[jira] [Assigned] (TEZ-1967) Add a monitoring API on DAGClient which returns after a time interval or on DAG state change

["Vasanth kumar RJ (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TEZ-1967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vasanth kumar RJ reassigned TEZ-1967:
-------------------------------------

    Assignee: Vasanth kumar RJ

> Add a monitoring API on DAGClient which returns after a time interval or on DAG state change
> --------------------------------------------------------------------------------------------
>
>                 Key: TEZ-1967
>                 URL: https://issues.apache.org/jira/browse/TEZ-1967
>             Project: Apache Tez
>          Issue Type: Improvement
>            Reporter: Siddharth Seth
>            Assignee: Vasanth kumar RJ
>         Attachments: TEZ-1967.1.patch
>
>
> To monitor a running DAG, clients end up using DAGClient.getDAGSstatus in a loop with a poll interval.
> In the worst case, they find out about DAG completion, failure etc only after the poll interval.
> Instead, an API can be added which waits on the AM for a specified interval, but can return earlier if the DAG state changes.
> This will end up blocking RPC handlers - but that isn't a problem since we don't have many entities querying for DAG status.



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