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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4256) Intra-row scanning (part deux)
Date Tue, 15 Nov 2011 00:00:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150091#comment-13150091

Lars Hofhansl commented on HBASE-4256:

What about the other points? Are we seeing this as:
1. A way to scan subset of many rows (would be inefficient as we need to reseek at the beginning
of every new row)?
2. A scan strictly within a single row? (should enforce start/endRow set to the same value
in this case.)
3. More control where to start and stop a scan? (leave the scan logic mostly the way it is,
and allow a way to seek to a column of a row, and end at a different column in another row).

#1 makes no sense (to me anyway, but maybe there's something I didn't see).
#3 is a superset of #2. As described above, in this case we could start at RowX:QualA and
scan to RowY:QualB, all rows between RowX and RowY would scan all Quals. Can be combined easily
with timerange scans.

I'd be in favor of #3. Or #2 if it turns out to be less work.

> Intra-row scanning (part deux)
> ------------------------------
>                 Key: HBASE-4256
>                 URL: https://issues.apache.org/jira/browse/HBASE-4256
>             Project: HBase
>          Issue Type: New Feature
>    Affects Versions: 0.90.4
>            Reporter: Jean-Daniel Cryans
>            Assignee: Dave Revell
>            Priority: Critical
>             Fix For: 0.94.0
> Dave Revell was asking on IRC today if there's a way to scan ranges of *qualifiers* within
a row. That is, to be able to specify a *start qualifier* and an *end qualifier* so that the
Get or Scan seeks directly to the first qualifier and stops at some point which can be predeterminate
by a qualifier or simply a batch configuration (already exists).
> This is particularly useful for large rows with time-based qualifiers.
> Dave also mentioned that another popular database has such a feature that they call "column

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