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https://issues.apache.org/jira/browse/HBASE-9000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13930909#comment-13930909
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Lars Hofhansl commented on HBASE-9000:
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HBASE-9778 is committed now. It allows a configurable optional look ahead in
ExplicitColumn tracker. Hence it'll do it in both Memstore and StoreScanner. I
did look into doing that in StoreFileScanner, but most of the time of a reseek
is spent before we even get to StoreFileScanner (checking whether we are
forward seeking, checking whether we're still on the same block, seeking every
HFile forward, etc).
> Linear reseek in Memstore
> -------------------------
>
> Key: HBASE-9000
> URL: https://issues.apache.org/jira/browse/HBASE-9000
> Project: HBase
> Issue Type: Improvement
> Components: Performance
> Affects Versions: 0.89-fb
> Reporter: Shane Hogan
> Priority: Minor
> Fix For: 0.89-fb
>
> Attachments: hbase-9000-benchmark-program.patch,
> hbase-9000-port-fb.patch, hbase-9000.patch
>
>
> This is to address the linear reseek in MemStoreScanner. Currently reseek
> iterates over the kvset and the snapshot linearly by just calling next
> repeatedly. The new solution is to do this linear seek up to a configurable
> maximum amount of times then if the seek is not yet complete fall back to
> logarithmic seek.
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