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https://issues.apache.org/jira/browse/HBASE-6874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490898#comment-13490898
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Karthik Ranganathan commented on HBASE-6874:
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Awesome, then layering in multi-pre-fetch should be very easy!
                
> Implement prefetching for scanners
> ----------------------------------
>
>                 Key: HBASE-6874
>                 URL: https://issues.apache.org/jira/browse/HBASE-6874
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Karthik Ranganathan
>            Assignee: Karthik Ranganathan
>
> I did some quick experiments by scanning data that should be completely in 
> memory and found that adding pre-fetching increases the throughput by about 
> 50% from 26MB/s to 39MB/s.
> The idea is to perform the next in a background thread, and keep the result 
> ready. When the scanner's next comes in, return the pre-computed result and 
> issue another background read.

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