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From Ted Yu <yuzhih...@gmail.com>
Subject Re: How HBase perform per-column scan?
Date Sun, 10 Mar 2013 14:01:16 GMT
Hi, Yun:
Take a look at HBASE-5416 (Improve performance of scans with some kind of
filters) which is in 0.94.5 release.

In your case, you can use a filter which specifies column C as the
essential family.
Here I interpret column C as column family.


On Sat, Mar 9, 2013 at 11:11 AM, yun peng <pengyunmomo@gmail.com> wrote:

> Hi, All,
> I want to find all existing values for a given column in a HBase, and would
> that result in a full-table scan in HBase? For example, given a column C,
> the table is of very large number of rows, from which few rows (say only 1
> row) have non-empty values for column C. Would HBase still ues a full table
> scan to find this row? Or HBase has any optimization work for this kind of
> query?
> Thanks...
> Regards
> Yun

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