[jira] [Commented] (KYLIN-2436) add a configuration knob to disable spilling of aggregation cache

["hongbin ma (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KYLIN-2436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15858057#comment-15858057 ] 

hongbin ma commented on KYLIN-2436:
-----------------------------------

+1

> add a configuration knob to disable spilling of aggregation cache
> -----------------------------------------------------------------
>
>                 Key: KYLIN-2436
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2436
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Storage - HBase
>    Affects Versions: v1.6.0
>            Reporter: Dayue Gao
>            Assignee: Dayue Gao
>
> Kylin's aggregation operator can spill intermediate results to disk when its estimated memory usage exceeds some threshold (kylin.query.coprocessor.mem.gb to be specific). While it's a useful feature in general to prevent RegionServer from OOM, there are times when aborting this kind of memory-hungry query immediately is a more suitable choice to users.
> To accommodate this requirement, I suggest adding a new configuration named *kylin.storage.hbase.coprocessor-spill-enabled*. The default value would be true, which will keep the same behavior as before. If changed to false, query that uses more aggregation memory than threshold will fail immediately.



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