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https://issues.apache.org/jira/browse/SQOOP-788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13535438#comment-13535438
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Hari Shreedharan commented on SQOOP-788:
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The issue would affect export as well, since objects are reused there too.
                
> Sqoop2: Import sometimes duplicate some data
> --------------------------------------------
>
>                 Key: SQOOP-788
>                 URL: https://issues.apache.org/jira/browse/SQOOP-788
>             Project: Sqoop
>          Issue Type: Bug
>            Reporter: Jarek Jarcec Cecho
>            Priority: Blocker
>             Fix For: 1.99.1
>
>
> I've noticed that on my unique testing set of 408957 rows, import always 
> imports 408957 rows. However when I check number of unique lines I usually 
> got smaller number - for example 408056 (less by 901). 
> Because total number of rows fits, I'm expecting that we sometimes read one 
> value twice somehow. I'm not quite sure why.

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