[jira] [Comment Edited] (REEF-1335) Create State Machine for IMRU fault tolerance

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

    [ https://issues.apache.org/jira/browse/REEF-1335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15248949#comment-15248949 ] 

Markus Weimer edited comment on REEF-1335 at 4/19/16 11:47 PM:
---------------------------------------------------------------

Yes. We have to be very careful to scope the {{lock()}} blocks carefully.


was (Author: markus.weimer):
Yes. We have to be very careful to scope the {{lock(){...}}} blocks carefully.

> Create State Machine for IMRU fault tolerance
> ---------------------------------------------
>
>                 Key: REEF-1335
>                 URL: https://issues.apache.org/jira/browse/REEF-1335
>             Project: REEF
>          Issue Type: Task
>          Components: IMRU, REEF.NET
>            Reporter: Julia
>            Assignee: Julia
>              Labels: FT
>         Attachments: REEF Fault Tolerant Technical design.docx
>
>
> To Support fault tolerant, we would like to use state machine to control the system state transitions.  
> After driver is created, it will start from request evaluators and submit contexts state; after all the contexts are ready, it will move to submitting tasks state; when all the tasks are start running, it moves to tasks running state; when all the tasks are completed, the state will be changed to tasks completed. If either tasks or evaluators fail, it will change to shut down state, etc. 
> Here are the proposed system states:
> * WaitingForEvaluator,
> * SubmitingTasks,
> * TasksRunning,
> * TasksCompleted,
> * ShutingDown,
> * Fail
> Here are the event that may trigger the state change:
> * AllContextsAreReady,
> * AllTasksAreRunning,
> * AllTasksAreCompleted,
> * FailedTask,
> * FailedEvaluator,
> * NotRecoverable,
> * Recover



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