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https://issues.apache.org/jira/browse/TEZ-1376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14104768#comment-14104768
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Siddharth Seth commented on TEZ-1376:
-------------------------------------
If someone is trying to execute two concurrent DAGs, both of which write to the
same output path - that's not going to work, neither in local mode, nor on a
regular cluster.
In terms of local files etc - most of the Tez data is written to a staging dir
per DAG. I don't think anything is written out to a common location - so that
should not be a concern either - unless there's a possibility of two dags using
the same staging dir (determined by timestamp I believe).
> Support independent parallel DAGs execution in Local Mode
> ---------------------------------------------------------
>
> Key: TEZ-1376
> URL: https://issues.apache.org/jira/browse/TEZ-1376
> Project: Apache Tez
> Issue Type: Sub-task
> Affects Versions: 0.4.1
> Reporter: Chen He
> Attachments: simpleTestCase.patch
>
>
> Pig on Tez allows user to submit parallel DAGs in a single pig script. Those
> DAGs could be independent and concurrent. Current LocalMode may encounter
> some problems when concurrent parallel DAGs are submitted.
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