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From Billy Liu <billy...@apache.org>
Subject Re: Questions about data integrity in Kylin
Date Sat, 24 Feb 2018 02:56:30 GMT
Hi  BELLIER,

I suggest you reading some Kylin introduction document or slide. It
will explain how Kylin works, for example:
https://www.slideshare.net/XuJiang2/kylin-hadoop-olap-engine

With Warm regards

Billy Liu


2018-02-21 19:53 GMT+08:00 BELLIER Jean-luc <jean-luc.bellier@rte-france.com>:
> Hello,
>
>
>
> I was wondering about a few things :
>
> ·         When I launch a query using filters on PART_DT (from the sample
> model), e.g. WHERE PART_DT=’2013-12-31’, I get a result through the Kylin
> web interface, whereas it gives me a mistake in Hive and Impala, indicating
> an unknown type on PART_DT. Does it mean that the data are not queried
> directly in Hive, but through a “copy”.  This couls explain why the syntax
> “DEFAULT.<table name> does not work in the query editor.
>
> ·         What does happen when the Hive tables are populated ? Should I
> resynchronize the tables or not ?
>
> ·         How is the data integrity ensured ? As far as I can notice, there
> is no control on data through the model creation interface; this supposes
> that the data are initially well-formed. So how does Kylin manage this
> (input mistakes, …) ?
>
>
>
> Thank you in advance for your help. Have a good day.
>
>
>
> Best regards,
>
> Jean-Luc.
>
>
>
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