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https://issues.apache.org/jira/browse/KYLIN-3742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16729285#comment-16729285
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ASF GitHub Bot commented on KYLIN-3742:
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allenma commented on pull request #417: KYLIN-3742 Fix DataRequest for NPE and 
add some javadoc
URL: https://github.com/apache/kylin/pull/417
 
 
   
 
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> DataRequest fail to deserialized 
> ---------------------------------
>
>                 Key: KYLIN-3742
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3742
>             Project: Kylin
>          Issue Type: Bug
>          Components: Streaming
>            Reporter: XiaoXiang Yu
>            Assignee: XiaoXiang Yu
>            Priority: Critical
>         Attachments: image-2018-12-26-19-25-31-341.png, 
> image-2018-12-26-19-26-44-418.png, image-2018-12-26-19-27-15-397.png, 
> image-2018-12-26-19-29-13-404.png, image-2018-12-26-19-38-10-451.png, 
> image-2018-12-26-19-39-19-039.png, image-2018-12-26-19-42-10-589.png
>
>
> DataRequest send to Streaming Receiver is cannot be deserialized successfully 
> because of 
> ParameterDesc's equals method throw a NPE for field null +_colRef._+
>  1. This Receiver Server 's error log.
> !image-2018-12-26-19-25-31-341.png!
>  
>  
> 2. This the request send by query server. It is a Normal JSON.
> !image-2018-12-26-19-42-10-589.png!  
> !image-2018-12-26-19-29-13-404.png!
>  
>  
> 3. Spring MVC will try to deserialized json string into DataRequest. And 
> filed mertics of DataRequest it is a Set.
>  
> !image-2018-12-26-19-38-10-451.png!
>  
> 4. HashSet use equal method to distinct entry. But equals method will throw 
> NPE.
>  
> !image-2018-12-26-19-39-19-039.png!



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