[jira] [Resolved] (REEF-1691) Should not request extra evaluators if evaluator failed at WatingForEvaluator state

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

     [ https://issues.apache.org/jira/browse/REEF-1691?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mariia Mykhailova resolved REEF-1691.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 0.16

Resolved via [PR 1210|https://github.com/apache/reef/pull/1210]

> Should not request extra evaluators if evaluator failed at WatingForEvaluator state
> -----------------------------------------------------------------------------------
>
>                 Key: REEF-1691
>                 URL: https://issues.apache.org/jira/browse/REEF-1691
>             Project: REEF
>          Issue Type: Bug
>            Reporter: Julia
>            Assignee: Julia
>              Labels: FT
>             Fix For: 0.16
>
>
> When Evaluators fail at both WatingForEvalautor state and TaskRunningState, in recovery, we use _failedEvaluatorsCount to request new Evaluators. That number includes the failed Evaluators in both states, while we have requested the new Evaluators for failed Evaluators at WatingForEvalautor state. This causes additional Evaluators are requested. It is a regression caused by REEF-1677.
> With REEF-1688, even we loose the condition to ignore the additional Evaluators added, the additional allocated Evaluator can be received in other state because we change the system state right after we got all the Evaluators needed. When we receive additional Allocated Evaluators in other unexpected state, it will result in IMRUSystemException. 
> The fix is to only request Evaluators failed during/after task submitting in recovery. 



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