[jira] [Updated] (TEZ-1075) 0 vertex dags should succeed

["Hitesh Shah (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TEZ-1075?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hitesh Shah updated TEZ-1075:
-----------------------------
    Target Version/s:   (was: 0.6.0)

> 0 vertex dags should succeed
> ----------------------------
>
>                 Key: TEZ-1075
>                 URL: https://issues.apache.org/jira/browse/TEZ-1075
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Bikas Saha
>            Assignee: Chen He
>              Labels: newbie++
>         Attachments: TEZ-1075-v2.patch, TEZ-1075.patch
>
>
> Currently 0 vertex dags fail because of the following code in DAGImpl
> {code}    if (numVertices == 0) {
>       addDiagnostic("No vertices for dag");
>       trySetTerminationCause(DAGTerminationCause.ZERO_VERTICES);
>       if (event != null) {
>         return DAGState.FAILED;
>       }
>       return finished(DAGState.FAILED);
>     }
> {code}
> IMO a 0 vertex DAG is a legitimate construct and should just pass. Similar to a 0 task vertex. Its essentially a no-op operation.



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