[jira] [Created] (CASSANDRA-19325) [Analytics] Fix range splitting that can produce overlapping ranges

["Yifan Cai (Jira)" <ji...@apache.org>]

Yifan Cai created CASSANDRA-19325:
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             Summary: [Analytics] Fix range splitting that can produce overlapping ranges
                 Key: CASSANDRA-19325
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-19325
             Project: Cassandra
          Issue Type: Bug
            Reporter: Yifan Cai
            Assignee: Yifan Cai


The range splitting implementation can produce the following false results. 

- Given a tiny range, it can produce duplicated ranges, leading to spark executors working on the same data set.
- The produced ranges are closed on both ends, making the same tokens being shared by 2 ranges, leading to data duplication. 

Besides the splitting error, during write process, the split sub-ranges are unordered. It does not seem to affect correctness, but can be confusing.



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