[jira] [Assigned] (REEF-1492) On IMRU recovery: if ResultHandler.Dispose() throws exception, IMRU Driver hangs.

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

     [ https://issues.apache.org/jira/browse/REEF-1492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julia reassigned REEF-1492:
---------------------------

    Assignee: Julia

> On IMRU recovery: if ResultHandler.Dispose() throws exception, IMRU Driver hangs.
> ---------------------------------------------------------------------------------
>
>                 Key: REEF-1492
>                 URL: https://issues.apache.org/jira/browse/REEF-1492
>             Project: REEF
>          Issue Type: Bug
>          Components: REEF
>            Reporter: Andrey
>            Assignee: Julia
>              Labels: FT
>
> IMRU scenario:
> - one of the map tasks fails
> - Driver triggers shutdown on all tasks 
> - UpdateTaskHost on shutdown is calling ResultHandler.Dispose()
> - resulthandler (in my case WriteResultHandler) throws exeption because there are no results (Update function was never executed)
> There are couple questions here:
> - WriteResulthandler should handle [no results] situation more gracefully,  especially on Dispose() 
> Probably logic of copy file should be moved from Dispose() to HandleResult() function.
> - UpdateTaskHost should handle exceptions from Dispose() call....result handler can be provided by client, so code can throw.
> In case of Dispose() failure the UpdateTaskHost should probably trigger non-recoverable failure, which in turn triggers Driver failure  (right now driver  hangs)



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