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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-2178) ColumnFamilyRangeIterator
Date Tue, 04 Feb 2014 15:28:12 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-2178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13890765#comment-13890765
] 

Josh Elser commented on ACCUMULO-2178:
--------------------------------------

Definitely, [~sonixbp]. For some set of Ranges, we would want to have some specification of
sequential column ranges that we {{seek()}} to, linearly scan over, then move to the beginning
of that next column in this row.

This is definitely a bit trickier than it sounds, especially when dealing with the sparse
nature of columns in Accumulo. Defining exactly how these column ranges would work up front
would be good and help us do the efficient thing at that tabletserver instead of blindly filtering
every row.

> ColumnFamilyRangeIterator
> -------------------------
>
>                 Key: ACCUMULO-2178
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2178
>             Project: Accumulo
>          Issue Type: Improvement
>            Reporter: Corey J. Nolet
>            Priority: Minor
>
> It would be extremely useful in situations where you would like to specify a range of
rows to iterate and also a range of column families within that range of rows. The current
API requires that you specify a start/end key for each row that you will be scanning in the
range of column families.
> There would be a lot gained from the ability to first seek to the beginning column specified
in the range of columns, return all keys/values inside of that range, and then seek to the
beginning of the range for the following row when the ending column family in the current
row has been reached.



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