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https://issues.apache.org/jira/browse/KYLIN-5834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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pengfei.zhan resolved KYLIN-5834.
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Resolution: Fixed
> The system reports error when the number of models exported exceeds 256 at a
> time
> ---------------------------------------------------------------------------------
>
> Key: KYLIN-5834
> URL: https://issues.apache.org/jira/browse/KYLIN-5834
> Project: Kylin
> Issue Type: Bug
> Components: Metadata
> Affects Versions: 5.0-beta
> Reporter: Zhimin Wu
> Assignee: Zhimin Wu
> Priority: Major
> Fix For: 5.0.0
>
>
> *Back Ground*
> Kylin's model export feature generates a compressed package containing all
> selected models for export. However, when the number of selected models
> exceeds 256, the export function will fail and display an unfriendly error
> message to the user on a separate page, indicating an
> "IndexOutOfBoundsException: Index: 256".
> *Root Cause*
> The size of the list received from the frontend has exceeded the maximum
> limit set for form-urlencoded request parameters in Spring. The default limit
> for the automatic growth of arrays and collections in Spring's DataBinder
> class is 256.
> *Dev Design*
> A new system configuration item,
> "kylin.web.data-binder.auto-grow-collection-limit", has been added to
> "KylinConfigBase.java". This item allows users to set the limit for the size
> of array lists when handling request parameters. The default value is 256.
> In the base controller class "NBasicController.java", the parameter
> "autoGrowCollectionLimit" is set to the value of the system configuration
> item "kylin.web.data-binder.auto-grow-collection-limit". It should be noted
> that setting this value too high could potentially lead to out of memory
> errors if the application is subject to network attacks, such as a request
> containing "ids[100000]". This change will affect all subclasses that inherit
> from the base controller class.
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