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https://issues.apache.org/jira/browse/KYLIN-2929?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Billy Liu resolved KYLIN-2929.
------------------------------
    Resolution: Fixed

Merged at 
https://git1-us-west.apache.org/repos/asf?p=kylin.git;a=commit;h=4a29d92e

> speed up Dump file performance
> ------------------------------
>
>                 Key: KYLIN-2929
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2929
>             Project: Kylin
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: v2.0.0
>            Reporter: fengYu
>            Assignee: fengYu
>            Priority: Major
>              Labels: Performance
>             Fix For: v2.3.0
>
>         Attachments: 
> 0001-KYLIN-2929-speed-up-dump-performance-write-dump-file.patch
>
>
> when I work on KYLIN-2926, I find coprocessor will dump to disk once 
> estimatedMemSize is bigger than spillThreshold, and found that spill data 
> size is extraordinary smaller that estimatedMemSize, in my case dump file 
> size is about 8MB and spillThreshold is setting to 3GB.   
> So, I try to keep the spill data in memory rather than write the file to disk 
> immediately, and when those in-memory spill data reach the threshold, write 
> all spill files together.
> In my case, the coprocessor process cost time drop from 22s to 16s, it is 
> about 30% upgrade。



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