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Posted to issues@kudu.apache.org by "Mike Percy (JIRA)" <ji...@apache.org> on 2019/02/09 07:33:00 UTC

[jira] [Updated] (KUDU-2645) Diff scanner should perform a merge on the rowset iterators at scan time

     [ https://issues.apache.org/jira/browse/KUDU-2645?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mike Percy updated KUDU-2645:
-----------------------------
    Status: In Review  (was: In Progress)

> Diff scanner should perform a merge on the rowset iterators at scan time
> ------------------------------------------------------------------------
>
>                 Key: KUDU-2645
>                 URL: https://issues.apache.org/jira/browse/KUDU-2645
>             Project: Kudu
>          Issue Type: New Feature
>          Components: tablet
>            Reporter: Mike Percy
>            Assignee: Mike Percy
>            Priority: Major
>
> In order to perform a diff scan we will need the MergeIterator to ensure that duplicate ghost rows are not returned in cases where a row was deleted and flushed, then reinserted into a new rowset during the time period covered by the diff scan. In such a case, only one representation of the row should be returned, which is the reinserted one.



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