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https://issues.apache.org/jira/browse/TEZ-678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13877128#comment-13877128
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Bikas Saha commented on TEZ-678:
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Uploaded patch with support for single commit of shared outputs. Reviews
welcome.
> Support for union operations
> ----------------------------
>
> Key: TEZ-678
> URL: https://issues.apache.org/jira/browse/TEZ-678
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Bikas Saha
> Assignee: Bikas Saha
> Attachments: TEZ-678.1.patch, TEZ-678.2.patch, TEZ-678.3.patch,
> TEZ-678.4.patch, TEZ-678.5.patch
>
>
> Unions represent a collection of results obtained from different branches of
> computation. The collection is a virtual operation that does not need to
> execute any tasks. Subsequent operations can conveniently work on the union
> named data set instead of each individual member of the union. While unions
> can be implemented efficiently without additional support from Tez, having
> API support can make it easier and less error-prone to implement.
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