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Posted to dev@hbase.apache.org by "Jimmy Xiang (JIRA)" <ji...@apache.org> on 2013/04/25 20:04:18 UTC
[jira] [Resolved] (HBASE-6874) Implement prefetching for scanners
[ https://issues.apache.org/jira/browse/HBASE-6874?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jimmy Xiang resolved HBASE-6874.
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Resolution: Fixed
Fix Version/s: 0.89-fb
> 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
> Fix For: 0.89-fb
>
>
> 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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