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https://issues.apache.org/jira/browse/KYLIN-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15784573#comment-15784573
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Shaofeng SHI commented on KYLIN-2328:
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+1 good points; when there are lots of segment, each time submitting all
segments' dict repeatedly is expensive, this patch optimized this very well.
> Reduce the size of metadata uploaded to distributed cache
> ---------------------------------------------------------
>
> Key: KYLIN-2328
> URL: https://issues.apache.org/jira/browse/KYLIN-2328
> Project: Kylin
> Issue Type: Improvement
> Components: Job Engine
> Affects Versions: all
> Reporter: Dayue Gao
> Assignee: Dayue Gao
> Fix For: v2.0.0
>
> Attachments: KYLIN-2328.patch
>
>
> Currently, each MR job uploads all the metadata belonging to a cube to
> distributed cache. When the total size of metadata increases, the submission
> time ("MapReduce Waiting" at Monitor UI) also increases and could become a
> significant problem.
> We could actually optimize the amount of metadata uploaded according to the
> type of job, for example
> * CuboidJob only needs dictionary of the building segment
> * CubeHFileJob doesn't need any dictionary
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