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From "Jonathan Ellis (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4136) get_paged_slices doesn't reset startColumn after first row
Date Tue, 10 Apr 2012 21:17:20 GMT
get_paged_slices doesn't reset startColumn after first row
----------------------------------------------------------

                 Key: CASSANDRA-4136
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4136
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.1.0
            Reporter: Jonathan Ellis
            Assignee: Sylvain Lebresne
            Priority: Critical
             Fix For: 1.1.0


As an example, consider the WordCount example (see CASSANDRA-3883).  WordCountSetup inserts
1000 rows, each with three columns: text3, text4, int1.  (Some other miscellaneous columns
are inserted in a few rows, but we can ignore them here.)

Paging through with get_paged_slice calls with a count of 99, CFRecordReader will first retrieve
33 rows, the last of which we will call K.  Then it will attempt to fetch 99 more columns,
starting with row K column text4.

The bug is that it will only fetch text4 for *each* subsequent row K+i, instead of returning
(K, text4), (K+1, int1), (K+1, int3), (K+1, text4), etc.

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