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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-1125) Filter out ColumnFamily rows that aren't part of the query
Date Fri, 01 Jul 2011 23:17:28 GMT


Jonathan Ellis updated CASSANDRA-1125:

    Attachment: 1125-formatted.txt

Looks good to me for the most part.  (Attaching reformatted version.)

One part though I'm not 100% sure about -- we're using KeyRange for start-exclusive ranges,
when the Thrift API always uses it for start-inclusive.

I'd be more comfortable with any of:
- using a Pair<String, String>
- using a new one-off class
- using KeyRange but with tokens (which Thrift also uses for start-exclusive)
- using a Range object directly (also requires tokens)

> Filter out ColumnFamily rows that aren't part of the query
> ----------------------------------------------------------
>                 Key: CASSANDRA-1125
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Hadoop
>            Reporter: Jeremy Hanna
>            Assignee: Mck SembWever
>            Priority: Minor
>             Fix For: 1.0
>         Attachments: 1125-formatted.txt, CASSANDRA-1125.patch
> Currently, when running a MapReduce job against data in a Cassandra data store, it reads
through all the data for a particular ColumnFamily.  This could be optimized to only read
through those rows that have to do with the query.
> It's a small change but wanted to put it in Jira so that it didn't fall through the cracks.

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