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From Dan Burkert <...@cloudera.com>
Subject Re: Sparse Data
Date Thu, 12 May 2016 21:21:47 GMT
Hi Ben,

Kudu doesn't support sparse datasets with many columns very well.  Kudu's
data model looks much more like the relational, structured data model of a
traditional SQL database than HBase's data model.  Kudu doesn't yet have a
map column type (or any nested column types), but we do have BINARY typed
columns if you can handle your own serialization. Oftentimes, however, it's
better to restructure the data so that it can fit Kudu's structure better.
If you can give more information about your usage patterns (especially
details queries you wish to optimize for) I can perhaps give better info.

- Dan

On Thu, May 12, 2016 at 2:08 PM, Benjamin Kim <bbuild11@gmail.com> wrote:

> Can Kudu handle the use case where sparse data is involved? In many of our
> processes, we deal with data that can have any number of columns and many
> previously unknown column names depending on what attributes are brought in
> at the time. Currently, we use HBase to handle this. Since Kudu is based on
> HBase, can it do the same? Or, do we have to use a map data type column for
> this?
>
> Thanks,
> Ben
>
>

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