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From "Sameer Vaishampayan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-899) Support for specifying a timestamp and numVersions on a per-column basis
Date Tue, 21 Aug 2012 20:14:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13439001#comment-13439001
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Sameer Vaishampayan commented on HBASE-899:
-------------------------------------------

@Jonathan, Any update on this bug ? Given that it was supposed to be solved as part of 1249
is it now "closeable" ?
                
> Support for specifying a timestamp and numVersions on a per-column basis
> ------------------------------------------------------------------------
>
>                 Key: HBASE-899
>                 URL: https://issues.apache.org/jira/browse/HBASE-899
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Doğacan Güney
>
> This is just an idea and it may be better to wait after the planned API changes. But
I think it would be useful to support fetching different timestamps and versions for different
columns.
> Example:
> If a row has 2 columns, "col1:" and "col2:" I want to be able to ask for (during scan
or read time, doesn't matter) 2 versions of "col1:" (maybe even between timestamps t1 and
t2) but only 1 version of "col2:". This would be especially handy if during an MR job you
have to read 2 versions of a small column, but do not want the overhead of reading 2 versions
of every other column too....
> (Also, the mechanism is already there. I mean, making the changes to support a per-column
timestamp/numVersions is  ridiculously easy :)

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