[jira] [Resolved] (CARBONDATA-2304) Enhance compaction performance by enabling prefetch

["Jacky Li (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CARBONDATA-2304?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jacky Li resolved CARBONDATA-2304.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 1.4.0

> Enhance compaction performance by enabling prefetch
> ---------------------------------------------------
>
>                 Key: CARBONDATA-2304
>                 URL: https://issues.apache.org/jira/browse/CARBONDATA-2304
>             Project: CarbonData
>          Issue Type: Improvement
>          Components: data-load
>            Reporter: xuchuanyin
>            Assignee: xuchuanyin
>            Priority: Major
>             Fix For: 1.4.0
>
>          Time Spent: 2h 40m
>  Remaining Estimate: 0h
>
> During compaction, carbondata will query on the segments and retrieve a row， then it will sort the rows and produce the final carbondata file.
> Currently we find the poor performance in retrieving the rows, so adding prefetch for the rows will surely improve the compaction performance.
> In my local tests, compacting 4 segments each with 100 thousand rows costs 30s with prefetch and 50s without prefetch.
> In my tests in a larger cluster, compacting 6 segments each with 18GB raw data costs 45min with prefetch and 57min without prefetch.



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