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From "Shaofeng SHI (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (KYLIN-3635) Percentile calculation on Spark engine is not thread safe
Date Thu, 18 Oct 2018 11:14:00 GMT

     [ https://issues.apache.org/jira/browse/KYLIN-3635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Shaofeng SHI updated KYLIN-3635:
--------------------------------
    Description: As titled; Received reporting that percentile result is wrong when using
Spark engine. Checked the code and found the implementation is not thread safe, the problem
won't happen on normal MR as it is single threaded, but would be problem on Spark.

> Percentile calculation on Spark engine is not thread safe
> ---------------------------------------------------------
>
>                 Key: KYLIN-3635
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3635
>             Project: Kylin
>          Issue Type: Bug
>    Affects Versions: v2.3.0, v2.3.1, v2.4.0, v2.3.2, v2.4.1, v2.5.0
>            Reporter: Shaofeng SHI
>            Priority: Major
>
> As titled; Received reporting that percentile result is wrong when using Spark engine.
Checked the code and found the implementation is not thread safe, the problem won't happen
on normal MR as it is single threaded, but would be problem on Spark.



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