[jira] [Resolved] (REEF-1251) IMRU Driver handlers for Fault Tolerant

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

     [ https://issues.apache.org/jira/browse/REEF-1251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julia resolved REEF-1251.
-------------------------
       Resolution: Fixed
    Fix Version/s: 0.16

Resolved via https://github.com/apache/reef/pull/1087

> IMRU Driver handlers for Fault Tolerant
> ---------------------------------------
>
>                 Key: REEF-1251
>                 URL: https://issues.apache.org/jira/browse/REEF-1251
>             Project: REEF
>          Issue Type: Task
>          Components: REEF.NET, REEF.NET Evaluator
>            Reporter: Julia
>            Assignee: Julia
>              Labels: FT
>             Fix For: 0.16
>
>
> Handles communications between driver and evaluators for evaluator and task recovery when some evaluators fail. The following describe a flow for an example:
> Here is the control flow in normal scenario:
> a.	All the task, context and task status information is maintained in Task Manager when tasks are created at the first time
> b.	Task1, task2, Task3 s are queued in Task Starter 
> c.	When all tasks in a group is ready, tasks are submitted
> d.	When tasks start running, task status is updated in Task Manager
> e.	Evaluator 3 failed 
> f.	Driver received failed evaluator event and report it to Evaluator Manager
> g.	Task Manager update task status to set task3 as failed
> h.	Driver send message to task1 and task2 to stop them and update task status in Task Manager
> i.	Driver request a new evaluator3’ for failed evaluator and submit a new context3’ for it and add a new task3’ to the queue
> j.	Driver recreate task1’ and task2’ with existing context1 and context2 add them to the queue
> k.	When all the new tasks in the communication group are ready, start tasks as in step c.



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