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From "Zhong Yanghong (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (KYLIN-2986) Improve the way of parallel segment building
Date Tue, 07 Nov 2017 06:24:00 GMT

     [ https://issues.apache.org/jira/browse/KYLIN-2986?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhong Yanghong reassigned KYLIN-2986:
-------------------------------------

    Assignee: Zhong Yanghong  (was: Wang, Gang)

> Improve the way of parallel segment building
> --------------------------------------------
>
>                 Key: KYLIN-2986
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2986
>             Project: Kylin
>          Issue Type: Improvement
>            Reporter: Zhong Yanghong
>            Assignee: Zhong Yanghong
>            Priority: Trivial
>
> Currently parallel segment building is allowed. However, there's few constraints, which
may lead to several issues. For example:
> # Two jobs for the same time range is triggered simultaneously, which is meaningless.
> # There's overlap between segments to be build by parallel jobs
> To avoid these issues, we should follow three rule checking:
> # A new segment for a job should not have overlap with existing new segment
> # A new segment for a job can have overlap with existing ready segments. However, it
should cover them and its relative complement should be empty



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