/2009 4:09 AM
 
Sebastian Leupold


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www.dnnwerk.de
Joined: 3/8/2004
Posts: 46212

 try to clear the search tables and re-index your site. 

Cheers from Germany,
Sebastian Leupold

dnnWerk - The DotNetNuke Experts   German Spoken DotNetNuke User Group

Speed up your DNN Websites with TurboDNN
 
New Post
4/28/2009 10:44 AM
 
Brad Hurley

Joined: 12/26/2007
Posts: 2

Thank you for your idea.  I ran this SQL, and the problem continues.  The next time the scheduler ran this job after I ran the script, it ran four instances of this job at the same time.  I expect that I will continue to have deadlock problems because the job is running multiple times.  Any other thoughts?
 
New Post
5/1/2009 11:37 AM
 
Jon Semkiw

Joined: 3/22/2006
Posts: 8

We're having the same problem with the scheduler running events multiple times.  We haven't been been able to pinpoint exactly where the problem is coming from.  We've tried various configs of the scheduler and it's the same problem.  We have 5 different scheduled tasks running and all of them from time to time will run 2 or more times.  The number of times they run seems random (although I'm sure it's not).  I've spent many hours trying to track down a solution to this problem and it has been reported on multiple threads but there appears to be no solution. Below is an example of the problem for purge users online but the problem is similar for all tasks.  Any help or direction is greatly appreciated.  Thanks

DotNetNuke.Entities.Users.PurgeUsersOnline, DOTNETNUKE
UsersOnline purge completed. 		0.733 True S: 5/1/2009 11:32:32 AM
E: 5/1/2009 11:32:32 AM
N: 5/1/2009 11:33:32 AM
DotNetNuke.Entities.Users.PurgeUsersOnline, DOTNETNUKE
UsersOnline purge completed. 		0.28 True S: 5/1/2009 11:31:30 AM
E: 5/1/2009 11:31:31 AM
N: 5/1/2009 11:32:30 AM
DotNetNuke.Entities.Users.PurgeUsersOnline, DOTNETNUKE
UsersOnline purge completed. 		2.533 True S: 5/1/2009 11:31:29 AM
E: 5/1/2009 11:31:32 AM
N: 5/1/2009 11:32:29 AM
DotNetNuke.Entities.Users.PurgeUsersOnline, DOTNETNUKE
UsersOnline purge completed. 		0.107 True S: 5/1/2009 11:30:28 AM
E: 5/1/2009 11:30:28 AM
N: 5/1/2009 11:31:28 AM
DotNetNuke.Entities.Users.PurgeUsersOnline, DOTNETNUKE
UsersOnline purge completed. 		1.156 True S: 5/1/2009 11:29:54 AM
E: 5/1/2009 11:29:55 AM
N: 5/1/2009 11:30:54 AM
DotNetNuke.Entities.Users.PurgeUsersOnline, DOTNETNUKE
UsersOnline purge completed. 		0.156 True S: 5/1/2009 11:28:53 AM
E: 5/1/2009 11:28:53 AM
N: 5/1/2009 11:29:53 AM
DotNetNuke.Entities.Users.PurgeUsersOnline, DOTNETNUKE
UsersOnline purge completed. 		0.05 True S: 5/1/2009 11:28:53 AM
E: 5/1/2009 11:28:53 AM
N: 5/1/2009 11:29:53 AM
DotNetNuke.Entities.Users.PurgeUsersOnline, DOTNETNUKE
UsersOnline purge completed. 		0.937 True S: 5/1/2009 11:28:42 AM
E: 5/1/2009 11:28:43 AM
N: 5/1/2009 11:29:42 AM
DotNetNuke.Entities.Users.PurgeUsersOnline, DOTNETNUKE
UsersOnline purge completed. 		0.05 True S: 5/1/2009 11:27:40 AM
E: 5/1/2009 11:27:40 AM
N: 5/1/2009 11:28:40 AM

 
New Post
5/1/2009 11:51 AM
 
Mitchel Sellers


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www.mitchelsellers.com
Joined: 1/24/2007
Posts: 7846

It sounds like you have Web Gardening enabled that spawns multiple ASP.NET processes for the same application.

I would ensure that in the IIS configuration that you do NOT have web gardening enabled!

-Mitchel Sellers
Microsoft MVP, ASPInsider, DNN MVP
CEO/Director of Development - IowaComputerGurus Inc.
LinkedIn Profile

Visit mitchelsellers.com for my mostly DNN Blog and support forum.

Visit IowaComputerGurus.com for free DNN Modules, DNN Performance Tips, DNN Consulting Quotes, and DNN Technical Support Services
 
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