[jira] [Resolved] (TEZ-933) Race in getting source / destination numTasks on an Edge

["Siddharth Seth (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TEZ-933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Siddharth Seth resolved TEZ-933.
--------------------------------

       Resolution: Fixed
    Fix Version/s: 0.4.0

Thanks for the quick review. Committing. WIll create a separate jira to follow up on other potential changes required.

> Race in getting source / destination numTasks on an Edge
> --------------------------------------------------------
>
>                 Key: TEZ-933
>                 URL: https://issues.apache.org/jira/browse/TEZ-933
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>             Fix For: 0.4.0
>
>         Attachments: TEZ-933.1.txt
>
>
> Edges rely on getting properties (specifically numTasks in this case) from the source or destination vertex.
> This can end up with an incorrect value being used depending on the state of the vertex - whether the vertex has been initialized, whether the parallelism has been changed etc.
> As an example
> {code}
> edgeManager.getNumSourceTaskPhysicalOutputs(destinationVertex.getTotalTasks(), sourceTaskIndex))
> {code}
> destinationVertex.getTotalTasks() may be incorrect if the destinationVertex hasn't yet been initialized. Alternately, this value can change based on setParallelism calls.



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