Ruslan Dautkhanov created KYLIN-3138:
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Summary: cuboids on-demand build
Key: KYLIN-3138
URL: https://issues.apache.org/jira/browse/KYLIN-3138
Project: Kylin
Issue Type: New Feature
Components: General, Job Engine, Query Engine, Spark Engine
Affects Versions: v2.2.0
Reporter: Ruslan Dautkhanov
Assignee: Shaofeng SHI
Priority: Critical
We just started using Kylin and quite like it so far.
Although some of the datasets we have a quite like to even consider for OLAP
cubing.
Unless those cuboids will be built on-demand.
I know some commercial non-open source products do this successfully.
This idea is to build a cuboid only when a user actually needs it.
So for example, our BI dashboards does a certain rollup, so then a SQL
query hits Kylin backend. Kylin realizes it hasn't built that particular cuboid
just yet,
so immediately starts building it. Users has to wait a bit longer first time
it request that combination of dimensions. But all other requests or requests
of other users will be fast from that point on.
Kylin (or any other OLAP solution) wouldn't be feasible to use on very wide
datasets
unless this on-demand functionality is implemented. For example, some datasets
we have have 100-200 dimensions. And we don't know up front rollups users would
want to do.
Suggesting to have a new dimension build rule "lazy / on-demand". All previous
rules apply. This new rule type would mean, a cuboid for a particular set of
dimensions wouldn't be built up-front if it's marked as "lazy / on-demand".
Thoughts / ideas?
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