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https://issues.apache.org/jira/browse/CASSANDRA-2855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13148007#comment-13148007
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Hudson commented on CASSANDRA-2855:
-----------------------------------
Integrated in Cassandra-0.8 #398 (See
[https://builds.apache.org/job/Cassandra-0.8/398/])
Skip empty rows when entire row is requested, redux.
Patch by tjake, reviewed by brandonwilliams for CASSANDRA-2855
brandonwilliams :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1200471
Files :
* /cassandra/branches/cassandra-0.8/CHANGES.txt
*
/cassandra/branches/cassandra-0.8/src/java/org/apache/cassandra/hadoop/ColumnFamilyRecordReader.java
> Skip rows with empty columns when slicing entire row
> ----------------------------------------------------
>
> Key: CASSANDRA-2855
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2855
> Project: Cassandra
> Issue Type: Improvement
> Components: API
> Reporter: Jeremy Hanna
> Assignee: T Jake Luciani
> Priority: Minor
> Labels: hadoop
> Fix For: 0.8.8
>
> Attachments: 2855-v2.txt, 2855-v3.txt, 2855-v4.txt, 2855-v5.txt,
> v1-0001-CASSANDRA-2855-ignore-ghosts-when-no-predicate-specifi.txt
>
>
> We have been finding that range ghosts appear in results from Hadoop via Pig.
> This could also happen if rows don't have data for the slice predicate that
> is given. This leads to having to do a painful amount of defensive checking
> on the Pig side, especially in the case of range ghosts.
> We would like to add an option to skip rows that have no column values in it.
> That functionality existed before in core Cassandra but was removed because
> of the performance penalty of that checking. However with Hadoop support in
> the RecordReader, that is batch oriented anyway, so individual row reading
> performance isn't as much of an issue. Also we would make it an optional
> config parameter for each job anyway, so people wouldn't have to incur that
> penalty if they are confident that there won't be those empty rows or they
> don't care.
> It could be parameter cassandra.skip.empty.rows and be true/false.
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