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https://issues.apache.org/jira/browse/KYLIN-1768?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shaofeng SHI resolved KYLIN-1768.
---------------------------------
Resolution: Duplicate
> NDCuboidMapper throws ArrayIndexOutOfBoundsException when dimension is fixed
> length encoded to more than 256 bytes
> ------------------------------------------------------------------------------------------------------------------
>
> Key: KYLIN-1768
> URL: https://issues.apache.org/jira/browse/KYLIN-1768
> Project: Kylin
> Issue Type: Bug
> Components: Job Engine
> Affects Versions: v1.5.2
> Reporter: Dayue Gao
> Assignee: Shaofeng SHI
> Priority: Major
> Fix For: v2.4.0
>
>
> When user defined a dimension which is fixed length encoded to more than 256
> bytes, "Build N-Dimension Cuboid Data" step failed in map phase. The stack
> trace is shown below:
> {noformat}
> Error: java.lang.ArrayIndexOutOfBoundsException at
> java.lang.System.arraycopy(Native Method)
> at org.apache.kylin.cube.common.RowKeySplitter.split(RowKeySplitter.java:103)
> at
> org.apache.kylin.engine.mr.steps.NDCuboidMapper.map(NDCuboidMapper.java:125)
> at
> org.apache.kylin.engine.mr.steps.NDCuboidMapper.map(NDCuboidMapper.java:49)
> at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:145)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:167)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
>
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)
> {noformat}
> The reason is that `RowKeySplitter` is hardcoded to 65 splits and 256 bytes
> per split, and trying to put a larger encoded dimension throws
> ArrayIndexOutOfBoundsException.
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