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From "RenZhiMin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KYLIN-3341) SQL queries take up too much memory
Date Tue, 17 Apr 2018 11:17:00 GMT

    [ https://issues.apache.org/jira/browse/KYLIN-3341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440759#comment-16440759
] 

RenZhiMin commented on KYLIN-3341:
----------------------------------

[~Shaofengshi]  please check.

> SQL queries take up too much memory
> -----------------------------------
>
>                 Key: KYLIN-3341
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3341
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Storage - HBase
>    Affects Versions: v2.0.0
>            Reporter: RenZhiMin
>            Priority: Major
>
> Some SQL will take up too much memory in the application, the service is not stable,
after analysis because the SQL query need to scan the relevant segemnt corresponding hbase
table, is through the thread asynchronous request related to SQL cuboid corresponding region.
After each segment makes a request, wait for the data to process the hbase callbacks.
> But sometimes SQL involves more segments, and before all the segments make requests,
there is a large amount of data returned, leading to memory alarm and service instability.



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