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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1517) Implement inexpensive seek operations in HFile
Date Fri, 04 Sep 2009 05:32:57 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12751310#action_12751310
] 

Jonathan Gray commented on HBASE-1517:
--------------------------------------

Let's leave it in for now.  This may not be that hard and there's a bunch of simple but useful
optimizations that this will unlock.

> Implement inexpensive seek operations in HFile
> ----------------------------------------------
>
>                 Key: HBASE-1517
>                 URL: https://issues.apache.org/jira/browse/HBASE-1517
>             Project: Hadoop HBase
>          Issue Type: Improvement
>    Affects Versions: 0.20.0
>            Reporter: Jonathan Gray
>             Fix For: 0.20.1
>
>
> When we early-out of a row because of columns, versions, filters, etc... we seek to the
end of that row one key at a time.  We should do the seek at the HFile level in cases where
we would end up skipping blocks in the process.  This will be very common in cases with relatively
large rows and regex row filters.
> If calls that end up doing nothing are constant time, we could also call this to seek
to the next column (or even a specific column in ExplicitTracker case).

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