[jira] [Commented] (KYLIN-3831) 唯独超过62生成cuboid 错误

[Shaofeng SHI (JIRA)]

[ 
https://issues.apache.org/jira/browse/KYLIN-3831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16789199#comment-16789199
 ] 

Shaofeng SHI commented on KYLIN-3831:
-

The document has been updated with such a description:
|Max columns in Rowkey, and it can not be more than 63|

> 唯独超过62生成cuboid 错误
> -
>
> Key: KYLIN-3831
> URL: https://issues.apache.org/jira/browse/KYLIN-3831
> Project: Kylin
>  Issue Type: Wish
>  Components: Others
>Affects Versions: v2.3.1
>Reporter: zhangwei
>Assignee: zhangwei
>Priority: Minor
>




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[jira] [Commented] (KYLIN-3831) 唯独超过62生成cuboid 错误

[zhangwei (JIRA)]

[ 
https://issues.apache.org/jira/browse/KYLIN-3831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16778830#comment-16778830
 ] 

zhangwei commented on KYLIN-3831:
-

I agree~, if keep the original design, the value of  
'kylin.cube.rowkey.max-size' shouldn't great than 63, I think this should be 
highlight in below guild book other user my change it to higher value and see 
wired exception  like "Cuboid " + cuboid + " is out of scope 0-" + max)
http://kylin.apache.org/docs23/install/configuration.html








> 唯独超过62生成cuboid 错误
> -
>
> Key: KYLIN-3831
> URL: https://issues.apache.org/jira/browse/KYLIN-3831
> Project: Kylin
>  Issue Type: Wish
>  Components: Others
>Affects Versions: v2.3.1
>Reporter: zhangwei
>Assignee: zhangwei
>Priority: Minor
>




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[jira] [Commented] (KYLIN-3831) 唯独超过62生成cuboid 错误

[Billy Liu (JIRA)]

[ 
https://issues.apache.org/jira/browse/KYLIN-3831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16778043#comment-16778043
 ] 

Billy Liu commented on KYLIN-3831:
--

[~photogamrun] The limitation is by design. Kylin use the _long-length_ bits to 
define the dimensions. 

> 唯独超过62生成cuboid 错误
> -
>
> Key: KYLIN-3831
> URL: https://issues.apache.org/jira/browse/KYLIN-3831
> Project: Kylin
>  Issue Type: Wish
>  Components: Others
>Affects Versions: v2.3.1
>Reporter: zhangwei
>Assignee: zhangwei
>Priority: Minor
>




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[jira] [Commented] (KYLIN-3831) 唯独超过62生成cuboid 错误

[zhangwei (JIRA)]

[ 
https://issues.apache.org/jira/browse/KYLIN-3831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16777694#comment-16777694
 ] 

zhangwei commented on KYLIN-3831:
-

kylin.cube.rowkey.max-size　这个参数其实不能设置超过默认的63 
因为生成cuboid的算法对64位的long做位移，一旦维度过多就会算出cuboid = -1 导致无法生成cube

测试代码
public class TestBitIndex { public static void main(String[] args) { long 
fullMask = 0L; for (int i = 62; i >=0 ; i--) { fullMask |= 1L << i; } 
System.out.println(fullMask); } }

9223372036854775807

public class TestBitIndex { public static void main(String[] args) { long 
fullMask = 0L; for (int i = 65; i >=0 ; i--) { fullMask |= 1L << i; } 
System.out.println(fullMask); } }

-1

DefaultCuboidScheduler
@Override
public List getSpanningCuboid(long cuboid) {
if (cuboid > max || cuboid < 0) {
throw new IllegalArgumentException("Cuboid " + cuboid + " is out of 
scope 0-" + max);
}

List spanning = parent2child.get(cuboid);
if (spanning == null) {
return Collections.EMPTY_LIST;
}
return spanning;
}

> 唯独超过62生成cuboid 错误
> -
>
> Key: KYLIN-3831
> URL: https://issues.apache.org/jira/browse/KYLIN-3831
> Project: Kylin
>  Issue Type: Wish
>  Components: Others
>Affects Versions: v2.3.1
>Reporter: zhangwei
>Priority: Minor
>




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