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https://issues.apache.org/jira/browse/KYLIN-3296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16405689#comment-16405689
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Billy Liu commented on KYLIN-3296:
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Nice found. 

> cube合并时,java.lang.ArrayIndexOutOfBoundsException at 
> java.lang.System.arraycopy(Native Method)
> ---------------------------------------------------------------------------------------------
>
>                 Key: KYLIN-3296
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3296
>             Project: Kylin
>          Issue Type: Bug
>          Components: Job Engine
>    Affects Versions: v2.3.0
>            Reporter: RenZhiMin
>            Priority: Major
>              Labels: patch
>         Attachments: RowKeySplitter.patch
>
>
> cube中,设计rowkey时,有个维度设置编码方式是固定长度500。每天采用内存构建算法。在合并cube时,在生成的mr中的map任务执行中出现“java.lang.ArrayIndexOutOfBoundsException
>  at java.lang.System.arraycopy(Native Method)” 
> 错误。经查看在生成的mr中的map任务中需要对要合并的cuboiddata数据的rowkey进行切分,切分时,根据每个维度的编码方式获取对应的长度,然后从rowkey中获取,并赋值给SplittedBytes的value中,由于value数组初始化时设置的固定值255,所以在切分大于255的维度值时,出现下标越界错误。



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