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https://issues.apache.org/jira/browse/KYLIN-1323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15151677#comment-15151677
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liyang commented on KYLIN-1323:
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This will be great improvement to total build time. Thanks Yerui!
I have no further comment at this point. Just one thing, please make sure it's
well tested. Seems current integration test in sandbox cannot cover this
feature, since the current sample cubes are too small. *Could there be a trick
to enable the coverage?* This is critical feature.
> Improve performance of converting data to hfile
> -----------------------------------------------
>
> Key: KYLIN-1323
> URL: https://issues.apache.org/jira/browse/KYLIN-1323
> Project: Kylin
> Issue Type: Improvement
> Components: Job Engine
> Affects Versions: v1.2
> Reporter: Yerui Sun
> Assignee: Yerui Sun
> Fix For: v2.0, v1.3
>
> Attachments: KYLIN-1323-1.x-staging.patch
>
>
> Supposed that we got 100GB data after cuboid building, and with setting that
> 10GB per region. For now, 10 split keys was calculated, and 10 region
> created, 10 reducer used in ‘convert to hfile’ step.
> With optimization, we could calculate 100 (or more) split keys, and use all
> them in ‘covert to file’ step, but sampled 10 keys in them to create regions.
> The result is still 10 region created, but 100 reducer used in ‘convert to
> file’ step. Of course, the hfile created is also 100, and load 10 files per
> region. That’s should be fine, doesn’t affect the query performance
> dramatically.
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