[jira] [Commented] (SQOOP-2811) Sqoop2: Extracting sequence files may result in duplicates

["ASF subversion and git services (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SQOOP-2811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15126820#comment-15126820 ] 

ASF subversion and git services commented on SQOOP-2811:
--------------------------------------------------------

Commit 118aa7c4f9cb7ed3a81ce792e7bf56d31f9107e5 in sqoop's branch refs/heads/sqoop2 from [~jarcec]
[ https://git-wip-us.apache.org/repos/asf?p=sqoop.git;h=118aa7c ]

SQOOP-2811: Sqoop2: Extracting sequence files may result in duplicates

(Abraham Fine via Jarek Jarcec Cecho)


> Sqoop2: Extracting sequence files may result in duplicates
> ----------------------------------------------------------
>
>                 Key: SQOOP-2811
>                 URL: https://issues.apache.org/jira/browse/SQOOP-2811
>             Project: Sqoop
>          Issue Type: Bug
>    Affects Versions: 1.99.6
>            Reporter: Abraham Fine
>            Assignee: Abraham Fine
>             Fix For: 1.99.7
>
>         Attachments: SQOOP-2811.patch
>
>
> In the hdfs extractor we use:
> {code:java}
>     if (start > filereader.getPosition()) {
>       filereader.sync(start); // sync to start
>     }
> {code}
> to jump to the correct point in the sequence file that we want to extract.
> If the sequence file is small, multiple start points may `sync` to the same point and we could end up extracting the same record multiple times.



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