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https://issues.apache.org/jira/browse/HBASE-4434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack resolved HBASE-4434.
--------------------------
Resolution: Fixed
Fix Version/s: 0.92.0
Hadoop Flags: [Reviewed]
Committed to 0.92 branch and to TRUNK. Thanks for the sweet patch Kannan.
> seek optimization: don't do eager HFile Scanner next() unless the next KV is
> needed
> -----------------------------------------------------------------------------------
>
> Key: HBASE-4434
> URL: https://issues.apache.org/jira/browse/HBASE-4434
> Project: HBase
> Issue Type: Improvement
> Reporter: Kannan Muthukkaruppan
> Assignee: Kannan Muthukkaruppan
> Fix For: 0.92.0
>
> Attachments: HBASE-4434.txt
>
>
> When a seek/reseek is done on StoreFileScanner, in addition to setting the
> current KV, it also does a HFileScanner level next() ahead of time even if
> the next KV is never actually required. This inefficiency can potentially
> result in additional disk seeks and sub-optimal use of the block cache
> (primarily for cases where the KVs are large and each occupies an HFile block
> of its own).
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