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