Timeout reading page list errors

Vote:

We have a developed a site that will start throwing "EPiServer.Core.EPiServerException: Timeout reading page list" errors. This usually happens on the site itself and sometimes in the navigation pane of the edit section. The site is running in its own App Pool which when restarted stops the errors appearing. But only briefly. Here is the stack trace:


[EPiServerException: Timeout reading page list]
   EPiServer.DataFactoryCache.ᐁ(PageReference ) +759
   EPiServer.DataFactory.ᐁ(PageReference ) +165
   EPiServer.DataFactory.GetChildren(PageReference pageLink, ILanguageSelector selector, AccessLevel access) +532
   EPiServer.WebControls.ExplorerTree.GetChildren(PageReference pageLink) +108
   EPiServer.PageTreeLoader.ᐁ(TreeState , PageReference , Boolean , Int32 ) +64
   EPiServer.PageTreeLoader.ᐁ(TreeState , PageReference , Boolean , Int32 ) +261
   EPiServer.PageTreeLoader.GetPageTree(PageReference parent, PageReference[] openPages, IPageSource pageSource, Int32 nrOfLevels) +177
   EPiServer.WebControls.PageTreeData.PopulatePages(PageDataCollection pages) +332
   EPiServer.WebControls.PageControlBase.ᐁ() +44
   EPiServer.WebControls.ExplorerTree.Render(HtmlTextWriter output) +45
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +130
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +24
   System.Web.UI.WebControls.Label.RenderContents(HtmlTextWriter writer) +1796043
   System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +29
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +130
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +24
   System.Web.UI.WebControls.Label.RenderContents(HtmlTextWriter writer) +1796043
   System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +29
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +130
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +24
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +59
   System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +68
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +37
   ASP.edit_edittree_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in d:\WebSpace\Staffing2\edit\EditTree.aspx:146
   SEOViewState.code.EventHandler.FilterHtml(HtmlTextWriter writer, Control container) +100
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +2065835
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +24
   System.Web.UI.Page.Render(HtmlTextWriter writer) +26
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1896

Another trace:


[EPiServerException: Timeout reading page data]
   EPiServer.DataFactoryCache.ᐁ(PageReference ) +775
   EPiServer.DataFactory.ᐁ(PageReference , ILanguageSelector ) +169
   EPiServer.DataFactory.GetPage(PageReference pageLink, ILanguageSelector selector, AccessLevel access) +910
   EPiServer.DataFactory.GetPage(PageReference pageLink, AccessLevel access) +88
   EPiServer.DataFactory.GetPage(PageReference pageLink) +24
   EPiStaffingWeb.libraries.MagicPageFetcher.Level(Int32 PageRef) +163
   EPiStaffingWeb.libraries.MagicPageFetcher.Level(PageData aPage, String aProperty) +138
   EPiStaffingWeb.libraries.MagicPageFetcher.CalcMagic(PageData aPageToCalc, PageData aRelativePage) +137
   EPiStaffingWeb.libraries.MagicPageFetcher.MagicCalc(Object anObject) +51
   EPiStaffingWeb.libraries.MagicPageFetcher.Compare(Object x, Object y) +18
   System.SorterObjectArray.QuickSort(Int32 left, Int32 right) +103

[InvalidOperationException: Failed to compare two elements in the array.]
   System.SorterObjectArray.QuickSort(Int32 left, Int32 right) +301
   System.Array.Sort(Array keys, Array items, Int32 index, Int32 length, IComparer comparer) +366
   System.Collections.ArrayList.Sort(Int32 index, Int32 count, IComparer comparer) +56
   System.Collections.ArrayList.Sort(IComparer comparer) +26
   EPiServer.Core.PageDataCollection.Sort(IComparer comparer) +12
   EPiStaffingWeb.libraries.MagicPageFetcher.MagicFilter(PageDataCollection allPages) +69
   EPiStaffingWeb.libraries.GenericPageFetcher.GetPages(IncludePage anIncludeFunction) +33
   EPiStaffingWeb.templates.Units.StaffingScrollamatic.Page_Load(Object sender, EventArgs e) +214
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +34
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +47
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1061

#17558

Aug 30, 2006 8:13

Vote:

Hi Jason, Have you been able to fix this problem yet? We've currently in the same situation ourselves. Please assist if possible. Sincerely, Ronny Dahl (mail@ronnydahl.com)

#18392

Dec 18, 2006 14:40

Vote:

Hi Ronny, I work with Jason and, I'm afraid, I may have bad news for you. We were NOT able to fix this issue. We bsaically worked around it. We discovered we had some code in a library that was doing a LARGE number of page reads to help produce some dynamic data. In order to fix this problem we ended up caching some of the search results that were being executed by the library that were being frequently called. This solved all of our problems we were experiencing and also increased the performance of the system. I recommend you seriously consider the design of your site and perhaps rethink any parts of it that may be pulling dynamic content in. Cheers, Cameron

#18393

Dec 20, 2006 0:50

pontus.emilsson@modul1.se

Vote:

We have an installation where the same problem occurs now and then. This is very strange, because: * The error (timeout reading page list) is thrown quickly. Within half a second or so. * There is hardly any load on the site. Very few visitors. * The error sometimes occur on page lists containing only a handful of pages. I would be very grateful for tips regarding how to solve this issue!

#18394

Feb 05, 2007 11:00

Patrik Berglund

Vote:

Hmm... Sounds a bit like re-inventing the wheel when you have to create a custom caching solution to cache pages already cached by EPiServer... Has anyone at EPiServer looked into this, and tried to reproduce the errors? Are there any load test reports available where you can see how many simultaneous users EPiServer can handle before it starts dumping error messages everywhere? Regards, /Patrik

#18395

Mar 14, 2007 14:13

Per Hemmingson

Vote:

Hi all. This issue has now been fixed in Hotfix 5 for 4.61. Issue #45340 The Datafactory Cache logic may cause several database request for the same page/page list http://www.episerver.com/en/EPiServer_Knowledge_Center/Download2/Hotfixes/EPiServer-461---Hotfix-5/ Note: Before installing any hotfix, please remember that these packages are not subject to testing in the same extent as publicly released code. Make sure to backup old files and database before applying any hotfix.

#18396

May 10, 2007 10:56

Christina Norberg

Vote:

In some special cases this has not been resolved in hotfix 5. We have made a inofficial hofix 6 that will be included in version 4.62 that will be released soon. If this is a critical problem for anyone, please contact Episerver support (http://www.episerver.com/en/EPiServer_Knowledge_Center/Support/)and we will send this hofix to you.

#18397

Oct 05, 2007 10:49

Jonas Hjalmarsson

Vote:

hotfix 6 finally solved the problem for me! Thanx...

#18398

Oct 12, 2007 8:00