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From "Andrew Chung (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (REEF-1415) Deprecate JavaTaskException and set AsError to null on FailedTask for FailedEvaluators
Date Fri, 03 Jun 2016 16:49:59 GMT

    [ https://issues.apache.org/jira/browse/REEF-1415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15314395#comment-15314395
] 

Andrew Chung commented on REEF-1415:
------------------------------------

This sounds good.

> Deprecate JavaTaskException and set AsError to null on FailedTask for FailedEvaluators
> --------------------------------------------------------------------------------------
>
>                 Key: REEF-1415
>                 URL: https://issues.apache.org/jira/browse/REEF-1415
>             Project: REEF
>          Issue Type: Bug
>          Components: REEF.NET, REEF.NET Driver
>            Reporter: Andrew Chung
>            Assignee: Andrew Chung
>
> Non-existent Task Exceptions can occur when an Evaluator fails unexpectedly. The Task
itself does not throw an Exception, so the FailedTask therefore should not contain an Exception
object.
> Java Task Exceptions are currently generated when {{AvroFailedTask.Data}} is set to a
{{null}} byte array. Provided that the Avro schema of FailedTask does not union with {{null}},
this will never occur.
> Now that C# Task Exceptions support serialization such that even when a user's Exception
is not serializable we wrap a {{NonSerializableTaskException}} around it, we can assume that
an empty {{AvroFailedTask.Data}} only occurs when the Evaluator fails. We should thus return
{{null}} when the user calls {{AsError()}} on a {{FailedTask}} that comes from a {{FailedEvaluator}}.



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