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From "Jaume M (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-20853) Expose ShuffleHandler.registerDag in the llap daemon API
Date Thu, 01 Nov 2018 17:19:01 GMT

     [ https://issues.apache.org/jira/browse/HIVE-20853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jaume M reassigned HIVE-20853:
------------------------------

    Assignee: Jaume M

> Expose ShuffleHandler.registerDag in the llap daemon API
> --------------------------------------------------------
>
>                 Key: HIVE-20853
>                 URL: https://issues.apache.org/jira/browse/HIVE-20853
>             Project: Hive
>          Issue Type: Improvement
>          Components: llap
>    Affects Versions: 3.1.0
>            Reporter: Jaume M
>            Assignee: Jaume M
>            Priority: Critical
>
> Currently DAGs are only registered when a submitWork is called for that DAG. At this
point the crendentials are added to the ShuffleHandler and it can start serving.
> However Tez might (and will) schedule tasks to fetch from the ShuffleHandler before anything
of this happens and all this tasks will fail which may results in the query failing.
> This happens in the scenario in which a LlapDaemon just comes up and tez fetchers try
to open a connection before a DAG has been registered.
> Adding this API will allow to register the DAG against the Daemon when the AM notices
that a new Daemon is up.



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