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https://issues.apache.org/jira/browse/MAPREDUCE-1368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12798821#action_12798821
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Omer Trajman commented on MAPREDUCE-1368:
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This is just in the outputformatter - is there any case that the
outputformatter would get repeated records from map or reduce and get the close
call? i.e. after hadoop calls close on an outputformatter would it still
potentially re-send the output data?
> Vertica adapter doesn't use explicity transactions or report progress
> ---------------------------------------------------------------------
>
> Key: MAPREDUCE-1368
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1368
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.21.0
> Reporter: Omer Trajman
> Assignee: Omer Trajman
> Fix For: 0.21.0
>
>
> The vertica adapter doesn't use explicit transactions, so speculative tasks
> can result in duplicate loads. The JDBC driver supports it so the fix is
> pretty minor. Also the JDBC driver commits synchronously and the adapter
> needs to report progress even if it takes longer than the timeout.
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