Записки программиста, обо всем и ни о чем. Но, наверное, больше профессионального.

2012-11-20

Отваливается долгий запрос

Недавно брат по оружию столкнулся с ужасным противником в лице темной и непрозрачной многокомпонентности геопроцессинга в ArcGIS. Запрос уходит в службу геопроцессинга через REST интерфейс, служба долго думает и все заканчивается сообщением о тайм-ауте.

In Fiddler we are getting timeout exception in stack trace.

Server Error in ‘/ArcGIS/rest’ Application.
Request timed out. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Web.HttpException: Request timed out.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[HttpException (0x80004005): Request timed out.]

After going through all ESRI/Microsoft forums. I have increased a) Increased executiontime out value in web.config b) Increased GP Tool client timeout values , but nothing worked and application fails with same mesage. The REST tool is working fine when this executed from browser and URL is available and correct.


Хорошо, что хорошо кончается, добрые люди помогли и боец порешал проблему, суть которой в том, что IIS использует свои собственные таймауты и по их истечению убивает «зависший» поток.

The process got terminated so that it couldn’t do logging in ArcGIS Server level so that exception didn’t happen inside of the service call handling. This means that the query handling thread got terminated from ASP.NET / IIS level. We have got some clue from ESRI Forum as well.
We have added <httpRuntime executionTimeout=”7200″/> in Web.config file under C:\inetpub\wwwroot\ArcGIS\rest folder and our issues are resolved. This value extended the execution time out and process ran smoothly and client application displayed the results as well.
Finally we learnt from this link  ”Since ASP.NET timeout is internally implemented so that the check fires in every 15 seconds. When using the default value, the ASP.NET aborts the query thread in 110 – 125 seconds


Не забывайте оттюнить web.config
Кстати, из статьи так и не понятно, какая модель веб-сервиса геопроцессинга была использована — синхронная или асинхронная.


original post http://vasnake.blogspot.com/2012/11/blog-post_20.html

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