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Posted to issues@kylin.apache.org by "fengYu (JIRA)" <ji...@apache.org> on 2016/10/07 07:14:20 UTC

[jira] [Created] (KYLIN-2064) add non-runtime-aggregation measure support

fengYu created KYLIN-2064:
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             Summary: add non-runtime-aggregation measure support
                 Key: KYLIN-2064
                 URL: https://issues.apache.org/jira/browse/KYLIN-2064
             Project: Kylin
          Issue Type: Improvement
    Affects Versions: v1.5.2
            Reporter: fengYu
            Assignee: fengYu


Kylin is based on pre-computation and store result in hbase. however, It support runtime aggregation to satisfy the query which can not match computed data.

But the runtime aggregation slow down the query and need more storage space in hbase(which will slow down scan speed),  such as distinct count/ topn measures .

So we can use more pre-compution and less runtime aggregation, in some scenario we do not need results cross different partition(date),  we add a kind of measure which only support result for count distinct, it will speed up query and need less storage.

what's more, If a query on this measure which is not computed it will return exception.

I will arrange our solution in my patch later.




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