[jira] [Commented] (CASSANDRA-2904) get_range_slices with no columns could be made faster by scanning the index file

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-2904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497629#comment-13497629 ] 

Jonathan Ellis commented on CASSANDRA-2904:
-------------------------------------------

Superseded by CASSANDRA-4536
                
> get_range_slices with no columns could be made faster by scanning the index file
> --------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-2904
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2904
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jean-Francois Im
>            Priority: Minor
>         Attachments: CASSANDRA-2904-v1.diff
>
>
> When scanning a column family using get_range_slices() and a predicate that contains no columns, the scan operates on the actual data, not the index file.
> Our use case for this is that we have a column family that has relatively wide rows(varying from 10kb to over 100kb of data per row) and we need to do iterate through all the keys to figure out which rows we are interested in; obviously, going through the index file than the data is faster in this case(in the order of minutes versus hours).

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