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https://issues.apache.org/jira/browse/HADOOP-19144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-19144.
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Resolution: Won't Fix
> S3A prefetching to support Vector IO
> ------------------------------------
>
> Key: HADOOP-19144
> URL: https://issues.apache.org/jira/browse/HADOOP-19144
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.4.0
> Reporter: Steve Loughran
> Priority: Major
>
> Add explicit support for vector IO in s3a prefetching stream.
> * if a range is in 1+ cached block, it SHALL be read from cache and returned
> * if a range is not in cache : TBD
> * If a range is partially in cache: TBD
> these are the same decisions that abfs has to make: should the client
> fetch/cache block or just do one or more GET requests
> A big issue is: does caching of data fetched in a range request make any
> sense at all? Or more specifically: does fetching the blocks in which range
> requests are found make sense
> Simply going to the store is a lot simpler
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