[jira] [Commented] (TEZ-394) Better scheduling for uneven DAGs

["Rohini Palaniswamy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TEZ-394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15861837#comment-15861837 ] 

Rohini Palaniswamy commented on TEZ-394:
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bq. With the above case, even though RootV2 is at priority 3) if there is free capacity while RootV1 is being run, then tasks of RootV2 should also be run at the same time.
  [~jlowe], will this work or RootV2 will only be run after IntermediateV1 is run?

> Better scheduling for uneven DAGs
> ---------------------------------
>
>                 Key: TEZ-394
>                 URL: https://issues.apache.org/jira/browse/TEZ-394
>             Project: Apache Tez
>          Issue Type: Sub-task
>            Reporter: Rohini Palaniswamy
>            Assignee: Jason Lowe
>         Attachments: TEZ-394.001.patch
>
>
>   Consider a series of joins or group by on dataset A with few datasets that takes 10 hours followed by a final join with a dataset X. The vertex that loads dataset X will be one of the top vertexes and initialized early even though its output is not consumed till the end after 10 hours. 
> 1) Could either use delayed start logic for better resource allocation
> 2) Else if they are started upfront, need to handle failure/recovery cases where the nodes which executed the MapTask might have gone down when the final join happens. 



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